SOHO-LASCO Comet Reports for 200108

There is a weak possible object near by the comet SOHO-328.

Difference in coordinates 16-17 pixels. Orbits identical. Possible general parental body.

Object not obvious. Found under machine processing (Program A. Mimeev @ F. Mimeev) the vicinities of comet SOHO-328.

Brightness is sailled decreases and seen on 6 consequent images. 

(On the last frame an object in the manner of the single pixel already).

Difficult seen at cartoon in view of small contrast.

Better visible when considering a separate images under greater increase.

Heavy object for identifications.

For the comparison (parenthetically) coordinates of known comet.

(Possible I mistaken in interpreting a nature of object...

But this on computer conscience already.

These coordinates to to me computer gave...)



20010613, 1024?1024, 0?0 bottom/left, telescope ?2.



Time    X   Y      (Time     X   Y)  Difference



1254  980  76

1331  976  98      (1331   975  81)  top 17 pixel (98-81)

1354  974 112      (1354   973  95)  top 17 pixel

1406  972 119      (1406   972 102)  top 17 pixel

1430  970 133      (1430   970 117)  top 16 pixel

1508  966 156      (1508   966 140)  top 16 pixel



Yurij Davydov

Hi,

	Just a quick note.  The LASCO doors will finally be

opened tomorrow (Thursday).  Also, I'm out of the office from

Aug 2 - 8, back on the 9th.



Doug

I am unable to confirm any object at the locations provided by Y.

Davydov.  The points indicated all appear to be at the level of the

noise in the data.



Doug

Possible comet in real-time C3 images B/W.



Positions 512x512 (0,0) top-left corner





2001/08/03 08:42 (317,353)

2001/08/03 09:42 (313,349)

2001/08/03 10:23 (312,346)

2001/08/03 12:42 (308,330)





Comment: the positions are approximate and the time gap of

the images is due to the not continue download of the B/W images.

The object is brigth and move toward the Sun on an apparent 

Kreutz orbit.



Regards,



Toni Scarmato 

I cannot confirm the report of T. Scarmato. I see only cosmic ray

hits and background noise at the indicated positions.





Derek

Possible comet in C2 images:



Positions 512x152 (0,0) top-left corner



2001/08/03 01:54 (474,442)

2001/08/03 02:06 (468,435)

2001/08/03 02:30 (457,420)



Comment: unfortunately, the previous image is at 00:54 and

the next at 03:57. So, is not possible to verify.

The motion is on a Kreutz orbit.





Regards,



Toni Scarmato

Hi Derek.



Regarding the C3 report I am in agreement with you.





For C2 report we have an X shift of 6 pixels and

Y shift of 7 pixels in 12 minutes between 01:54 and 02:06.

This mean that, if the motion is regular, at 00:54

the position of the object is (504,477), out of the C2 FOV.



Also, at 03:57 we have the position (413,371). At this 

position in 512 pixels images I see a diffuse object, but

I am not sure on this.



Regards,



Toni Scarmato

Regarding Toni's C2 report I am unable to confirm it using 1024

resolution images.



Regards, Sebastian

Derek,



I Have download now the 3 C2 images at 1024 pixels.

The object is well visible at positions:



2001/08/03 01:54 (946,884)

2001/08/03 02:06 (937,871)

2001/08/03 02:30 (916,838)



On images at 03:57 is not visible.  Also, I Have 

a doubt on the shape of the object.



Regards,



Toni

Toni, I do not see anything cometary for the 8/3/01 C2 positions

you give. Also, the positions do not interpolate very well and 

the object should indeed be visible at 0:54 (991,75) when 

extrapolating back via your first 2 positions.





Derek

Possible brigth comet in C3 real-time images



Positions 512x512 (0,0) top-left corner



2001/08/05 00:42 (402,418)?

2001/08/05 01:42 (400,400)

2001/08/05 02:18 (398,388)

2001/08/05 02:42 (396,382)





Comment: the object is well visible in 512 pixels images, 

but the shift in Y axis seem too high.

I am wating other images to confirm.



Regards,



Toni Scarmato

Possible comet in C2 images strting at position



512x512 (0,0) top-left corner





2001/08/05 03:54 (491,395)





Other positions at next post





Toni Scarmato

Update C2 report:





positions 512x512 (0,0) top-left corner



2001/08/05 04:06 (485,392)

2001/08/05 04:30 (472,385)





Comment: object moving on a Kreutz orbit toward the Sun.

The shape and brigthness not change in random way.

Seem just a comet.

At this moment the server not responding to download

other images.





Regards,



Toni Scarmato

I can confirm my last report.



The comet continue to be visible on other images.



At next post I will give other positions.



Toni

Update C2 report.





All positions 512x512 (0,0) top-left corner



2001/08/05 03:54 (491,395)

2001/08/05 04:06 (485,392)

2001/08/05 04:30 (472,385)

2001/08/05 04:54 (460,380)

2001/08/05 05:06 (453,376)

2001/08/05 05:30 (440,368)

2001/08/05 05:54 (426,362)





Comment: comet well visible on 7 consecutive images, 

no tail visible.





