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IAUC 5765: N Oph 1993; 1993J; BL Lac

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                                                  Circular No. 5765
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


NOVA OPHIUCHI 1993
     Paul J. Camilleri, Cobram, Vic., Australia, reports his
discovery of an apparent nova on T-Max patrol films taken with an 85-
mm camera lens.  The object is located at R.A. = 17h22m.1, Decl. =
-23 09' (equinox 1950.0).  The following magnitude estimates are
available (photovisual unless otherwise noted):  Apr. 1.77 UT, [12
(Camilleri); 14.54, 9.5 (Camilleri); 16.68, 9.5 (Camilleri); 17.50,
9.5 (P. F. Williams, Heathcote, N.S.W.; visual); 17.52, 9.5
(Camilleri; visual).  There is no image visible at this location on
Atlas Stellarum (1970 Apr. 6) or the Union Observatory Prints (1921
June 4) to a limiting mag of 14.  The new object is about 2' east
of a star of mag 10.


SUPERNOVA 1993J IN NGC 3031
     Further photoelectric photometry (cf. IAUC 5750, 5755) by D.
Hanzl, N. Copernicus Planetarium, Brno (H); by B. Kulesza, Olsztyn
Observatory, Poland (K); by M. Mikolajewski, K. Ruminski, and M.
Staniewski, N. Copernicus University, Torun (M); and by P. Prugniel,
Observatoire de Haute Provence (P):  Apr. 13.84 UT, V = 11.07 +/-
0.03, B-V = +0.56 +/- 0.06, V-R = +0.50 +/- 0.05, V-I = +0.42 +/-
0.06 (M); 14.00, Bc = 11.70, Bc-Rc = +0.87 (P); 14.89, V = 10.88
+/- 0.04, B-V = +0.56 +/- 0.07 (H); 14.91, V = 10.82 +/- 0.04, B-V
= +0.55 +/- 0.03 (K); 14.93, V = 10.94 +/- 0.01, U-B = -0.06 +/-
0.04, B-V = +0.51 +/- 0.02, V-R = +0.48 +/- 0.02, V-I = +0.53 +/-
0.02 (M); 15.08, Bc = 11.65, Bc-Rc = +0.89 (P); 16.00, Bc = 11.62,
Bc-Rc = +0.89 (P); 17.00, Bc = 11.63, Bc-Rc = +0.93 (P).  Using HD
86677 (cf. IAUC 5742), Hanzl finds V = 11.24 +/- 0.04, B-V = +0.67
+/- 0.03 for GSC 4383.0565.


BL LACERTAE
     The National Astronomical Observatory in Tokyo has forwarded
the following report from M. Okyudo, Nishi-Harima Astronomical
Observatory: "BL Lac has been highly active since the latter half of
1992, when its magnitude was V about 15.  Recent CCD photometric
observations (Johnson system):  1993 Apr. 5.77 UT, V = 14.58 +/-
0.05; 14.77, 13.78 +/- 0.02.  Comparison stars are 'B' and 'C' of
Smith et al. (1985, A.J. 90, 1184), which are in the same field as
BL Lac."


1993 April 17                  (5765)            Daniel W. E. Green

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