Are all SOHO comets actually comets (as opposed to asteroids or other bodies)?
Probably, but we dont know for sure. Most are clearly cometary fragments. Some of SOHOs Kreutz fragments, and most of the objects belonging to the new groups, appear more or less stellar, with no visual cometary characteristics. Due to the short period of observation of objects in the LASCO field — from a few hours to a few days at most and the limited resolution of the coronagraphs, ~11 arc-seconds/pixel for C2, ~54 arc-seconds/pixel for C3, SOHO comet orbits are hard to accurately calculate, and sometimes it is not easy to determine the best of several possible orbital solutions. The majority of SOHO comets trace arcs that follow very near the nominal paths of either of the two main Kreutz subgroups. It is a safe assumption that SOHOs Kreutz orbits are at least fundamentally correct. The new comet groups discovered in SOHO images (the Meyer, Marsden, and Kracht groups, and another fledgling group that some are calling the Kracht2 group) are perhaps more problematic; visually, few of
