Central Bureau for Astronomical Telegrams
IAUC 4985: 1989c1; 1989d1
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Read IAUC 4986
Circular No. 4985
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)
The orbital elements below, by B. G. Marsden, Center for
Astrophysics, from MPC 16205, are based on observations through Mar.
17, with corresponding 'original' and 'future' 1/a, respectively
(+/- 0.00009, in units of AU**-1): -0.00019, -0.00057.
Epoch = 1990 Apr. 19.0 ET
T = 1990 Apr. 9.9708 ET Peri. = 61.5625
e = 1.000301 Node = 75.2223 1950.0
q = 0.349854 AU Incl. = 58.9574
The predicted magnitudes are from the formula on IAUC 4926:
1990 ET R.A. (1950) Decl. Delta r m1
Apr. 19 1 06.17 +34 04.2 0.810 0.434 2.8
24 0 42.48 +35 42.3
29 0 16.72 +35 58.0 0.601 0.625 3.4
May 4 23 47.82 +35 04.4
9 23 13.08 +32 50.4 0.418 0.830 3.5
14 22 28.19 +28 29.0
19 21 28.10 +20 18.7 0.273 1.029 3.3
24 20 11.89 + 6 41.0
29 18 50.83 - 9 16.4 0.250 1.219 3.6
June 3 17 42.28 -21 00.3
8 16 52.88 -27 32.4 0.388 1.401 5.0
Total visual magnitude estimates (cf. IAUC 4983): Mar. 23.48
UT, 5.8 (A. Pearce, Scarborough, W. Australia, 20x80 binoculars);
24.14, 5.8 (C. S. Morris, Pine Mountain Club, CA, 20x80 binoculars);
26.14, 5.2: (Morris); 26.79, 5.7 (J.-C. Merlin, Le Creusot, France,
0.40-m reflector); 27.05, 5.6 (G. Kronk, Troy, IL, 20x80 binoculars;
tail about 1 deg in p.a. 70 deg).
PERIODIC COMET SCHWASSMANN-WACHMANN 3 (1989d1)
Total visual magnitude estimates: Mar. 19.34 UT, 12.9 (A. Hale,
Las Cruces, NM, 0.41-m reflector); 23.12, 11.6 (B. H. Granslo,
Blindern, Oslo, Norway, 0.20-m reflector); 24.48, 11.9 (C. S. Morris,
Pine Mountain Club, CA, 0.26-m reflector); 26.80, 12.0 (A. Pearce,
Scarborough, W. Australia, 0.41-m reflector).
1990 March 27 (4985) Daniel W. E. Green
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