Central Bureau for Astronomical Telegrams
IAUC 4229: 1983 XX; 1986g
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Read IAUC 4230
Circular No. 4229
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-495-7244/7440/7444
COMET 1983 XX (SOLWIND 6)
R. Howard, M. Koomen, D. Michels and N. Sheeley, Naval
Research Laboratory, report identification of another comet in the
SOLWIND coronagraph data. The apparent heliocentric separation F
(solar radii) and position angle O (counted from the solar north
pole) have been converted to R.A. and Decl. by the undersigned. On the
sixth data frame the coma was behind the occulting disk.
1983 UT F O R.A. (1950.0) Decl.
Sept. 24.863 8.1 230.5 11 54.4 - 0 50
24.870 7.8 230.4 11 54.8 - 0 49
24.878 7.6 231.2 11 55.0 - 0 47
24.885 7.3 230.6 11 55.3 - 0 47
24.892 7.2 230.5 11 55.5 - 0 47
25.062 < 2.5 231.8 (12 00.9 - 0 32)
Preliminary examination of the raw data suggests that SOLWIND 6 was
brighter than SOLWIND 2-5 (but certainly not SOLWIND 1). The tail
was still quite bright on Sept. 25.08 and present but fainter on
Sept. 25.14. Careful scrutiny of subsequent data reveals no trace
of the comet reappearing from behind the occulted area. The line
of sight was clearly very nearly in the comet's orbital plane.
Computations by the undersigned suggest that the comet was very
probably a member of the Kreutz group, a representative set of
orbital elements being as follows: T = 1983 Sept. 25.19 ET, Peri. =
78.39, Node = 357.94, Incl. = 143.95 (equinox 1950.0), q = 0.0076 AU.
PERIODIC COMET FORBES (1986g)
The recovery of this comet has been reported as follows. The
position is in close agreement with the ephemeris on MPC 10552:
1986 UT R.A. (1950.0) Decl. m2 Observer
Apr. 8.26431 11 11 10.55 + 8 33 43.9 20.5 Gibson
8.27181 11 11 10.09 + 8 33 46.2 "
May 9.21506 10 57 09.63 + 8 57 56.3 Danielson
9.22251 10 57 09.58 + 8 57 55.5 "
June 12.23681 11 09 04.48 + 6 38 09.8 19 Briggs
J. Gibson, G. E. Danielson and J. Holtzman (Palomar). 1.5-m
reflector + CCD. Reduced by J. Gibson. Comet stellar on Apr. 8.
J. Briggs and E. Everhart (Chamberlin field station). Very weak.
1986 June 25 (4229) Brian G. Marsden
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