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IAUC 6433: 1995be; C/1996 B2; SS Lac

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IAUC number

                                                  Circular No. 6433
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 an apparent supernova on films taken on 1995 July 18
and Aug. 29 for the U.K. Schmidt Supernova Search by M. Hartley and
M. J. Drinkwater; SN 1995be is present at the same brightness (mag
about 19) on both R films, but it is not present on films taken on
1996 Mar. 21, May 9, and 25, or on the second Palomar Sky Survey R
photograph taken on 1992 Mar. 14.  The position of SN 1995be from
the Aug. 29 film is R.A. = 15h58m14s.30, Decl. = +19o46'06".5
(equinox 2000.0), which is 16" east and 6" north of the galaxy's

     C. Lisse, M. Mumma, and R. Petre, NASA Goddard Space Flight
Center; and K. Dennerl, J. Englhauser, J. Schmitt, and J. Truemper,
Max-Planck-Institut fur Extraterrestrische Physik, Garching,
communicate:  "Comet C/1996 B2 was observed after its perihelion
passage with the ROSAT High Resolution Imager from June 22.10 to
23.77 UT (when Delta = 1.16 AU, r = 1.35 AU, and visual m1 = 7.1)
for 8900 s.  The image, corrected for the proper motion of the
comet, shows an extended source with a radial extent of at least 8'
(400 000 km).  The peak surface brightness was at 0.002 count sE-1
arcminE-2, approximately a factor of 5 lower than during the
previous ROSAT observations in March (IAUC 6373).  The
reacquisition of C/1996 B2 after perihelion confirms the continuous
behavior of x-ray emission in the comet.  ROSAT will continue to
observe the comet until Sept. 8.  The scheduled observation times
will be posted at URL
http://www.rosat.mpe-garching.mpg.de/~jer/comets/; simultaneous
observations at other wavelengths (especially extreme ultraviolet
and radio) are encouraged."

     R. P. Stefanik, G. Torres, J. R. Caruso, and R. J. Davis,
Harvard-Smithsonian Center for Astrophyiscs, report:  "An echelle
spectrogram of SS Lac taken on July 6.20913 UT with the 1.5-m Wyeth
Telescope at Oak Ridge Observatory clearly shows a double-lined
spectrum, confirming the report on IAUC 6429.  The velocities for
the two components were +18 and -67 km/s."

                      (C) Copyright 1996 CBAT
1996 July 12                   (6433)            Daniel W. E. Green

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