Regards,



Toni Scarmato

Can confirm Toni's condensed object.

Kazimieras

Possible sungrazer in C3 images - 20010805_2142 UT



****** NOTE ******

x-coordinates are probably correct, 

but y-coordinates may be off by

several pixels.





0,477 in lower left corner



                  LASCO C3 IMAGES

     

Date & UT            Size         X and Y 

of Images            used       Coordinates       

--------------------------------------------

20010805_2142.gif  512 x 512    350, 270      

20010805_2218.gif  512 x 512    349, 269

20010805_2318.gif  512 x 512    347, 268

20010806_0018.gif  512 x 512    345, 267 



Michael Boschat

I can confirm the recent report by T. Scarmato of a sungrazer in

C2 on 8/5/01.  The object is also visible in a handful of C3 

images. Rough positions are below............



# HEIGHT   DATE     TIME   ANGLE  TEL  FC    COL     ROW

 10.32 2001/08/04 23:18:13 242.0   C3  10   676.0   447.0

 10.01 2001/08/04 23:42:32 241.8   C3  10   671.0   449.0

  9.54 2001/08/05 00:18:05 241.9   C3  10   664.0   453.0

  8.43 2001/08/05 01:42:06 241.9   C3  10   647.0   462.0

  7.94 2001/08/05 02:18:05 241.4   C3  10   639.0   465.0

  7.60 2001/08/05 02:42:05 241.5   C3  10   634.0   468.0

  6.67 2001/08/05 03:54:05 239.8   C2  10   982.0   232.0

  6.50 2001/08/05 04:06:05 239.6   C2  10   969.0   238.0

  6.16 2001/08/05 04:30:05 239.6   C2  10   944.0   252.0

  5.80 2001/08/05 04:54:06 239.4   C2  10   918.0   266.0

  5.62 2001/08/05 05:06:05 239.4   C2  10   905.0   273.0

  5.26 2001/08/05 05:30:05 239.1   C2  10   878.0   287.0

  4.89 2001/08/05 05:54:05 238.8   C2  10   851.0   300.0

  4.70 2001/08/05 06:06:05 238.7   C2  10   837.0   308.0

  4.31 2001/08/05 06:30:05 238.4   C2  10   809.0   323.0

  3.92 2001/08/05 06:54:05 238.1   C2  10   781.0   338.0





Derek

Possible comet visible on 4 consecutive C3 images.



Approximate positions 512x512 (0,0) top-left corner



2001/08/07 05:18 (331,276)

2001/08/07 05:42 (329,274)

2001/08/07 06:18 (326,274)

2001/08/07 06:42 (324,273)



Comment: if the object is real it will be visble also in

C2. I am waiting other images to confirm.



Regards,



Toni Scarmato

No real object at Toni's indicated positions. Note that the

positions are within the "vignetting zone" where the brightnesses

are strongly decreased!



Regards, Sebastian

I think I found a sungrazer crashing into Sun. It is in the middle of the top-left corner of the disc on the edge.



Details:



Time & Name of image     Co-ordinates

--------------------     -------------

20010808_1630_c2.jpeg    354 X 393  - possible comet seen here

20010808_1654_c2.jpeg    366 X 401  - same comet seen here

20010808_1706_c2.jpeg    371 X 405  - glow after hitting Sun



0 X 0 is the top left.



Unfortunately,  there are no C2 images from 8:30 to 16:30 for 8th August 2001, so I cannot trace anything earlier to 16:30.



Thanks and regards,

Sidda

The size of the image used in my last report are 1024X1024 pixels.



Thanks,

Sidda.

Possible comet in C2 images.



Positions 512x512 (0,0) top-left corner





2001/08/09 06:30 (460,482) B/w ?

2001/08/09 06:54 (459,474)

2001/08/09 07:31 (457,464)





Comment: object well visible on last two images.

I am waiting other images to confirm.





Regards,



Toni Scarmato

No cometary object at the positions idicated by Toni in 1024 

images.



Regards, Sebastian

I've looked at the most recent claims, the ones since the

confirmation of the Aug 4-5 comet.



I cannot confirm any of these recent claims.  As Sebastian

says about the T. Scarmato claim for an object on Aug 7, the

suspected object doesn't seem reasonable.



For the S. Eraiah claim of Aug 8, there are only two points which

seem reasonable.  The third, is obviously very different from the

first two.  The edge of the Sun is actually far inside the disk

and no such glow has ever been seen for any comet.



The latest T. Scarmato claim, for Aug 9, seems unlikely.  The

apparent motion is not linear.



Doug 

Possible comet in C2 real-time images.



Positions 512x512 (0,0) top-left corner:



2001/08/10 06:06 (506,460)

2001/08/10 06:30 (496,451)

2001/08/10 07:31 (476,428) B/W





Comment:  object well visible move toward the sun.

