IAU Central Bureau for Astronomical Telegrams

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IAUC 8479: 2005ab, 2005ad; 2005W; C/1995 O1; N IN M31

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IAUC number

                                                  Circular No. 8479
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

SUPERNOVAE 2005ab AND 2005ad
     Further to IAUC 8478, S. Nakano reports the discovry by K.
Itagaki of an apparent supernova (red mag 17.4) on numerous
unfiltered CCD frames taken around Feb. 6.402 UT; Itagaki reports
the new object at mag 16.6 on a CCD image taken on Feb. 7.434.  SN
2005ad is located at R.A. = 2h28m29s.45, Decl. = -1o08'20".0
(equinox 2000.0), which is 23" east and 45" north of the center of
NGC 941.  Nothing is visible at this location on CCD frames taken
by Itagaki on Jan. 8 (limiting mag 19) and on 2003 Sept. 28 and
earlier (limiting mag 19.5); it is also absent from an unspecified
Digitized Sky Survey image.
     Further to IAUC 8478, Nakano reports that Itagaki found SN
2005ab at mag 16.8 on a CCD image taken on Feb. 6.644 UT.

     N. Elias-Rosa, H. Navasardyan, A. Harutunyan, S. Benetti, and
M. Turatto, Osservatorio Astronomico di Padova; A. Pastorello, Max-
Planck-Institut; and F. Patat, European Southern Observatory, on
behalf of the European RTN (IAUC 7987), report that a spectrogram
of SN 2005W (cf. IAUC 8475), obtained on Feb. 2.7 UT with the
Asiago 1.8-m telescope (+ AFOSC; range 355-780 nm, resolution 2.4
nm), shows it to be a type-Ia supernova about a week before maximum.
The spectrum closely resembles that of SN 2002bo (Benetti et al.
2004, MNRAS 348, 261) at comparable phase.  The expansion velocity
deduced from the Si II 635.5-nm minimum is about 11600 km/s
(adopting the NED recession velocity of 2665 km/s for NGC 691).

     A. Rivkin and R. Binzel, Massachusetts Institute of Technology,
report that images of C/1995 O1 obtained on Jan. 8 with the
Magellan Observatory's Clay 6.5-m telescope (+ SDSS g', r', and i'
filters) show a tail at least 8".5 long (through g' and r' filters)
and the following coma magnitudes in a 4".2 aperture:  g' = 20.73,
r' = 20.33, i' = 20.06.

     Additional R-band magnitudes by K. Hornoch of the nova
announced on IAUC 8461:  Jan. 11.719 UT, 15.16; 13.905, 15.04;
15.702, 15.27; 16.900, 15.34; 19.827, 15.50; 23.734, 15.80; 27.774,
16.61; 30.712, 17.17.

                      (C) Copyright 2005 CBAT
2005 February 7                (8479)            Daniel W. E. Green

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