Central Bureau for Astronomical Telegrams

IAUC 5809: 1993Q; 1993J

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                                                  Circular No. 5809
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


SUPERNOVA 1993Q IN ANONYMOUS GALAXY
     R. H. McNaught, Siding Spring, reports his discovery of a
supernova (mag 19) on a U.K. Schmidt Telescope R plate taken on May
28.8 UT by M. Hartley.  The supernova is located at R.A. =
20h32m24s.61, Decl. = -42 57'57".7 (equinox 1950.0); the galaxy's
nucleus is located at (end figures) 23s.76, 54".9, and a star of
mag 18.5 is at 22s.76, 43".4.  The positions are probably good to
+/- 1".5, as the object is situated in the corner of the plate.
The supernova is not present on SERC J or ESO R surveys.
     M. Della Valle, European Southern Observatory, reports:  "The
analysis of a spectrogram (range 400-840 nm, resolution about 2 nm),
obtained at La Silla with the New Technology Telescope on May 30.3
UT (under non-photometric conditions, reveals this object to be a
type-Ia supernova 2-3 weeks past maximum.  The expansion velocity
deduced from the minimum of the Si II 635-nm absorption is about
9000 km/s."


SUPERNOVA 1993J IN NGC 3031
     S. Benetti and R. Barbon, Asiago Astrophysical Observatory,
communicate:  "A CCD grating spectrum of SN 1993J at 2.3-nm
resolution, taken on May 28.89 UT with the 1.82-m Cima Ekar telescope,
shows a complex structure with conspicuous emissions at 864.8 (Ca
II IR), 777.3 (O I), 728.2 (Ca II]), 704.2 ([Fe II]?), 663.7 and
647.3 (structured H-alpha), 626.0 ([O I]), 586.8 (Na I with a
strong P-Cyg profile), and 553.4 nm ([O I]?, [Fe II]?).  Many
fainter emissions are also seen in the blue region up to H+K Ca II
absorption at 383.7 nm.  Also H-beta seems to show the same H-alpha
structure, although blends with the Fe II lines cannot be excluded.
The appearance of forbidden lines of [O I] and Ca II] suggests that
the supernova is already entering the nebular phase."
     Further photoelectric photometry by H. Mikuz, B. Dintinjana,
and T. Zwitter, Ljubljana, Slovenia (cf. IAUC 5796):  Apr. 8.90, B
= 12.08 +/- 0.01, V = 11.64 +/- 0.03, R = 11.12 +/- 0.01, I = 11.02
+/- 0.03; 17.90, -, -, 10.46 +/- 0.02, 10.37 +/- 0.02; 17.97, 11.37
+/- 0.02, 10.80 +/- 0.01, 10.44 +/- 0.03, 10.41 +/- 0.03; 20.93,
11.74 +/- 0.01, 10.83 +/- 0.01, 10.56 +/- 0.03, 10.41 +/- 0.03;
22.86, 11.82 +/- 0.05, 11.04 +/- 0.02, 10.69 +/- 0.03, 10.51 +/-
0.03; 23.91, 12.01 +/- 0.02, 11.13 +/- 0.01, 10.65 +/- 0.02, 10.34
+/- 0.04; 26.88, 12.46 +/- 0.05, 11.43 +/- 0.02, 10.92 +/- 0.02, -;
May 17.89, 13.47 +/- 0.04, 12.37 +/- 0.02, 11.77 +/- 0.01, 11.29
+/- 0.03; 22.94, 13.67 +/- 0.05, 12.43 +/- 0.02, 11.83 +/- 0.02,
11.47 +/- 0.03.


1993 May 31                    (5809)            Daniel W. E. Green

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