Central Bureau for Astronomical Telegrams
IAUC 4836: N Sco 1989; V745 Sco; 1988ab; 1989o
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Circular No. 4836
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
NOVA SCORPII 1989
W. Liller, Vina del Mar, Chile, reports his discovery of another
nova on three PROBLICOM exposures during the Aug. 17 lunar
eclipse. The position is R.A. = 17h48m.6, Decl. = -32d31' (equinox
1950.0), 62' northwest of V745 Sco. Magnitude estimates from 2415
film: Aug. 8.02 UT, [15.0; 9.01, [12.0; 17.11, 10.0; 18.02, 9.4 (with
red filter).
V745 SCORPII
H.-J. Tucholke, H. W. Duerbeck and T. Augusteijn, Astronomical
Institute, Munster, and European Southern Observatory, communicate the
following position, measured from a film copy of the Harvard plate of
1937 May 10: R.A. = 17h52m04s.62 +/- 0s.09, Decl. = -33d14'29".3 +/-
0".7 (equinox 1950.0). This confirms the identity of the 1937 object
with the current one (cf. IAUC 4820, 4821), for which measurements from
four GPO astrograph plates (1989 Aug. 4 and 10) and reductions using
the same 16 SAO reference stars yield end figures 04s.67 +/- 0s.03,
30".9 +/- 0".3.
Measurements by C.-Y. Shao, Center for Astrophysics, of the original
plate of 1937 May 10 (8 SAO stars) yield end figures 04s.64, 28".4.
SUPERNOVA 1988ab IN NGC 762
M. Richmond, Astronomy Department, University of California at
Berkeley, reports his discovery of a supernova 33" west and 5" north
of the nucleus of NGC 762, at the outer edge of a spiral arm. The
following magnitudes (+/- 0.2) are available: 1988 Dec. 4.2 UT, 15.6
(R filter), 1989 Jan. 3.2, 17.9 (no filter), Aug. 11.5, [19.1 (R filter).
Maximum brightness probably occurred before the first observation.
PERIODIC COMET BRORSEN-METCALF (1989o)
Total visual magnitude estimates: Aug. 12.10 UT, 6.3 (R.
Haver, Tolfa, Italy, 15 x 80 binoculars; 0.7-deg tail in p.a. 290
deg); 13.08, 6.0 (F. Van Loo, Genk, Belgium, 8 x 30 binoculars);
14.2, 6.5 (M. Kidger, La Palma, Canary Islands, 12 x 50
binoculars); 15.50, 6.0 (C. S. Morris, La Canada, CA, 10 x 50
binoculars); 17.07, 6.1 (J. D. Shanklin, Cambridge, England, 10 x 80
binoculars; during lunar eclipse); 18.32, 6.2 (D. W. E. Green,
Cambridge, MA, 20 x 80 binoculars).
1989 August 18 (4836) Brian G. Marsden
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