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IAUC 6981: N IN M31; 1998dh; S/1997 U 1

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                                                 Circular No. 6981
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


NOVA IN M31
     M. Modjaz, E. Halderson, T. Shefler, J. Y. King, W. D. Li, R.
R. Treffers, and A. V. Filippenko, University of California at
Berkeley, report their discovery of an apparent nova during the
course of the Lick Observatory Supernova Search (cf. IAUC 6627)
with the 0.8-m Katzman Automatic Imaging Telescope (KAIT).
Available magnitude estimates from unfiltered CCD images: July 23.5
UT, about 16.1; 27.5, about 14.4; 31.5, about 15.6.  The object is
located at R.A. = 0h42m37s.00, Decl. = +41o16'56".7 (equinox
2000.0), which is about 82".4 west and 47".7 north of the nucleus
of NGC 224 (M31).  A KAIT image on July 19.5 does not show a star
at the position of the apparent nova (limiting mag about 18.0).


SUPERNOVA 1998dh IN NGC 7541
     Magnitude estimates, visual unless otherwise noted: July 20.98
UT, 16.8 (S. Massaro, Palermo, Italy, CCD; prediscovery image);
26.48, 14.4  (N. Biver, Oahu, HI); 27.49, 14.2 (Biver); 30.99,
14.60 (D. Rodriguez, Madrid, Spain, CCD + V filter); Aug. 2.0, 14.3
(K. Sarneczky, Agasvar, Hungary).


S/1997 U 1
     Extension to the ephemeris on IAUC 6870:

1998 TT    R. A. (2000) Decl.    Delta    r_U   Elong.  dR.A. dDecl.
July 26   20 54.96   -18 01.8   18.822   0.046  171.7    85-   226+
Aug.  5   20 53.40   -18 07.8   18.816   0.047  178.2    45-   264+
     15   20 51.84   -18 13.7   18.839   0.047  168.3     3-   298+
     25   20 50.36   -18 19.2   18.892   0.047  158.3    38+   329+
Sept. 4   20 49.03   -18 24.2   18.973   0.048  148.3    80+   354+
     14   20 47.88   -18 28.3   19.080   0.048  138.4   121+   375+
     24   20 46.98   -18 31.5   19.209   0.049  128.4   160+   391+
Oct.  4   20 46.37   -18 33.7   19.356   0.049  118.4   197+   402+
     14   20 46.08   -18 34.6   19.518   0.050  108.5   232+   408+
     24   20 46.12   -18 34.2   19.689   0.050   98.5   264+   410+
Nov.  3   20 46.50   -18 32.6   19.865   0.050   88.7   293+   408+
     13   20 47.22   -18 29.7   20.041   0.051   78.8   318+   402+
     23   20 48.27   -18 25.6   20.211   0.051   69.0   339+   393+
Dec.  3   20 49.61   -18 20.3   20.371   0.051   59.2   357+   380+
     13   20 51.23   -18 14.0   20.515   0.051   49.4   370+   364+

                      (C) Copyright 1998 CBAT
1998 August 3                  (6981)            Daniel W. E. Green

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