Sem just a comet.  I am waiting other images to confirm.





Toni Scarmato

Regarding Toni's report in 1024 im ages:



It doesn't seem to be a comet. In the images of 6:06 and 6:30

there are these 2 bright spots but in 7:54 image nothing is at

the positions where the object should be. One have to be careful 

with reports of objects with that shape especially after strong

CME's or X-flares. Threre are a couple of these "objects" in

indicated images.



Regards, Sebastian

Hi all.



Yes, Sebastian is rigth, I Have download now other images and on 07:54 image the object is not visible, but on image at 07:31 B/W there is an object in agreement with the others points also in 

shape and brigthness.



It is an X comet?



I am searching in 1024 C3 images to verify.  Seem fairly brigth

to be visible in C3 camera if it is real.



Regards,



Toni

Toni,



I have already checked the 1024 C3s and could not find anything.



Sebastian

Possible sungrazer comet in LASCO C2 images.



12 Aug 01 - 1756hrs PST



Only have three consecutive frames.



Positions: 512x512 images,(0,0) upper left



time            (x,y)



2001/08/11/0554 - 417,186

2001/08/11/0606 - 399,198

2001/08/11/0630 - 363,214



Best regards



Mel

Possible comet in C3 realtime images (1024 x 1024)



0813_0018   968, 565

0813_0042   963, 563

0813_0142   959, 561

0813_0218   953, 559



Condensed and brightening.



--Tony Hoffman

Nothing at 0318. (Positions were from upper left, by the way.)



--Tony Hoffman

Possible comet in C3 real-time images.



Positions 512x512 (0,0) top-left corner



2001/08/13 08:42 (357,348)

2001/08/13 09:18 (356,346)

2001/08/13 10:20 (352,342)

2001/08/13 10:42 (351,339) brigh



Commnet: the object seem moving on a reliable orbit

toward the sun.

I am waiting other images to confirm.



Regards,



Toni Scarmato

Hi all,

	I've checked all the recent reports and cannot confirm

any of them.  None of them appear in additional frames which would

be required for confirmation.  In addition, some of them are

bright in one image and not there in the image before (or after).

Just not reasonable.



	A note about our observations.  Beginning tomorrow, Aug 14,

we are taking full color filter sequences in the C3 telescope

every 2 hours for a whole month.  We are hoping to actually catch

some comets.  I don't think this will actually be noticeable to you

and it doesn't require anything special.  Just the usual detection

of comets.  But, the brighter the better.



Doug

A few notes:



First, the data gap on Aug 14 from 0100-1600 UT is real and will

not be filled in.  Something happened to our on-board computer,

we don't know what.  It appears to be functioning properly now.

See how suddenly this all could end?



Second, due to the difficulties and the lack of Deep Space

Network Telescope time for SOHO, we were unable to load the

plan containing the color sequences for C3.  We did run a single

sequence at 1800 UT, but that'll be it until tomorrow.  We're

hoping everything will return to normal tomorrow.



Doug

Possible comet in LASCO C3 b/w images, starting 20010815_0642_c3



Date: Aug 15, 2001



Description: Moving dot in 4 b/w images.



Positions: (0,0) upper left, 512x512 images (extrapolated from 

            b/w by substracting 50 pix from y-pos)



Time     (x,y)

06:42   360,303

07:42   355,300

08:42   350,296

09:42   344,292



I missed the xx.18 images.

More on this soon.



Sebastian Hoenig

C/1996 J1 Evans-Drinkwater found in LASCO C3 images



It is in 190 (one hundred and ninety) C3 images from 

21 Dec 1996 04:18 to 9 Jan 1997 12:55 It will also be 

in other images of different image formats and sizes, 

all the images I have checked are 1024x1024



Sample position with Magnitude

LASCO C3 1024x1024 images

0,0 in bottom left corner



Image        Col Row  Date       Time          Mag

32011096.fts 21  701  1996/12/22 22:36:40.981  8.5 



I will post more positions at a later time and hopfully 

produce a light curve. The above Mag estimate is provisional.



Joint credit for this find goes to Jonathan Shanklin.

Jon asked me if I could check the C3 images from 

20 Dec 1996 to 9 Jan 1997 as he calculated it may just be

in the C3 field at the northern edge, but it may be too

faint to be detected. I downloaded and processed the images 

for this period only to find it was not there.



I obtained the elements for the orbit from Jon and I 

worked out that it that it should be at the left hand 

edge of the images moving upwards slowly. Another look 

at the images soon uncovered the comet.



C/1996 J1 is fairly condensed with a very slightly diffuse

coma. No tail is visible. It's brigtness does vary along it's

track.



The images for the period 29 Dec 1996 to 9 Jan 1997

are very sparse at the full resolution with about 2 images

per day.



