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IAUC 9264: V556 Ser = N SER 2013 = PNV J18090346-1112345; C/2012 S1

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                                                  Circular No. 9264
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
New postal address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
CBATIAU@EPS.HARVARD.EDU           ISSN 0081-0304
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Prepared using the Tamkin Foundation Computer Network


V556 SERPENTIS = NOVA SER 2013 = PNV J18090346-1112345
     S. Nakano, Sumoto, Japan, reported the discovery by Koichi
Itagaki (Teppo-cho, Yamagata, Japan) of a possible nova (mag 12.3)
on an unfiltered CCD frame taken on Nov. 24.384 UT using a 0.21-m
reflector; the new object is located at R.A. = 18h09m03s.46, Decl.
= -11o12'34".5 (equinox 2000.0).  The variable was designated PNV
J18090346-1112345 when it was posted at the Central Bureau's TOCP
webpage.  Additional CCD magnitudes for the variable communicated
by Nakano:  Nov. 6.375, [15 (Itagaki); 22.370 and 23.361, [13 (T.
Kojima, Tsumagoi, Gunma-ken, Japan); 26.369, 11.7 (Itagaki);
26.373, 12.7 (Kojima).  P. Schmeer (Bischmisheim, Germany) notes
that an apparent star (H = 20.9) in the UKIDSS near-infrared
Galactic Plane Survey has position end figures 03s.433, 34".39.
Optical spectroscopy by U. Munari and P. Valisa on Nov. 25.792 with
a 0.61-m telescope at Varese, Italy, and by R. Itoh, Y. Kanda, Y.
Moritani, and K. S. Kawabata on Nov. 25.37 with a 1.5-m telescope
at the Higashi-Hiroshima Observatory shows the variable to be
clearly a nova with hydrogen Balmer lines (FWHM about 900-1100
km/s) and O I in emission.  Additional photometric and
spectroscopic details are given on CBET 3724.
     E. V. Kazarovets writes that the permanent GCVS designation
V556 Ser has been given to this nova.


COMET C/2012 S1 (ISON)
     M. L. Sitko, University of Cincinnati and Space Science
Institute; R. W. Russell and D. L. Kim, The Aerospace Corporation;
P. Yanamandra-Fisher, Space Science Institute; and D. Griep,
Infrared Telescope Facility (IRTF), report 3- to 13-micron
spectroscopy (resolution R = 30-120; 4".5 circular aperture) of
C/2012 S1 was obtained on Nov. 11 and 12 UT, using The Aerospace
Corporation's Broad-band Array Spectrograph System.  The spectra
exhibited a weak silicate emission feature, being only 10 percent
or less above the underlying continuum with measured temperature T
about 330 K (vs. the equilibrium T = 335 K for r = 0.69 AU), which
was identified by placing a blackbody through the 8- and 13-micron
regions of the spectrum.  The integrated spectral brightness on
Nov. 12 was > or about 50 percent brighter than on Nov. 11,
indicating that the recent observed outburst was being detected at
thermal-infrared wavelengths.  The 10.5-micron magnitude was 1.89
(+0.1, -0.05) on Nov. 11, and 1.37 (+0.10, -0.05) on Nov. 12.
Data in the 3- to 5.5-micron region fell above the blackbody
continuum on both nights, indicating that a range of (hotter) dust
temperatures was present.

                      (C) Copyright 2013 CBAT
2013 November 27               (9264)            Daniel W. E. Green

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