Central Bureau for Astronomical Telegrams
IAUC 4378: 1987H; 1987A; OJ 287; CH UMa
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Circular No. 4378
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
SUPERNOVA 1987H IN NGC 5363
H. Kosai, Tokyo Astronomical Observatory, telexes the discovery
by M. Koishikawa, at Sendai Observatory's Ayashi Station, of a
supernova in NGC 5363 (R.A. = 13h53.6, Decl. = +5 29', equinox 1950.0);
the object was at mpg = 13 on Mar. 30 and Apr. 27. Kosai reports
his confirmation on Apr. 29.6 UT (mag 13) at Kiso Observatory.
SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
T. Girard and W. van Altena, Astronomy Department, Yale University,
write: "We have measured the position of SN 1987A on plates
taken by C. E. Lopez (University of San Juan, Argentina) with the
Yale Southern Observatory's 0.5-m double astrograph located at El
Leoncito. Making use of two sets of plates taken on 1973 January 9
and 1987 March 4, we obtained the following position: R.A. =
5h35m49s.969 +/- 0s.004, Decl. = -69 17'57.92 +/- 0".03 (equinox 1950.0).
The position is with respect to 34 Perth-70 stars measured on the
1973 epoch plates. A secondary reference frame based on 25 stars
in the LMC was used to transform the SN position to these first
epoch plates. Stars 1 and 2 of Sk -69 202 form a blended image on
the first epoch yellow plate. Offsets from the photocenter of the
blend were calculated assuming a magnitude difference of 1.5 mag in
the visual band. The positional coincidence between the SN and star 1
was found to be Delta(R.A.) = +0s.003 +/- 0s.012, Delta(Decl.) = -0".07
+/- 0".09 (in the sense SN - star 1), where the uncertainties are
dominated by those of Sk -69 202 on our 1973 plates."
OJ 287
Visual magnitude estimates (cf. IAUC 4325): Mar. 20.41 UT,
15.1 (R. Monella, Covo, Italy); 24.42, 15.4 (Monella); 26.43, 15.6
(Monella); 26.83, 15.2 (M. Verdenet, Bourbon-Lancy, France).
CH URSAE MAJORIS
Visual magnitude estimates: Mar. 18.40 UT, 12.7 (R. Monella,
Covo, Italy); 20.86, 14.0 (M. Verdenet, Bourbon-Lancy, France);
24.45, 12.5 (Monella); 26.43, 12.4 (Monella); 26.82, 12.8
(Verdenet); 28.82, 12.5 (Verdenet); Apr. 1.13, 14.3 (Verdenet).
1987 April 29 (4378) Daniel W. E. Green
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