From quai@eps.harvard.edu Thu Nov 28 03:55:52 2013 Date: Wed, 27 Nov 2013 21:37:56 +0000 (UTC) From: quai@eps.harvard.edu To: BIBLIO@arcetri.astro.it Subject: IAUC 9264: V556 Ser = N SER 2013 = PNV J18090346-1112345; C/2012 S1 [27390-2012/01-R9] 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 URL http://www.cbat.eps.harvard.edu/index.html 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