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IAUC 6236: 1995aa; C/1995 O1

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                                                  Circular No. 6236
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444 (for emergency use only)

     C. Pollas, Observatoire de la Cote d'Azur (OCA), reports his
discovery on technical pan films obtained with the OCA 0.9-m Schmidt
telescope of an apparent supernova located at R.A. = 22h59m09s.73,
Decl. = -4o30'57".3 (equinox 2000.0), which is 8".1 east and 1".7
south of the galaxy's center (the galaxy itself of mag V about 17.0).
Pollas provides the following V magnitude estimates for SN 1995aa:
Sept. 2.02 UT, 19.8; 16.93, 20.2; 17.96, 20.2.  A faint condensation
(mag about 21.0) is visible at this location on the Palomar Sky
Survey and Digital Sky Survey.  A nearby foreground star (V about
16.5) has position end figures 09s.76, 31'59".2.
     S. Benetti, European Southern Observatory (ESO), reports that
inspection of a noisy CCD spectrogram (range 390.0-925.0 nm,
resolution 3.5 nm), obtained on Sept. 25.05 UT with the ESO 2.2-m
telescope (+ EFOSC2), confirms that SN 1995aa is a peculiar type-IIn
supernova.  H-alpha emission is marginally resolved (peak measured
at 782.4 nm; FWHM = 4.5 nm).  Narrow emission lines of [O III] at
495.9-500.7 nm and He I at 587.6 nm are also present in the
supernova spectrum.  If these lines are at rest in the frame of the
galaxy, a redshift of 0.19 is deduced.

     H. Rauer, Observatoire de Paris-Meudon (OPM); D. Despois,
Observatoire de Bordeaux; R. Moreno and G. Paubert, Institut de
Radio Astronomie Millimetrique (IRAM), Granada; and N. Biver, D.
Bockelee-Morvan, P. Colom, J. Crovisier, and L. Jorda, OPM, report
observations of the CO J(2-1) line at 230 GHz with the IRAM 30-m
telescope:  "The line was already marginally present in the average
of Aug. 16 and 23 data, with an area of 0.087 +/- 0.018 K km sE-1
(antenna temperature scale).  For the average of Sept. 20 and 21
data, the line was blueshifted by 0.33 km/s and had an area of
0.041 +/- 0.003 K km sE-1 and a width of 0.40 km/s.  This
corresponds to a CO production rate of about 2 x 10E28 sE-1,
assuming a CO rotational temperature of 10 K, as was measured in
29P/Schwassmann-Wachmann 1 (Crovisier et al. 1995, Icarus 115, 213).
The CO J(1-0) line could not be detected at the 3-sigma level of
0.03 K km sE-1."
     Total visual magnitude estimates:  Sept. 16.84 UT, 9.9 (J.
Carvajal, Madrid, Spain, 0.21-m reflector); 17.16, 10.1 (C. S.
Morris, Pine Mtn. Club, CA, 0.26-m refl.); 21.17, 11.2 (Morris);
22.85, 11.1 (Carvajal, 0.44-m refl.); 23.15, 11.3 (Morris); 23.84,
9.8 (Carvajal); 24.19, 10.8 (Morris).

1995 September 25              (6236)            Daniel W. E. Green

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