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IAUC 5290: 1991ah; N Her 1991; P/SCHWASSMANN-WACHMANN 1

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                                                  Circular No. 5290
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

     J. Maza, University of Chile; and M. M. Phillips, Cerro Tololo
Interamerican Observatory, report:  "Roberto Antezana (University of
Chile) has discovered a supernova located about 5" west and 6" north
of the nucleus of an anonymous galaxy at R.A. = 22h07m01s.7, Decl. =
-46 34'10" (equinox 1950.0).  The supernova (mpg about 18.5) was
found on a 20-min unfiltered IIa-O plate taken by M. Hamuy (CTIO)
with the CTIO Curtis Schmidt telescope on June 9.379 UT.  Confirmation
was made by M. Navarrete (CTIO) from a CCD image obtained on
June 13.25 with the CTIO 0.9-m telescope.  A CCD spectrum (range
551.5-1020.0 nm) obtained on June 13.26 by Phillips with the CTIO
4.0-m telescope shows that this is a type-II supernova with strong
and relatively narrow (1400 km/s FWHM) H-alpha emission at a
measured redshift of 0.037."

     R. Russell and M. Chatelain, Space and Environmental Techology
Center, The Aerospace Corporation, report the following magnitudes
obtained with the Univerisity of Minnesota 1.5-m telescope at Mt.
Lemmon with a CVF and broadband system (15" aperture):  May 17.4 UT,
K' (2.28 microns) = 7.47 +/- 0.02, L' (3.6 microns) = 5.05 +/- 0.02,
and a 3-sigma upper limit at 9.2 microns (narrowband) of 0.25 mag.
The K'-L' color temperature was 820 K.  On May 18.4, K' = 7.57 +/-
0.04, L' = 5.08 +/- 0.04, and M' (4.6 microns) = 4.6 +/- 0.15.  The
K'-L' color temperature was 805 K.  The CVF spectrophotometry from 3
to 4 microns showed no strong lines and a continuum consistent with
the filter photometry.

     A. Cochran writes:  "We have started a program, to continue
through 1992 April, to obtain groundbased visible and spacebased
ultraviolet spectra of P/Schwassmann-Wachmann 1 when it is in strong
outburst.  We ask that observers who detect this comet at magnitude
brighter than V = 14 contact us as soon as possible after observing
it:  Anita or William Cochran, telephone 512-471-1471 or -6474, e-
mail anita or wdc@astro.as.utexas.edu; or Alan Stern, telephone
303-492-7669, SPAN e-mail CYGNUS::ASTERN."

1991 June 13                   (5290)             Daniel W. E. Green

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