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IAUC 5595: 1992av; V1727 Cyg; N Cyg 1992

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                                                  Circular No. 5595
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,
on OCA Schmidt technical pan films taken Aug. 21.96 and 22.97
UT (limiting mag 21), of an apparent supernova (V about 20) located
at R.A. = 17h43m14s.55, Decl. = +67 50'20".6 (equinox 1950.0).  SN
1992av is 10".9 east and 4".6 north of the center of a galaxy of
mpg about 18, and it is near the east tip of the galaxy's thin
disk, the disk being only visible on deeper films (limiting mag 22)
obtained one year ago.  Nothing is visible at this location on the
POSS prints.  A nearby star (V = 16.5) has end figures 16s.19,
51'13".7.  M. Turatto and S. Benetti report that SN 1992av was at
magnitudes B = 18.9, V = 18.6, and R = 18.7 when observed on Aug.
24.0 with the Asiago Observatory 1.8-m telescope (+ CCD).

     L. Molnar and M. Neely, Department of Physics and Astronomy,
University of Iowa, write:  "Using the 0.61-m reflector (+ CCD) at
Riverside Observatory, we observed V1727 Cygni = 4U 2129+47 on Aug.
17 and 20, finding magnitude V = 18.2 +/- 0.2, which is consistent
with earlier measurements in quiescence.  We also find no orbital
modulation > 0.3 mag full amplitude in nine measurements through a
clear filter spanning the orbital phases 0.16-0.75.  We conclude
that the recently detected x-ray emission from this source (cf.
IAUC 5578) is likely a detection of low-state emission that has
persisted since 1983, rather than an indication of a recent
increase in emission."

     C. E. Woodward, R. A. Hermann, and T. A. Calovini, University
of Wyoming, report the following infrared magnitudes, obtained using
a bolometer on the 2.3-m Wyoming Infrared Observatory telescope
on Aug. 15.35 UT:  K = 7.97 +/- 0.08, L = 6.99 +/- 0.16, M = 6.14
+/- 0.24, N = 4.51 +/- 0.40, [11.4 microns] = 3.45 +/- 0.23, [12.6
microns] = 2.03 +/- 0.18.
     G. F. Lawrence, University of Minnesota, provides the following
infrared magnitudes of Nova Cyg 1992 obtained by C. Kobulnicky,
A. Paulson, and himself with the 0.75-m telescope (+ InSb detector)
at the O'Brien Observatory on Aug. 19.22 UT: J = 8.38 +/- 0.02, H =
8.43 +/- 0.02, K = 7.78 +/- 0.02.

1992 August 26                 (5595)            Daniel W. E. Green

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