Peremennye Zvezdy (Variable Stars) 25, No. 1, 2005 Received 2005 December 19; accepted 2005 December 21.

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Missed Supernova 1985 in PGC 2152385

S.V. Antipin^1,2

1. Sternberg Astronomical Institute, 13, University Ave., Moscow 119992, Russia, e-mail: antipin@sai.msu.ru

2. Institute of Astronomy, Russian Academy of Sciences, 48, Pyatnitskaya Str., Moscow 119017, Russia

In the course of the search for new variable stars on the plates of Moscow archive, an unknown supernova was discovered. The star is seen only on five plates taken with the Crimean 40-cm astrograph in September 1985.

The scans of four of the five plates, where the supernova is seen, are shown on Fig.1c-f, side by side with the POSS II blue image (Fig.1a) and the scaned plate without the SN (Fig.1b). Note that the parent galaxy, PGC 2152385, is hardly visible on Fig. 1b or on the other Moscow plates that include the field of the supernova. These four scans were analyzed with the aperture photometry package developed by V.P. Goranskij. Photographic blue magnitudes of neighboring USNO-A2.0 stars (Monet et al., 1998) were used as a photometric standard. The results are given in Table 1. The plate A17129 is not of good quality, the SN brightness on it was estimated by eye with big uncertainty. Unfortunately, the plates closest in time to the SN outburst are separated by many months (see the first and the last lines of Table 1), so we cannot determine the supernova's subtype or say anything about the light curve's shape.

The coordinates of the supernova measured on our plates relative to USNO-A2.0 stars are = 225415, = +393512 3 (J2000.0), that is north and west of the parent galaxy's position in the USNO-A2.0 catalog.

Acknowledgements: The author is grateful to the Russian Foundation of Basic Research (grant No. 05-02-16688) for partial support of this study.

References:

Monet, D. et al., 1998, USNO-A2.0, A Catalog of Astrometric Standards (U.S. Naval Observatory, Washington, DC)