Incidently, this is another 'Twin' if it can loosly be called

that, (very loosly, I know it's not really) the other comet 

in the same field is SOHO-6



Regards



Michael Oates

Additional information on my last report.



I tended to withdraw my report because the object changes very 

much in shape regarding the 1024 images. What makes me hesitating 

is that I could locate it in the 1024 images of 6:18, 6:42, 7:42,

8:18, 8:42, 9:18, 9:42 (+ 5:42 b/w) on a reliable trajectory with 

reliable speed. That's a strong argument PRO comet. I now give 

the 1024 positions, (0,0) upper left.



Time    (x,y)

05:42  730,614 b/w

06:18  725,611

06:42  720,607

07:42  710,600

08:18  704,596

08:42  700,592

09:18  694,588

09:42  689,584



I am suspended how this will be decided.



BTW: Well done Mike and Jon!



Regards, Sebastian

Additional information #2 on comet report.



Okay, now I am quite sure on it. 10 images are confirmation 

enough , isn't it. Bad luck for Doug as he couldn't use it for the

color series investigation.



Positions: (0,0) upper left, 1024x1024



Time    (x,y)

04:42  739,622

05:18  735,618

05:42  730,615 

06:18  725,611

06:42  720,607

07:42  710,600

08:18  704,596

08:42  700,592

09:18  694,588

09:42  689,584



Regards, Sebastian

Sorry for the long delay, I was just waiting for the data gaps

to get filled in.  I do confirm S. Hoenig's claim for a comet in

the C3 data from Aug 16.  I haven't spotted this one in C2, but

it is pretty darn faint.  My position measurements given below.

This makes it SOHO-344.



Doug



#COMMENT: COMET SOHO-344

# HEIGHT   DATE     TIME   ANGLE  TEL  FC    COL     ROW

 14.22 2001/08/15 05:42:05 240.0   C3  10   730.0   408.0

 13.82 2001/08/15 06:18:05 240.5   C3  10   725.0   413.0

 13.48 2001/08/15 06:42:05 240.5   C3  10   720.0   416.0

 12.82 2001/08/15 07:42:35 240.9   C3  10   711.0   423.0

 12.32 2001/08/15 08:18:05 241.2   C3  10   704.0   428.0

 12.03 2001/08/15 08:42:05 241.4   C3  10   700.0   431.0

 11.61 2001/08/15 09:18:05 241.5   C3  10   694.0   435.0

 11.33 2001/08/15 09:42:31 241.7   C3  10   690.0   438.0

 10.78 2001/08/15 10:20:04 241.9   C3  10   682.0   443.0

 10.52 2001/08/15 10:42:05 242.6   C3  10   679.0   447.0

  9.92 2001/08/15 11:18:05 242.7   C3  10   670.0   452.0

  9.63 2001/08/15 11:42:05 243.0   C3  10   666.0   455.0

Possible comet, not Kreutz, visible in five cosecutive C3 images.



Format- 1024x1024 Pixels  (0,0) Top left corner



  Date       Time     X   Y     Movement        Area Swept

                                (Pix/Min)        (Sq Pix)

2001 08 13   08:42   873,785     

2001 08 13   09:18   875,785      0.056               8

2001 08 13   10:20   878,785      0.048               7

2001 08 13   10:42   879,785      0.045               6

2001 08 13   13:42   887,785      0.044               6



Regards

Enoch Singh

Suspect brigth object visible in C3 images.



Positions 512x512 (0,0) top-left corner:



2001/08/17 03:42 (327,285)

2001/08/17 05:18 (316,277)

2001/08/17 05:42 (315,275)





Comment:  if the object is real it must to be

visible in C2 images.  I am searching to confirm.



Note:  the object is not visible on image at 03:18.



Regards,



Toni Scarmato

I am unable to confirm the last two reports.



The report of E. Singh is almost certainly a star, as the

motion is consistent with all of the other stars in the image.

As always, anything moving left to right is most probably a

star or planet.



The report of T. Scarmato appears to be just cosmic rays.  When

the data are as noisy as they are right now, one probably needs

to observe something in much more than 4 images for us to confirm

it.  These solar proton storms just make the data difficult for

quite a long period of time.  Nothing for us to do but wait for

the flux to go down.

Further to my report logged at 20010817 025909 I have six more

positions of the object (total 11 positions). Object Moving away

from the sun in a predictable manner. 



Format- 1024x1024 Pixles    (0,0) Top left corner



 2001 08 13   07:42   871,785

 2001 08 13   08:18   872,785

 

 2001 08 13   14:18   888,785

 2001 08 13   14:42   889,785

 2001 08 13   15:18   891,785

 2001 08 13   15:42   892,785



Regards

Enoch Singh

Just a quick note:



I have figured out that the star indicated by Enoch Singh is

SAO 98344 (8.9mag, RA 9h05m2.86s, DEC +11°33m57.42s).



Regards, Sebastian

Dear Doug,



waiting the end of the strong flux from the Sun, I Have looking

again at the images of the report from Aug 13 2001

11:48:55 regarding an object in C3 images.



