IAU Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 4641: Poss. SNe; 1988j

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 4640  SEARCH Read IAUC 4642
IAUC number

                                                  Circular No. 4641
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444

     Two discoveries have tentatively been reported in connection with
the CCD search for supernovae in distant clusters of galaxies
with the Danish 1.5-m telescope at the European Southern Observatory by
L. Hansen, H. U. Norgaard-Nielsen and H. E. Jorgensen (1987, Messenger
No. 47, 46).
     (1) A galaxy (R.A. = 13h41m08s.0, Decl. = -0D16'31".3, equinox
1950.0), probably a member of the cluster J1836.14RC (z = 0.28) found by
R. Ellis and W. Couch, was noted by Hansen to brighten from V = 21.3 on
1987 Mar. 3 to V = 21.1 on 1988 Feb. 16 and 17.  CCD exposures with the
Anglo-Australian Telescope on Feb. 18 and 19 indicated Kron-Cousins R =
21.4 for the galaxy and showed further brightening by 0.18 mag between
these nights.  A spectrogram obtained by J. Allington-Smith with the
4.2-m William Herschel telescope and Durham-RGO faint object
spectrograph at La Palma on Feb. 18 gave a tentative redshift of z =
0.26 for the galaxy (based on weak emission lines) but was too poor to
prove the presence of a supernova.
     (2) Comparison of esposures of the cluster of galaxies AC 118 (z =
0.31) on 1986 Aug. 31 and 1988 Aug. 9 showed on the latter night an
excess of light close to a faint object, presumably a galaxy.  The
excess was confirmed on Aug. 10 and 11 and also by Ellis at La Palma.
The excess, of V = 22.29 +/- 0.10, is 0".45 east and 0".72 south of the
faint galaxy (V = 22.58 on 1986 Aug. 31), which is 55" east and 43"
north of a star of V = 17.9 at R.A. =  0h11m52s.6, Decl. = -30D42'23"
(equinox 1950.0, uncertainty 2").  A weak spectrogram (resolution 8 nm)
obtained (courtesy V. de Lapparent and A. Mazure) with the ESO Faint
Object Spectrograph and Camera and B 1000 grism on the 3.6-m telescope
on Aug. 12 showed the light excess to be blue (essentially constant flux
over 390-700 nm, apparently no emission lines), possibly--although this
has not yet been confirmed--with broad absorption features around
547.5 and 633.0 nm.

     H. Kosai, National Astronomical Observatory, Tokyo, informs us of
the following independent discoveries: Aug. 8.738 UT, Kesao Takamizawa,
Saku-Machi, Nagano; 8.746, Tetsuo Yanaka, Motegi-Machi, Tochigi; 8.754,
Masanori Terasako, Hamamatsu-Shi, Shizuoka; 8.785, Ryoichi Irie,
Toyooka-Shi, Hyogo; 8.794, Shigehisa Fujikawa, Onohara-Mura, Kagawa.
All reported the comet as mag 9, diffuse with central condensation.

1988 August 16                 (4641)              Brian G. Marsden

Read IAUC 4640  SEARCH Read IAUC 4642

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!