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LASCO C/1999 U2 (Marsden) Group Comets


PERIHELION DATE COMET DESIGNATION COMET DISCOVERER TELESCOPE PERIHELION DISTANCE ORBIT UPDATES
1996-11-11.78C/1996 V2
SOHO-930
R. KrachtC30.0488 
1997-01-29.51C/1997 B5
SOHO-1083
R. KrachtC20.0512 
1997-01-29.61C/1997 B6
SOHO-1084
R .KrachtC20.0501 
1997-01-29.65C/1997 B7
SOHO-1085
R. KrachtC20.0490 
1998-01-03.74C/1998 A2
SOHO-404
R. KrachtC20.04107853
1998-01-10.79C/1998 A4
SOHO-406
R. KrachtC20.04317863
1998-01-09.30C/1998 A3
SOHO-407
R. KrachtC20.04197853
1999-05-11.59C/1999 J6
SOHO-109
M. OatesC2, C30.04927386,7832
1999-07-11.24C/1999 N5
SOHO-408
R. KrachtC2, C30.04967854
1999-08-05.11C/1999 P6
SOHO-411
R. KrachtC20.04947863
1999-08-14.99C/1999 P8
SOHO-413
R. KrachtC20.04947863
1999-08-15.04C/1999 P9
SOHO-414
R. KrachtC20.04937863
1999-10-25.23C/1999 U2
SOHO-090
S. Gregory, J. ShanklinC2, C30.04927292,7832
2000-02-04.48C/2000 C7
SOHO-441
R. KrachtC20.04817919, 7958
2000-02-04.59C/2000 C3
SOHO-102
D.A. BieseckerC20.04877364,7832
2000-02-05.17C/2000 C4
SOHO-101
M. MeyerC2,C30.04877364,7832
2002-09-02.54C/2002 R1
SOHO-511
R. KrachtC20.04927969
2002-09-03.30C/2002 R4
SOHO-512
R. KrachtC20.05207984
2002-11-12.42C/2002 V5
SOHO-542
R. MatsonC2, C30.05068073
2003-08-21.00C/2003 Q1
SOHO-651
T. HoffmanC20.04998339, MPEC 2008-Y06
2003-08-25.14C/2003 Q6
SOHO-656
R. KrachtC20.04948339, MPEC 2008-Y06
2004-11-08.56C/2004 V9
SOHO-859
H. OtterstedtC2,C30.0492 
2004-11-08.45C/2004 V10
SOHO-860
K. BattamsC20.0488 
2004-11-29.26C/2004 W10
SOHO-873
R. KrachtC20.0467 
2005-03-10.54C/2005 E4
SOHO-915
R. KrachtC3,C20.0487 
2005-04-14.26C/2005 G2
SOHO-939
H. SuC2,C30.0492MPEC 2005-H24
2005-11-17.28C/2005 W1
SOHO-1048
H. SuC3,C20.0482 
2005-11-29.91C/2005 W5
SOHO-1062
H. SuC2,C30.0494 
2006-03-15.42C/2006 E2
SOHO-1113
R. MatsonC3,C20.0482 
2006-03-25.54C/2006 F3
SOHO-1117
T. HoffmanC20.0510 
2007-12-22.16C/2007 Y4
SOHO-1422
R.KrachtC20.0505 
2008-01-15.75C/2008 A3
SOHO-1429
R.KrachtC20.0493 
2008-12-07.55C/2008 X06
SOHO-1593
R.KrachtC20.0497 
2008-12-07.59C/2008 X05
SOHO-1582
R.KrachtC20.0342 
2008-12-22.24C/2008 Y11
SOHO-1593
R.KrachtC20.0476 
2009-05-15.68C/2009 J12
SOHO-1650
R.KrachtC20.0417 
2009-C/2009
SOHO-1712
B.ZhouC3,C2     
2009-C/2009
SOHO-1717
B.ZhouC3,C2     
2009-C/2009
SOHO-1828
J.RuanC2,C3     
2010-C/2010
SOHO-1882
R.KrachtC2     
2010-C/2010
SOHO-1884
B.ZhouC2     
2011 C/2011
SOHO-2024
R.Matson C3,C2     
2011 C/2011
SOHO-2096
R.Kracht C2     
2011 C/2011
SOHO-2115
A.Watson C3,C2     
2012 C/2012
SOHO-2254
B.Zhou C3,C2     
2012 C/2012
SOHO-2261
S.Liwo C2     
2012 C/2012
SOHO-2263
Schmalz,Kida C2,C3     
2012 C/2012
SOHO-2275
S.Schmalz C2     
2012 C/2012
SOHO-2283
Z.Xu C2     
2012 C/2012
SOHO-2295
B.Zhou C3,C2     
2014 C/2014
SOHO-2825
Z.Xu C2,C3     
2015 C/2015
SOHO-3075
B.Zhou C2     
2015 C/2015
SOHO-3078
B.Zhou C2     

About this table: This table summarizes comets discovered and confirmed in SOHO satellite data. The Perihelion Date column represents the date at which the object reached its perihelion (closest approach to the Sun). The Comet Designation column represents the unofficial SOHO designation and also the official IAU designation. The Comet Discoverer column lists the person or persons who first reported the object. The Telescope column lists the SOHO instruments in which the object was discovered and/or observed. The Perihelion Distance column lists the object's closest approach to the Sun in units of AU (Astronomical Units). Additionally, the values are linked to the MPEC (Minor Planet Electronic Circular) that defines the official orbit for the object. The Orbit Updates column lists any subsequent orbit updates to the objects. Note that the majority of these links point to IAUC (International Astronomical Union Circular) files, which are only available to subscribers of CBATs Electronic Computer Service.


Note: It has been suggested in MPEC-X73 that C/2004 V9 may be the reappearance of C/1999 J6. Further to this, in MPEC-E87, C/2005 E4 has been linked with C/1999 N5. Also, in the same Circular, it is shown that when the orbits of C/1999 J6 and C/1999 N5 are 'reversed' one revolution to their 1993 perihelion passage, their orbits agree remarkably well. The conclusion here is that these two comets were most likely formed from the fragmentation of a larger body at or near perihelion in 1993.
Further linkages: C/2005 G2 is most likely a return of (part of) C/1999 N5. Also, C/1999 P6, P8 and P9 are most likely part of the fragmentation of the 1993 "parent" object.
C/2005 W1 is likely a return of C/2000 C4.


The Marsden-group "family tree"

Recent linkages of members the Marsden-group of 'sunskirting' comets indicate a fascinating evolution of the system. To best illustrate the linkages between the objects, a Marsden-group "family tree" has been constructed.
It is important to note that the links between these objects are not certain. There is ambiguity in almost all of the SOHO comet orbit determinations. However, the scenario laid out below is very probably correct.
         --------------------------------- C/1993 ?? ------------------------------
        |             |              |                  |                         |
   ?C/1999 P6?    ?C/1999 P8?    ?C/1999 P9?      ---C/1999 N5---          ---C/1999 J6---
        \             |             /             |             |          |             |
       did not survive 1999 perihelion??      C/2005 E4    C/2005 G2   C/2004 V9    C/2004 V10 

It appears that C/1999 P6, P8 or P9 did not survive their 1999 perihelion passage, or, at least, they are now too small to be detected by SOHO/LASCO.

Kreutz (by year):
1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
Non-Kreutz (by group):
C/1997 L2 (Meyer), Marsden, C/2000 O3 (Kracht), C/2003 R5 (Kracht II), Non-Group
SECCHI/STEREO
All Discoveries