Central Bureau for Astronomical Telegrams
IAUC 6650: C/1997 H2
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Circular No. 6650
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)
COMET C/1997 H2 (SOHO)
C. St. Cyr, NASA Goddard Space Flight Center, reports that Shane
Stezelberger, SOHO-LASCO Operations, has discovered a comet on images
obtained with coronagraphs aboard the SOHO mission, which is located
near the Lagrangean point 0.01 AU sunward of the earth. Detections
were made with the C3 "outer" coronagraph during Apr. 29.3-30.0 UT,
the comet moving in from 31.43 R_sun from the sun's center in p.a.
296.2 deg (with respect to solar north); with the C2 "inner" coronagraph
during May 1.6-1.8 and 2.5-2.6 (minimum 2.88 R_sun); and with C3 during
May 3.0-5.0 out to 30.51 R_sun in p.a. 114.6 deg. J2000.0 positions,
reduced by G. V. Williams and given in more detail on MPEC 1997-J05, are
summarized below, together with parabolic orbital elements by the
undersigned. The ephemeris is uncertain, because of difficulty
correlating the C2 and C3 positions.
1997 UT R.A. (2000) Decl. m1
Apr. 29.265 1 50.6 +14 43
30.024 2 01.8 +14 57
May 1.649 2 27.8 +15 21 2-5
1.826 2 30.6 +15 24
2.479 2 41.0 +15 35
2.597 2 42.9 +15 36
3.020 2 50.3 +15 41
4.990 3 21.7 +16 00
T = 1997 May 2.83 TT Peri. = 191.57
Node = 227.21 2000.0
q = 0.1373 AU Incl. = 18.42
1997 TT R. A. (2000) Decl. Delta r Elong. Phase m1
May 10 4 26.37 +15 50.1 0.957 0.326 18.9 89.7 8.0
11 4 38.30 +15 45.4 0.936 0.359 20.8 91.3 8.4
12 4 50.16 +15 39.3 0.917 0.390 22.7 92.1 8.7
13 5 02.00 +15 31.6 0.901 0.421 24.6 92.4 9.0
14 5 13.84 +15 22.3 0.886 0.452 26.5 92.3 9.3
15 5 25.67 +15 11.4 0.873 0.482 28.4 91.9 9.5
16 5 37.50 +14 58.7 0.862 0.511 30.4 91.1 9.8
17 5 49.30 +14 44.3 0.854 0.540 32.3 90.2 10.0
18 6 01.06 +14 28.1 0.847 0.568 34.2 89.0 10.2
19 6 12.75 +14 10.2 0.842 0.596 36.1 87.7 10.4
20 6 24.34 +13 50.7 0.838 0.624 37.9 86.3 10.6
(C) Copyright 1997 CBAT
1997 May 9 (6650) Brian G. Marsden
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