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IAUC 4378: 1987H; 1987A; OJ 287; CH UMa

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                                                  Circular No. 4378
Central Bureau for Astronomical Telegrams
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

     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.

     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).

     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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