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IAUC 5577: 1992at; GK Per; N Sgr 1992 No. 2

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                                                  Circular No. 5577
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

     R. H. McNaught, Anglo-Australian Observatory, reports his
discovery of an apparent supernova (mag about 18) in an anonymous
barred spiral galaxy.  M. Hartley exposed both the discovery B
plate on Aug. 2.5 UT and the confirmatory U plate on Aug. 4.6 with
the U.K. Schmidt Telescope.  The supernova is located at R.A. =
21h24m03s.88, Decl. = -37 13'01".7 (equinox 1950.0; uncertainty
0".4 in R.A., 0".5 in Decl.), just beyond the end of a spiral arm,
with offsets from the galaxy's center being 5".6 east, 10".9 south.
A nearby star about 0.5 mag brighter than the supernova has end
figures 09s.97, 12'41".2.

     F. C. Bruhweiler, Catholic University of America; and J. C.
Wheeler, University of Texas, report:  "Spectra (range 120-320 nm)
obtained on Aug. 5 with the International Ultraviolet Explorer
(IUE) SWP and LWP cameras show an increase in the ultraviolet flux
of GK Per by a factor of 25 from its quiescent levels.  These
ultraviolet flux levels are comparable to those observed near maxima
from previous outbursts of this nova.  Besides a strong ultraviolet
continuum, the spectrum shows strong emission from He II (164.0 nm),
as well as weak C IV (154.9 nm) and N V (124.0 nm).  The IUE Fine
Error Sensor indicates magnitude V about 10.  Further IUE
observations are planned."
     G. Emerson, E. E. Barnard Observatory, reports V = 10.17 +/-
0.18 as observed with a CCD on July 28.406 UT.  Visual magnitude
estimates (cf. IAUC 5558):  June 29.043 UT, 13.0: (P. Schmeer,
Bischmisheim, Germany); July 8.079, 11.5 (Schmeer); 9.37, 10.8 (M.
Adams, Melbourne, FL); 14.063, 10.7 (A. Boattini, Florence, Italy);
22.05, 10.7 (A. Mizser, Budapest, Hungary); 23.01, 10.6 (E.
Schweitzer, Strasbourg, France); 28.95, 10.3 (B. H. Granslo,
Fjellhamar, Norway); Aug. 3.99, 10.3 (Granslo).

     D. Hanzl reports the following photometry obtained with the
0.4-m telescope at the N. Copernicus Observatory and Planetarium,
Brno, under non-photometric conditions:  July 21.915 UT, V = 9.12
+/- 0.1, B-V = +0.40 +/- 0.18 (comparison star lambda Sgr).

1992 August 5                  (5577)            Daniel W. E. Green

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