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IAUC 4868: 1989Q; H2356-309; N Sct 1989

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                                                Circular No. 4868
Central Bureau for Astronomical Telegrams
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

     C. Pollas, Observatoire de la Cote d'Azur, reports his discovery
of an apparent supernova (mag 19.5) on Schmidt 153-01 plates
exposed on Sept. 26.02 and 28.00 UT.  Nothing appears on an older
Caussols Schmidt plate, nor on the Palomar Sky Survey prints.  The
supernova is located at R.A. = 1h42m48.98, Decl. = +21 50'16.6, and
the galaxy at R.A. = 1h42m49.10, Decl. = +21 50'12.0 (equinox 1950.0).
There is a nearby red star (mag 18) at R.A. = 1h42m49.23, Decl. =
+21 49'23.6.

     R. Falomo, Osservatorio Astronomico di Padova, writes:  "Low-
resolution spectra (400-750 nm) of the x-ray-selected BL-Lac object
H2356-309 (Schwartz et al. 1989, in BL Lac Objects, Springer-Verlag)
were obtained at the European Southern Observatory 1.52-m telescope
(+ CCD) on Aug. 9 and 10, using the finding chart provided by D.
Schwartz.  Weak absorption features are clearly apparent on a
nonthermal continuum:  alpha(nu) = -1.7; V = 17.3.  Identification with
Ca II (H and K), the Fraunhofer G band (430.9 nm), and Mg I b yields
z = 0.17 for the underlying galaxy.  A short exposure (ESO 3.6-m
telescope + EFOSC) without filter clearly shows the presence of the
host galaxy."

     W. Wenzel, Sonneberg Observatory, telexes the following photographic
magnitudes:  Sept. 6.851 UT, 12.0; 7.826, 11.0; 8.857, 10.5;
18.790, 9.5; 20.796, 10.3; 22.807, 10.5.
     R. Monella, Covo, Italy, telexes the following photoelectric
magnitudes:  Sept. 27.856 UT, V = 10.02, B-V = +0.15, U-B = -0.76;
Sept. 28.824, 10.11, +0.21, -0.81.
     Visual magnitude estimates:  Sept. 24.86 UT, 10.5 (P. Schmeer,
Bischmisheim, West Germany; revision to IAUC 4865, using AAVSO
sequence for V603 Aql); 25.84, 10.4 (Schmeer); 26.40, 10.5 (T. Kato,
Kyoto, Japan); 26.90, 10.0 (A. Pereira, Cabo da Roca, Portugal);
27.80, 9.7 (Schmeer); 27.84, 10.2 (S. Korth, Dusseldorf, W. Germany);
27.91, 9.7 (Pereira).

1989 September 29              (4868)             Daniel W. E. Green

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