Electronic Telegram No. 2127
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
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M31N 2010-01a
     Kamil Hornoch, Astronomical Institute, Ondrejov; Jose Prieto, Carnegie
Observatories; Rubab Khan, Department of Astronomy, Ohio State University;
and Ondrej Pejcha, Department of Astronomy, Ohio State University, report
low-resolution optical spectroscopy (range 400-750 nm, resolution 1.4 nm)
and optical photometry of M31N 2010-01a (cf. CBET 2124).  Spectra were
obtained using the Boller & Chivens CCD Spectrograph on the 2.4-m Hiltner
telescope at MDM Observatory; a spectrogram taken by Prieto and Khan on Jan.
13.08 UT (only 1.95 days after its first optical detection by Burwitz et al.)
exhibits a blue continuum with H-alpha, H-beta and Fe II lines with prominent
P-Cyg profiles.  The FWZI of the emission component of H-alpha is about 2500
km/s.  This suggests that the object is an "Fe II"-class nova in its early
stages of evolution.  Sloan magnitudes were measured by Hornoch from images
taken by Prieto and Khan with RETROCAM on the 2.4-m Hiltner telescope:
Jan. 13.106, g' = 16.15 +/- 0.08; 13.110, r' = 15.94 +/- 0.04.  In addition,
they obtained (from a co-added 300-s Sloan r' image) the following position
for 2010-01a:  R.A. = 0h42m56s.73, Decl. = +41d17'21".2 (equinox 2000.0;
offset from the center of M31:  140" east, and 73" north), in agreement with
the position on CBET 2124; Hornoch adds that nothing is present at this
position down to R = 21.3 on a co-added 1560-s R-band CCD frame taken during
software tests by P. Kubanek, J. Gorosabel, P. Martorell, and M. Jelinek with
the 1.23-m telescope at Calar Alto on 2010 Jan. 2.799 UT.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2010 CBAT
2010 January 16                  (CBET 2127)              Daniel W. E. Green