Central Bureau for Astronomical Telegrams
IAUC 5818: 1993U, 1993V; 1993R; N Aql 1993
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Circular No. 5818
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)
SUPERNOVAE 1993U AND 1993V IN ANONYMOUS GALAXIES
C. Pollas, Observatoire de la Cote d'Azur, reports his discovery
of two apparent supernovae found on a single B plate taken June
16.9 UT with the OCA Schmidt telescope by D. Albanese and himself.
The supernova candidates also appear on a film taken on June 19.9.
SN 1993U (magnitude Bj about 19.5) is located at R.A. =
15h23m44s.62, Decl. = +50 45'07".4 (equinox 1950.0), which is 8".4
east and 6".6 north of the host galaxy's nucleus, the galaxy having
mpg about 18.5. There is a nearby star of mpg about 14 with end
figures 44s.81, 55".5. SN 1993V (Bj about 19) is located at R.A. =
15h29m32s.06, Decl. = +50 27'56".6, which is 6".9 west and 16".3
south of the nucleus of a galaxy of mpg about 18. A nearby star of
B about 16 has end figures 27s.44, 26'56".2. Palomar Sky Survey
prints show no objects to blue mag 20.5 and to red mag 20 for both
supernovae. M. Dennefeld obtained several CCD images on June 21
with the 1.2-m telescope at Observatoire de Haute-Provence under
nonphotometric conditions, showing SN 1993U to be very blue and SN
1993V to be red.
SUPERNOVA 1993R IN NGC 7742
B. Leibundgut and W. Vacca, University of California Berkeley,
report that preliminary inspection of unreduced spectrograms (range
350-510 and 540-1000 nm), obtained on June 19.45 UT with the 3-m
Shane Telescope at Lick Observatory, show SN 1993R (cf. IAUC 5812)
in an advanced stage. Broad nebular lines of Ca II (850 nm), [Ca
II] (730 nm) and [O II] (732 nm), [O I] (630 nm), and [O III] (501
nm) are seen as strong emissions. Broad H-alpha is also detected,
indicating that this supernova is of type II. The line is, however,
relatively weak compared to the other emissions and blended
with narrow emission from the galaxy.
NOVA AQUILAE 1993
Further photoelectric photometry (comparison star HR 7313, cf.
IAUC 5794): May 26.285 UT, V = 8.00, B-V = +0.44 (D. H. Kaiser,
Columbus, IN); 27.267, 8.11, +0.41 (Kaiser); June 18.99, 10.16 +/-
0.03, +0.22 +/- 0.05 (H. Mikuz, Ljubljana, Slovenia); 19.94, 10.29
+/- 0.03, - (Mikuz). Kaiser notes that SAO 124400, the 9th-magnitude
star to the nova's west, varies by at least 0.05 mag over 9
days, though it has evidently not been reported previously as variable.
1993 June 21 (5818) Daniel W. E. Green
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