Central Bureau for Astronomical Telegrams
IAUC 4926: 1989c1
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 4927
Circular No. 4926
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
COMET AUSTIN (1989c1)
Precise positions reported by D. Herald, Kambah (near Canberra):
1989 UT R.A. (1950) Decl.
Dec. 14.48310 0 40 49.39 -59 37 59.0
17.48467 0 37 35.39 -58 32 38.9
Improved parabolic orbital elements from 12 observations,
Dec. 6-17:
T = 1990 Apr. 9.725 ET Peri. = 61.419
Node = 75.548 1950.0
q = 0.34984 AU Incl. = 58.876
The following ephemeris is provided for planning purposes.
The predicted magnitudes are calculated from m1 = 6.0 +
5 log Delta + 7.5 log r. The elongation from the sun decreases
from 25 deg on Mar. 20 to 19 deg in early April, and increases
again to 25 deg on Apr. 19 and 54 deg on May 9; the comet will
be near opposition in early June. The accuracy of the orbit by
mid-May should be on the order of 1 deg, though any significant
departure from parabolic motion would increase this uncertainty.
1990 ET R.A. (1950) Decl. Delta r m1
Mar. 20 1 35.69 - 0 34.1 1.405 0.660 5.4
25 1 41.39 + 5 13.0
30 1 45.43 +11 36.9 1.247 0.463 4.0
Apr. 4 1 45.87 +18 31.1
9 1 39.59 +25 17.8 1.040 0.350 2.7
14 1 24.75 +30 43.5
19 1 03.63 +34 03.3 0.804 0.438 2.8
24 0 39.51 +35 32.7
29 0 13.42 +35 39.5 0.599 0.630 3.4
May 4 23 44.29 +34 35.7
9 23 09.50 +32 09.6 0.420 0.835 3.5
14 22 25.02 +27 34.8
19 21 26.31 +19 16.5 0.279 1.034 3.3
24 20 12.72 + 5 53.3
29 18 54.43 - 9 32.2 0.257 1.224 3.7
June 3 17 47.28 -21 00.7
8 16 58.00 -27 31.8 0.392 1.405 5.1
1989 December 20 (4926) Daniel W. E. Green
Read IAUC 4927
Our Web policy. Index to the CBAT/MPC/ICQ pages.
