Central Bureau for Astronomical Telegrams
IAUC 5290: 1991ah; N Her 1991; P/SCHWASSMANN-WACHMANN 1
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 5291
Circular No. 5290
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 or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
SUPERNOVA 1991ah IN ANONYMOUS GALAXY
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."
NOVA HERCULIS 1991
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.
PERIODIC COMET SCHWASSMANN-WACHMANN 1
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
Read IAUC 5291
Our Web policy. Index to the CBAT/MPC/ICQ pages.
