Central Bureau for Astronomical Telegrams
IAUC 4487: 1987y; 1987n; 1987s; N Her 1987
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Circular No. 4487
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 LEVY (1987y)
No accurate astrometry since Oct. 21 has been reported.
Following is an extended ephemeris from the elements on IAUC 4476.
1987 ET R. A. (1950) Decl. Delta r m1
Nov. 11 17 03.75 +10 46.5 1.985 1.403 11.0
16 17 21.42 + 9 47.8
21 17 37.71 + 8 55.0 2.178 1.564 11.6
26 17 52.78 + 8 08.4
Dec. 1 18 06.76 + 7 28.0 2.379 1.721 12.2
6 18 19.81 + 6 53.4
11 18 32.01 + 6 24.3 2.581 1.874 12.8
16 18 43.47 + 6 00.5
21 18 54.27 + 5 41.5 2.778 2.024 13.3
26 19 04.48 + 5 27.0
31 19 14.13 + 5 16.7 2.965 2.169 13.7
Total visual magnitude estimates: Oct. 19.74 UT, 9.6 (W.
Hasubick, Buchloe, W. Germany, 14x100 binoculars); 21.09, 9.4 (R.
Keen, Mt. Thorodin, CO, 0.15-m refl.); 24.79, 11.2 (J. D. Shanklin,
Cambridge Observatory, 0.33-m refl.); Nov. 9.06, 11.0 (Keen, 0.32-m
refl.); 12.13, 12.5: (C. Morris, Whitaker Peak, CA, 0.26-m refl.).
PERIODIC COMET HARRINGTON (1987n)
Total visual magnitude estimates by A. Hale, Las Cruces, NM
(0.41-m refl.): Oct. 16.17 UT, 13.2; 20.21, 13.3; Nov. 11.12, 13.3.
COMET BRADFIELD (1987s)
Total visual magnitude estimates (B = binoculars): Nov. 4.10
UT, 5.6 (C. Spratt, Victoria, BC, 11x80 B); 5.98, 5.6 (G. Chester,
Arlington, VA, 7x50 B); 10.11, 5.6 (Morris, near Mt. Wilson, CA,
20x80 B); 11.41, 5.5 (Y. Sugiyama, Hiratsuka, Japan, 0.16-m refl.);
12.10, 5.6 (J. Scotti, Tucson, AZ, 10x50 B; tail length about 7 deg);
12.98, 5.7 (J. DeYoung, Washington, DC, 9x63 B).
NOVA HERCULIS 1987
Visual magnitude estimates: Oct. 17.81 UT, 13.2 (S. Korth,
Monheim, W. Germany); 28.39, 13.5 (S. Sakuma, Kawasaki, Japan);
Nov. 3.72, 13.3 (A. Boattini, Florence, Italy).
1987 November 13 (4487) Daniel W. E. Green
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