I find that the object seem visible on other images starting

form 07:42 UT.



Approximate Positions 512x512 (0,0) top-left corner:



2001/08/13 07:42 (360,349)

2001/08/13 08:18 (358,348)

2001/08/13 08:42 (357,347)

2001/08/13 09:18 (356,346)

2001/08/13 10:20 (352,342)

2001/08/13 10:42 (351,340)



This last position is different to previous post because 

looking well on images I Have noted that the brigth point

is not in agreement. Instead, there is another point more faint

that is in agreement with the previous point in shape, 

brigthness, and with the time interval.



Due to the time gap of the images, I Have extrapolated the

positions for the object.

If the motion is regular at 13:42 UT the object must to be

approximately at X=340 and Y=324.



I find an object at followings approximate positions:



512x512 (0,0) top-left corner.



2001/08/13 13:42 (340,325)

2001/08/13 14:18 (338,323)

2001/08/13 14:42 (337,322)

2001/08/13 15:18 (334,318)

2001/08/13 15:42 (333,316)

2001/08/13 16:18 (330,314)



The object continue to be faint.



Now,I want to work on 1024 images to verify this observations

and eventually to do positions more precises.



Regards,



Toni Scarmato 

Update: Positions for C/1996 J1 Evans-Drinkwater 

found in SOHO LASCO C3 images.



I was going to produce a light curve for this comet, but as I

am having difficulties, and this is a rather important find,

Doug will be making the measurments. I show the positions here

for those who would like to see the comet for themselves.



LASCO C3 1024x1024 images

0,0 in bottom left corner

As there are rather a lot of these images (190), I am 

posting approx 1 in 10 here with positions.



Image        Col Row  Date       Time         Mag & Notes 

32011051.fts 7   680  1996/12/21 04:18:11.333

32011079.fts 16  693  1996/12/22 07:34:16.599  

32011088.fts 19  697  1996/12/22 15:06:45.639

32011097.fts 22  702  1996/12/22 23:26:42.452 8.5 

32011238.fts 24  705  1996/12/23 06:57:46.792

32011249.fts 27  710  1996/12/23 16:48:57.752

32011257.fts 29  714  1996/12/23 23:29:30.121

32011128.fts 32  718  1996/12/24 07:50:35.134

32011137.fts 34  722  1996/12/24 15:20:59.173

32011147.fts 37  726  1996/12/25 00:12:28.767

32011157.fts 40  730  1996/12/25 08:33:13.178

32011167.fts 42  735  1996/12/25 16:54:03.991

32011177.fts 45  739  1996/12/26 01:52:54.181

32011187.fts 48  743  1996/12/26 10:13:49.593

32011197.fts 51  748  1996/12/26 19:54:57.458

32011207.fts 53  752  1996/12/27 04:15:39.972

32011217.fts 55  757  1996/12/27 12:36:44.081

32011227.fts 58  761  1996/12/27 21:43:05.555

32011637.fts 62  768  1996/12/28 11:55:37.275

32011668.fts 66  773  1996/12/28 22:20:19.020

All available 1024x1024 images are included from this point

32011260.fts 67  777  1996/12/29 04:18:10.732

32011261.fts 71  783  1996/12/29 16:38:04.712

32011272.fts 74  789  1996/12/30 04:18:10.115

32011284.fts 77  795  1996/12/30 16:17:48.007

32011294.fts 81  801  1996/12/31 04:18:11.797

32011306.fts 85  806  1996/12/31 16:18:36.688 Superimposed on noise? very bright

32011317.fts 88  813  1997/01/01 04:18:08.678

32011329.fts --  ---  1997/01/01 16:18:11.369 Missing data in comet area

32011340.fts 94  825  1997/01/02 04:18:09.060

32011352.fts 98  831  1997/01/02 16:18:09.450

32011363.fts 101 837  1997/01/03 04:18:10.441

32011390.fts 107 848  1997/01/04 04:18:11.839

32011408.fts 110 854  1997/01/04 16:22:27.577

32011425.fts 113 860  1997/01/05 04:18:10.419 Superimposed on noise? very bright

32011443.fts 116 866  1997/01/05 16:18:10.961

32011450.fts 117 868  1997/01/05 20:45:06.728

32011461.fts 119 872  1997/01/06 04:18:10.001

32011497.fts 125 884  1997/01/07 04:18:09.683

32011510.fts 127 888  1997/01/07 12:55:05.425

32011521.fts 129 892  1997/01/07 20:24:27.400

32011532.fts 131 896  1997/01/08 04:18:09.561

32011545.fts 133 900  1997/01/08 12:55:05.600

32011556.fts 135 904  1997/01/08 20:45:05.461 Close to star

32011557.fts 135 904  1997/01/08 21:38:44.434 Close to star

32011567.fts 137 908  1997/01/08 04:17:58.731

32011580.fts 139 911  1997/01/09 12:55:05.369

32011590.fts 141 915  1997/01/09 19:53:30.156



Regards



Mike

Toni, I checked the 1024 images on Aug 13 and again today. There

is absolutely nothing above the noise level. At the second set of

positions you spot in some images one of the Stars 

SAO 98502 (8.6mag), SAO 98501 (9.2), SAO 98485 (9.1). They are

very hardly visible in 1024 images and at least the 14:18 position

is one of the stars. Also this secons set of positions contains 

some inconsitances.



