Central Bureau for Astronomical Telegrams
IAUC 4726: 1989B; 1989 AC; 1987A; DX And
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Read IAUC 4727
Circular No. 4726
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
SUPERNOVA 1989B IN NGC 3627
R. O. Evans, Hazelbrook, New South Wales, reports his discovery on
Jan. 30.5 UT of a supernova of mag 13 situated 15" west and 50" north of
the nucleus of NGC 3627 = M66. The presence of a new object of mag 13 was
confirmed by R. H. McNaught with the Uppsala Southern Schmidt at Siding
Spring on Jan. 30.76 UT through thin cloud. McNaught has measured the
object's position as R.A. = 11h17m37s.40, Decl. = +13d16'45".4 (equinox
1950.0), i.e., 15".4 west and 50".3 north of the galaxy's nucleus, or
96".5 east and 58".9 south of BD +13 2389 = SAO 99560.
1989 AC
Photometry by D. J. Tholen with the 0.61-m reflector at Mauna Kea
on Jan. 27.37 UT gave V = 14.6. The magnitude has been adjusted in the
following continuation to the ephemeris on IAUC 4715:
1989 ET R.A. (1950) Decl. Delta r V
Feb. 7 6 30.89 +23 12.7 0.466 1.374 15.4
9 6 35.50 +23 10.9
11 6 39.92 +23 08.6 0.516 1.411 15.7
13 6 44.17 +23 05.9
15 6 48.28 +23 02.7 0.568 1.448 16.0
17 6 52.26 +22 59.2
19 6 56.14 +22 55.3 0.622 1.484 16.2
21 6 59.92 +22 51.1
23 7 03.61 +22 46.6 0.677 1.521 16.5
SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
Visual magnitude estimates: 1988 Nov. 27.58 UT, 10.7 (A. Pearce,
Woodlands, Western Australia); Dec. 11.51, 11.0 (P. Williams, Heathcote,
N.S.W.); 13.45, 10.9 (Williams); 27.44, 11.2 (Williams); 1989 Jan. 3.45,
11.4 (Williams); 8.46, 11.5 (Williams); 10.49, 11.5 (Williams); 11.45,
11.5 (Williams); 15.44, 11.6 (Williams); 17.73, 11.7 (Williams);
DX ANDROMEDAE
Visual magnitude estimates: Jan. 25.80 UT, 11.7 (P. Schmeer,
Bischmisheim, West Germany); 26.73, 11.5 (A. Boattini, Florence, Italy);
27.74, 11.7 (Boattini); 28.80, 11.8 (S. Korth, Dusseldorf, West Germany).
1989 January 30 (4726) Brian G. Marsden
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