C. St. Cyr, Naval Research Laboratory, reports, for the SOHO-LASCO Consortium (see IAUC 6685), the discovery by S. Stezelberger of a another comet in SOHO-LASCO C3 coronagraph images. This comet had a tail that was at least 3 solar radii long, and a preliminary estimate indicates that it was brighter than m1 = 4. Measurements by D. Biesecker and St. Cyr been reduced by G. V. Williams and are given on MPEC 1997-P04 in detail, the approximate discovery position being: 1997 UT R.A. (2000) Decl. Aug. 3.865 8 26.5 +14 06 C3 observations extend to Aug. 5.700 UT, while C2 observations are from Aug. 5.634 to 5.762, at which time the solar distance was 2.7 radii. The comet is apparently a Kreutz sungrazer--in fact, second in brightness to C/1996 Y1 among the Kreutz sungrazers observed by SOHO--but it is not possible to obtain a meaningful orbit solution from the complete data set.
International Astronomical Union Circular
- Pub Date:
- August 1997