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IAUC 6176: 1995Q; BL Lac; 58P

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                                                  Circular No. 6176
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444 (for emergency use only)

     R. H. McNaught, Anglo-Australian Observatory, reports his
discovery of another supernova (mag about 18) found on an R plate
taken by M. J. Drinkwater with the U.K. Schmidt Telescope on May
31.7 UT and located at R.A. = 20h16m29s.51, Decl. = -43o24'24".6,
which is 20".5 east and 5".1 south of the galaxy's center (offsets
measured from a CCD image obtained with the 1.0-m reflector at
Siding Spring on June 2 by McNaught).  Nothing appears at the
position of the suspect either on the ESO R survey or the SERC J
survey.  Stars of mag 16.5 and 18 have the following respective
position end figures:  27s.57, 41".9; 29s.34, 25'01".8.   The
latter star is about 0.1 mag fainter than the supernova.  R. A.
Stathakis and S. Lee, Anglo-Australian Observatory, obtained a
spectrogram (range 300-1020 nm) with the Anglo-Australian Telescope
on June 1; the spectrum shows this to be a normal type-II supernova,
about 2 months old.

     R. C. Vermeulen, California Institute of Technology (CIT); I.
W. A. Browne, Jodrell Bank and CIT; M. H. Cohen, CIT; R. W. Goodrich,
Space Telescope Science Institute; and P. M. Ogle, A. C. S. Readhead,
and H. D. Tran, CIT, write:  "We report the clear detection of broad
H-alpha line emission in a spectrum of BL Lac taken on May 21.49 UT
at the Hale telescope; this emission was confirmed on June 1.56 at
the Keck telescope.  Preliminary reduction of the May 21 data shows
H-alpha with EW = 0.75 nm and FWHM = 4000 km/s.  [N II] at 658.4 nm
is superimposed; it is unresolved (FWHM </= 600 km/s), has redshift
z = 0.068 and EW = 0.1 nm.  Hints of H-beta and [O III] 500.7-nm
emission need verification and further analysis.  Na I D is the most
prominent absorption feature; other stellar absorption features may
be present also.  Neither spectrogram was taken in photometric
conditions; crude flux calibration, as well as visual inspection of
the guider field at Keck, suggest that the continuum is probably in
a faint state."

     Unfiltered CCD total magnitude reported by J. V. Scotti, Kitt
Peak (0.9-m Spacewatch telescope):  May 22.42 UT, 21.3.  The comet
appeared very nearly stellar, the image being "softer" than nearby
field stars.

1995 June 2                    (6176)            Daniel W. E. Green

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