Central Bureau for Astronomical Telegrams
IAUC 4878: 1989w
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Read IAUC 4879
Circular No. 4878
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 or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
PERIODIC COMET HELIN-ROMAN-ALU (1989w)
The following additional precise positions have been reported:
1989 UT R.A. (1950) Decl. m1 Observer
Sept. 7.44097 2 09 55.37 + 3 20 01.7 16.5 Helin
8.40538 2 09 42.10 + 3 17 59.5 "
Oct. 8.71797 1 56 59.53 + 2 00 40.9 16.5 McNaught
10.74666 1 55 50.66 + 1 55 16.7 "
E. Helin, B. Roman, C. Mikolajczak, and A. Mejia (Palomar).
0.46-m Schmidt telescope. Measured by J. Alu. Pre-discovery
films; slight tail to the west-southwest.
R. H. McNaught (Siding Spring).
The following orbital elements, from 7 observations Sept. 7-Oct. 10,
indicate that this is a short-period comet, though there is still some
indeterminancy:
T = 1987 Nov. 8.411 ET Peri. = 218.227
e = 0.18870 Node = 73.079 1950.0
q = 3.67450 AU Incl. = 9.722
a = 4.52916 AU n = 0.102253 P = 9.64 years
1989 ET R.A. (1950) Decl. Delta r m1
Oct. 11 1 55.70 + 1 54.6 3.443 4.419 17.1
16 1 52.79 + 1 41.8
21 1 49.81 + 1 29.8 3.449 4.434 17.2
26 1 46.83 + 1 19.1
31 1 43.91 + 1 09.8 3.484 4.449 17.2
Nov. 5 1 41.10 + 1 02.2
10 1 38.46 + 0 56.6 3.550 4.465 17.2
15 1 36.03 + 0 53.1
20 1 33.86 + 0 51.7 3.642 4.480 17.3
25 1 31.97 + 0 52.7
30 1 30.40 + 0 55.9 3.759 4.496 17.4
Dec. 5 1 29.17 + 1 01.4
10 1 28.30 + 1 09.2 3.896 4.511 17.5
1989 October 13 (4878) Daniel W. E. Green
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