Circular No. 5646

Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION

Postal Address: Central Bureau for Astronomical Telegrams Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.

Telephone 617-495-7244/7440/7444 (for emergency use only) TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505

MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)

COMET SHOEMAKER (1992y)

The following precise positions have been reported:

1992 UT α_{2000} δ_{2000} m_{1} Observer
Oct. 25.47413 4^{h}23^{m}43.^{s}99 +25^{o}46′29′′.4 15.5 Shoemaker
25.51006 4 23 41.27 +25 47 10.5  _{”}
26.35381 4 22 38.75 +26 03 31.3  _{”}
26.41163 4 22 34.37 +26 04 38.4  _{”}
26.52152 4 22 25.87 +26 06 45.0  _{”}
27.80417 4 20 46.17 +26 31 53.5 15  Seki
27.81250 4 20 45.58 +26 32 03.3  _{”}
27.82128 4 20 44.83 +26 32 10.8 15  _{”}

E. M. Shoemaker, D. H. Levy, and H. Holt (Palomar). 0.46-m Schmidt films. Measured by C. S. Shoemaker and B. Cudnik.

T. Seki (Geisei). Communicated by S. Nakano.

Preliminary parabolic orbital elements by the undersigned from the 9 available positions, Oct. 25-27:

T = 1993 Mar. 25.83 TT  ω = 54.^{o}97
Ω = 55.30 }2000.0
q = 2.3111 AU  i = 65.99
1992TT α_{2000}  δ_{2000}  Δ  r  ϵ  β  m_{1}
Oct. 5 4^{h}39.^{m}86 +19^{o}53.^{′}6 2.351 2.990 120.^{o}9 16.^{o}7 15.6
10 4 37.42 +21 11.6 2.255 2.956 126.2 15.8 15.5
15 4 34.07 +22 34.9 2.164 2.924 131.7 14.7 15.3
20 4 29.73 +24 03.6 2.079 2.891 137.4 13.5 15.2
25 4 24.31 +25 37.4 2.000 2.860 143.2 12.0 15.1
30 4 17.75 +27 15.4 1.930 2.828 149.1 10.4 14.9
Nov. 4 4 10.04 +28 56.7 1.868 2.798 154.8  8.7 14.8
9 4 01.17 +30 39.7 1.816 2.768 160.1  7.0 14.7
14 3 51.20 +32 22.6 1.774 2.738 164.1  5.7 14.6
19 3 40.26 +34 03.1 1.742 2.710 165.4  5.3 14.5
24 3 28.52 +35 39.2 1.721 2.682 163.4  6.0 14.5
29 3 16.25 +37 08.8 1.710 2.654 159.0  7.7 14.4
Dec. 4 3 03.75 +38 30.5 1.710 2.628 153.3  9.7 14.4

1992 October 28 Daniel W. E. Green