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IAUC 6252: 1995ai; C/1995 O1; Corrs

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                                                  Circular No. 6252
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)

SUPERNOVA 1995ai IN NGC 7794
     C. Pollas, Observatoire de la Cote d'Azur, reports his
discovery on a Tech Pan film taken Oct. 23.94 UT of a supernova (V
about 18.3) at R.A. = 23h58m33s.06, Decl. = +10o43'23".9 (equinox
2000.0), which is 15".7 west and 17".4 south of the center of NGC
7794 (and situated on a large, faint condensation of the southern
arm of this spiral galaxy).  M. Dennefeld, using the 1.2-m
telescope at Observatoire de Haute Provence, estimated the flux
(Cousins R band) of SN 1995ai on Oct. 24.78 UT to be about 2 times
fainter than the flux of each of two nearby stars of mag V about
18.0 having position end figures 35s.18, 51".1 and 36s.42, 32".9.
A third nearby star (V = 15.0) has position end figures 32s.80,
     P. Garnavich, P. Challis, and R. Kirshner, Center for
Astrophysics, write:  "A CCD image obtained with the Mt. Hopkins
1.2-m telescope by N. Caldwell on Oct. 25.3 UT shows SN 1995ai at R
= 17.9.  A low signal-to-noise spectrogram taken by R. Jansen with
the 1.5-m Tillinghast telescope shows a broad H-alpha feature with
a P-Cyg profile, suggesting that this is a type-II supernova.
Strong, narrow H-alpha, [N II], and [S II] lines at a redshifted
velocity of 5100 km/s are superimposed on the spectrum."

     A. Fitzsimmons, Queens University, Belfast, writes:  "Optical
spectra (range 330-830 nm) of C/1995 O1 were obtained on Aug. 30.87
UT at the 4.2-m William Herschel Telescope (slit positioned at p.a.
357 deg, with width 2".4 and length 44").  Subsequent analysis has
revealed the presence of the CN (0-0) 388-nm emission band with a
flux of (1.7 +/- 0.8) x 10E-14 erg sE-1 cmE-2.  Assuming HCN as a
parent, this corresponds to a production rate of Q(CN) approximately
6 x 10E25 molecules/s.  No other emission features were observed."
     Total visual magnitude estimates:
Sept. 28.06 UT, 10.3 (G. W. Kronk, Troy, IL, 0.33-m reflector);
Oct. 1.11, 10.6 (R. Keen, Mt. Thorodin, CO, 0.32-m reflector);
13.00, 9.8 (D. W. E. Green, Harvard, MA, 0.25-m reflector); 22.12,
10.0 (C. S. Morris, Lockwood Valley, CA, 0.26-m reflector).

     The Numbers of IAUCs 6244 and 6245, dated 1995 October 16
 and 18, respectively, were inadvertently cut off in their printing.
     On IAUC 6247, line 11, for  UGC 7122  read  UGC 1722

1995 October 25                (6252)            Daniel W. E. Green

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