Regards, Sebastian

Possible comet in C2 images.



Starting at 2001/08/20 00:54 at positions (480,454) on image

512x512 (0,0) top-left corner.

Visible in 4  consecutive images fading too fast.



Other positions at next post.





Regards,



Toni Scarmato

Upadate C2 last post:



positions 512x512 (0,0) top-left corner:





2001/08/20 00:54 (480,454)

2001/08/20 01:31 (463,441)

2001/08/20 01:54 (455,432)

2001/08/20 02:06 (452,427)





Comment: the object starting very condensed and fade too fast.

I am unable to find it on other 512 pixels images.





Regards,



Toni

Possible comet in LASCO C2 images



Date Aug 21, 2001



faint spot moving with about 60 pixel/hour



Positions in 512x512 images

enlarged to 1024x1024



Time  (x,y) from upper left



20:27  1006,352

20:50   985,349

21:26   950,345

21:50   926,342

22:06   910,340



Regards,

Rainer Kracht

Possible comet in C3 images - 20010822_1642 UT



Object just above 4 pm solar streamer right side, 

moving away in 2 images towards the dark "glitch"

in C3.



Hard to know when next new images are coming out 

or if they will be on time. Is SOHO having problems?



Yeah, I know, less than 3 images to be sure.



 ****** NOTE ******

x-coordinates are probably correct, 

but y-coordinates may be off by

several pixels.





0,477 in lower left corner



                  LASCO C3 IMAGES

     

Date & UT            Size         X and Y 

of Images            used       Coordinates       

--------------------------------------------

20010822_1642.gif  512 x 512    333, 264      

20010822_1718.gif  512 x 512    334, 263

    

----------------

Michael Boschat

Update C2 Report Aug 21



one additional image and 1024x1024 images



Time     (x,y) from top left   Size used

20:27         1007/352         1024x1024

20:50          986/350         1024x1024

21:26          950/346         1024x1024

21:50          926/342         512 enlarged to 1024

22:06          910/340         512 enlarged to 1024

22:27          888/339         1024x1024



The 1024 images from 21:50 and 22:06 are still missing.

The object could be visible in these images also:



23104216.fts 20:54 150.1 sec Blue Clear

23104217.fts 20:59  25.1 sec Orange Clear.



Object not found in images 23:26, 23:50 and 00:06.



Regards,



Rainer Kracht

Disregard my report of:



Aug 22 2001 14:29:18



Nothing seen.



Mike B.

Possible comet in C3 at position



512x512 (0,0) top-left corner



2001/08/23 13:42 (395,335)

2001/08/23 14:42 (387,328)

2001/08/23 15:18 (384,333)



The object move toward the sun on a reliable orbit and

increase your brigthness in reliable way.



I am waiting other images to confirm.





Regards,



Toni Scarmato

No consider my last report the object is not visible at

15:42.



Toni Scarmato

Hi all.



Doug seems to be quite busy at the moment so I have looked at all

the recent reports, so everybody can get an idea what's going on:





Toni (Aug 20 2001 11:36:16) Combination of cosmic rays of the 

                            ongoing proton event



Rainer (Aug 22 2001 16:11:46) Yes, that looks good. I could

                              follow the object in th Fits images

                              and it seems to be a non-Kreutz

                              comet visible in 6 images.

                              If you ask me: Congratulations!



All the other reports have been withdrawn.



Regards, Sebastian

Possible realtime comet in c2 images:

1024x1024 top-left corner



2001/08/25 0806   714  18

2001/08/25 0926   721  83

2001/08/25 0950   714  101

2001/08/25 1106   693  163

Possible realtime comet in c2 images:

1024x1024 top-left corner



2001/08/25 0806   714  18

2001/08/25 0926   721  83

2001/08/25 0950   714  101

2001/08/25 1106   693  163





Chen Dong Hua

Update C2 last post:



Position:(0,0) upper left,1024x1024 

 

2001/08/25   741  18

2001/08/25   721  83

2001/08/25   714  103

2001/08/25   693  162



Sorry



Chen Dong Hua

I can confirm the object observed by Chen Dong.



Seem just a not Kreutz comet also visible on 4 C2 images

at 512 pixels.







Regards,



Toni

Continuing my search in C2 images I Have observed 

another suspect object on 4 consecutive images

at following positions:





512x512 (0,0) top-left corner:



2001/08/25 08:06 (27,362)?

