Official Comet Hunting Guide
Report a SOHO Object
Report a STEREO Object
Basics (via NASA)
LASCO C3 Transits
STEREO L4/L5 Campaign
STEREO JAVA Orbit Tool
C2/C3 Comet Tracks
NASA Citizen Science
SOHO Real-Time Images
Comet McNaught in 2007
15-years of SOHO Comets
LASCO C/1999 U2 (Marsden) Group Comets
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.
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):