2001/08/25 09:26 (35,356)

2001/08/25 09:50 (38,353)

2001/08/25 11:06 (47,347)



Comment: object moving on a not Kreutz orbit.

I am not sure on this one because need other images

to confirm.  Also, on the last images the brigthness 

increase much.



Regards,



Toni Scarmato

I cannot confirm Toni's observation but I also do confirm Chen

Dong Hua's non-Kreutz comet. 



Regards, Sebastian

A suspect object in 4 realtime c2 images, 

it seem  has a tail and moved away the Sun.

What is it?  The comet that I found yesterday?

 

1024x1024 (0,0) top_left corner



2001/08/26 0027  470  809

2001/08/26 0050  464  826

2001/08/26 0127  454  852

2001/08/26 0206  444  881



I am waiting other images.



Chen Dong Hua

The suspect object can be seen on image

at 23:26 (2001/08/25).



Position : 1024x1024 (0,0) upper left: 



2001/08/25 2326  487  762



Chen Dong Hua

Congratulations Chen, it's seems that it's the same nice non-Kreutz comet that you discovered yesterday. May be it will be visible also in C3 soon.

Xavier L.

non-Kreutz Chen's comet is visible in  3 C3 images now from 3:42 to 6:42 under the occultor.

Xavier

The C3 positions for the object reported in C2 Chen Dong Hua are

(based on 1024x1024 upper left 0,0):

8/26 0342 x=501 y=580

8/26 0518 x=496 y=592

8/26 0642 x=493 y=602

8/26 0742 x=490 y=608

James Danaher

Possible comet in 4 consecuitive real-time C3 images.



Positions 512x512 (0,0) top-left corner:



2001/08/26 06:42 (438,337)

2001/08/26 07:42 (435,333)

2001/08/26 09:18 (428,324) b/w

2001/08/26 09:42 (427,323)





Comment: object moving to the sun on an apparent Kreutz

orbit, wel visible on 512 images.





Regards,



Toni Scarmato

I cannot confirm Toni's object.



Chen's non-Kreutz comet must have a relatively large perihelion

distance as the tail points towards the sun in C2 and the movement

through C2 images is quite slow.

Further to Sebastian's comments about Chen's comet, looks

like a possibility for ground based observations from the

southern hemisphere in a week or two.  Hope we get an orbit

on this one before then!



Terry Lovejoy

Congratulations to Chen for this find.



If you look at the velocity of this comet, it has slowed right

down by 12:42. I suspect that it may be at the furthest southerly 

point, and may start to move back toward the Sun shortly, moving 

back along the path it came, but slightly to the left of it's

previous path. In other words we are looking at the orbit roughly

edge on, with a perihelion time at about 7:00 UT 26 Aug.



A very nice discovery.



Michael Oates

Chen's comet has re-entered the C2 field at 18:50

Just as I predicted :) (Well it's either that or another one)

Much fainter this time round.



0,0 in bottom left corner of 1024x1024 C2 images

Image                Col Row

20010826_1850_c2.gif 354 4

20010826_1927_c2.gif 359 23

20010826_2027_c2.gif 366 55



Michael Oates

Mike,



it indeed is Chen's comet. I followed it in C3 and it faded

dramatically.



Regards, Sebastian

Possible ex-sungrazer in C3 images - 20010826_1842 UT



 There is a bright point moving

away from Sun above the semi-bright 

star above the dark "glitch" to the 

right. Near the 4 pm position.

The area is bright and was hard to

get exact XY's but close to area.



 (  ) -- disk

       

        . - object  

       * -- star

      # -- dark glitch





 ****** NOTE ******

x-coordinates are probably correct, 

but y-coordinates may be off by

several pixels.





0,477 in lower left corner



                  LASCO C3 IMAGES

     

Date & UT            Size         X and Y 

of Images            used       Coordinates       

--------------------------------------------

20010826_1842.gif  512 x 512    351, 251      

20010826_2042.gif  512 x 512    354, 251

20010826_2118.gif  512 x 512    356, 251

20010826_2142.gif  512 x 512    359, 252 

      

----------------

Michael Boschat

Disregard my last post. 

It's unusal that I can see the object 

on 512 pixel images "but" after a long download

of the 1024 pixel images, it was not visible! 

amazing.



 I think my eyes are going bad now.

Hard to see things as I could last year

even looking at the sky is funny. 

I could not even see the new soho comet 

in C2 on it's "return" as said 

by Oates!!



Mike Boschat

Hi all,

	Sorry for the lack of posts.  I've been checking the reports

but not posting myself.  Other things are occupying my time.



	Anyway, the Aug 21 C2 object reported by R. Kracht is still

being considered.  I haven't made up my mind on this one.



	The Chen Hua Dong find for Aug 25-26, the non-Kreutz comet

is of course, easily confirmed and did apparently do a C2-C3-C2

transit thing, fading rapidly.  A short period comet inclined 90

degrees to the ecliptic?  That's a strange one, I think.  Still

waiting on more data.  My positions below:



# HEIGHT   DATE     TIME   ANGLE  TEL  FC    COL     ROW

  3.07 2001/08/25 23:26:05 173.9   C2  10   486.0   260.0

  3.30 2001/08/25 23:50:05 173.0   C2  10   480.0   242.0

  3.46 2001/08/26 00:06:07 172.3   C2  10   475.0   230.0

  3.65 2001/08/26 00:27:16 171.8   C2  10   470.0   215.0

  3.86 2001/08/26 00:50:05 171.3   C2  10   465.0   198.0

  3.65 2001/08/26 00:27:16 171.8   C2  10   470.0   215.0

  3.86 2001/08/26 00:50:05 171.3   C2  10   465.0   198.0

  4.21 2001/08/26 01:27:18 170.3   C2  10   455.0   171.0

  4.42 2001/08/26 01:50:06 169.8   C2  10   449.0   155.0

  4.57 2001/08/26 02:06:07 169.4   C2  10   444.0   143.0

  4.76 2001/08/26 02:27:11 169.1   C2  10   439.0   128.0

  4.96 2001/08/26 02:50:05 168.8   C2  10   434.0   113.0

  5.25 2001/08/26 03:26:12 168.2   C2  10   425.0    90.0

  5.45 2001/08/26 03:50:05 168.0   C2  10   420.0    74.0

  5.60 2001/08/26 04:06:07 167.7   C2  10   415.0    63.0

  5.75 2001/08/26 04:27:14 167.4   C2  10   410.0    51.0

  6.19 2001/08/26 05:26:06 166.9   C2  10   398.0    17.0

  6.35 2001/08/26 05:50:05 166.7   C2  10   393.0     4.0

  6.47 2001/08/26 18:50:06 162.5   C2  10   354.0     5.0

  6.25 2001/08/26 19:27:20 162.3   C2  10   358.0    23.0

  6.10 2001/08/26 19:50:06 162.2   C2  10   361.0    35.0

  6.00 2001/08/26 20:06:05 162.3   C2  10   364.0    42.0



# HEIGHT   DATE     TIME   ANGLE  TEL  FC    COL     ROW

  4.98 2001/08/26 03:18:05 169.6   C3  11   502.0   446.0

  5.22 2001/08/26 03:42:06 169.4   C3  11   501.0   442.0

  5.90 2001/08/26 05:18:12 167.8   C3  11   496.0   431.0

  6.08 2001/08/26 05:42:05 167.6   C3  11   495.0   428.0

  6.51 2001/08/26 06:42:09 166.9   C3  11   492.0   421.0

  6.93 2001/08/26 07:42:06 166.8   C3  11   490.0   414.0

  7.31 2001/08/26 09:18:05 166.1   C3  11   487.0   408.0

  7.43 2001/08/26 09:42:07 165.8   C3  11   486.0   406.0

  7.49 2001/08/26 10:42:09 166.0   C3  11   486.0   405.0

  7.56 2001/08/26 11:18:05 165.6   C3  12   485.0   404.0

  7.69 2001/08/26 11:42:06 165.4   C3  12   484.0   402.0

  7.70 2001/08/26 12:42:10 165.0   C3  12   483.0   402.0

It's just not my day.  Anyway, of course, the comet was first

reported to be visible earlier in the day on Aug 25.  Those

positions are given below.



Doug



# HEIGHT   DATE     TIME   ANGLE  TEL  FC    COL     ROW

  6.76 2001/08/25 08:06:05 335.3   C2  13   743.0  1004.0

  6.50 2001/08/25 08:32:13 335.1   C2  13   736.0   983.0

  6.16 2001/08/25 09:06:05 334.7   C2  13   727.0   956.0

  5.95 2001/08/25 09:26:05 334.5   C2  13   721.0   940.0

  5.71 2001/08/25 09:50:05 334.3   C2  13   714.0   921.0

  5.29 2001/08/25 10:30:01 333.5   C2  13   704.0   888.0

  5.10 2001/08/25 10:50:05 333.4   C2  13   698.0   873.0

  4.93 2001/08/25 11:06:05 333.2   C2  13   693.0   860.0

  4.73 2001/08/25 11:26:05 332.6   C2  13   689.0   844.0

  4.46 2001/08/25 11:50:06 332.2   C2  13   681.0   823.0

  4.31 2001/08/25 12:06:05 331.8   C2  13   677.0   811.0

  4.08 2001/08/25 12:27:43 331.1   C2  13   672.0   793.0

  3.84 2001/08/25 12:50:05 330.4   C2  13   666.0   774.0

New! J. Shanklin has compiled a list of asteroids brighter

10.5 that could be seen in the C3 telescope.  The list runs

through 2009.  Let's hope the mission lasts that long.

Click on the "C3 Transits" page to find the list.



Now, how about some bright sungrazing comets sometime soon?



Doug