[IAUC] IAUC 9098: KT Eri = N Eri 2009 [25139-2010/01-R1]

Mar Dic 1 22:18:24 ART 2009

                                                  Circular No. 9098
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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KT ERIDANI = NOVA ERIDANI 2009
     H. Yamaoka, Kyushu University, reports the discovery by K.
Itagaki (Yamagata, Japan) of a possible nova (mag 8.1) on Nov.
25.536 UT with his 0.21-m patrol system; a confirming image by
Itagaki on Nov. 25.545 (0.60-m reflector) yields position R.A. =
4h47m54s.21, Decl. = -10o10'43".1 (equinox 2000.0), who notes a
faint (mag about 15) object near this position on his archival
patrol images (Yamaoka adds that this blue star has USNO-B1.0
position end figures 54s.19, 42".9).  E. Guido and G. Sostero
measure CCD mag about 8.2 and position end figures 54s.12, 43".1 on
Nov. 26.36 (remotely using a 0.25-m reflector near Mayhill, NM,
U.S.A.).  H. Maehara, Kwasan Observatory, Kyoto University, has
reported several sets of spectroscopic observations made during
Nov. 26.5-26.6 (by Maehara; M. Fujii, Okayama; by A. Arai and M.
Isogai, Kyoto Sangyo University; and by K. Imamura, Okayama
University of Science) that show broad Balmer emission (FWHM of
H_alpha about 3200-3400 km/s), together with He I, N II, N III, Na
I D, O I, and Mg II emission, concluding that the variable appears
to be a nova of the He/N class.  R. J. Rudy, T. R. Prater, and R. W.
Russell, The Aerospace Corporation; R. C. Puetter, University of
California at San Diego; and R. B. Perry, NASA, report on 0.9- to
2.5-micron spectroscopy of the nova, obtained on Nov. 26.4 UT
using the Lick Observatory 3-m Shane reflector, which shows very
strong, broad emission lines (FWHM = 4000 km/s) with very rapid
spectral development, suggesting that this object may be a nova of
the He/N type.  Additional details appear on CBETs 2050, 2053, and
2055.  E. V. Kazarovets reports that the GCVS team has assigned the
designation KT Eri to this nova.
     Wide-angle-lens pre-discovery CCD magnitudes for KT Eri
(Japanese data via Maehara; ASAS-3 V magnitudes via Yamaoka):  Nov.
10.236 UT, [14.0: (ASAS); 14.572 UT, 5.7 (I. Ootsuki, Miyagi, Japan,
Canon EOS 40D camera; measured by O. Ohshima, Okayama); 14.632, 5.4
(image by M. Watanabe and A. Miyashita, Tokyo, Nikon D90 camera;
measured by K. Nagai, Kanagawa, Japan); 14.813, 5.6 (Ootsuki and
Ohshima); 17.226, 6.9 (M. Hankey, Freeland, MD, U.S.A., Canon 20Da
camera; measured by J. E. Bortle, Stormville, NY, U.S.A.); 17.758,
6.7 (T. Tanaka, Mie, Japan, Canon EOS 50D camera); 17.807, 6.6 (A.
Kawamura, Gunma, Japan; measured by Ohshima); 18.760 and 18.809,
7.0 (M. Yamamoto, Aichi, Japan, Canon EOS Kis camera); 19.241, 7.34
(ASAS); 22.179, 7.98 (ASAS); 24.269, 8.12 (ASAS).  Additional
visual magnitude estimates:  Nov. 27.229, 8.2 (C. Hergenrother,
Tucson, AZ, U.S.A.); 27.427, 8.3 (P. Camilleri, Sydney, Australia);
28.851, 8.2 (W. Vollmann, Vienna, Austria).

                      (C) Copyright 2009 CBAT
2009 December 1                (9098)            Daniel W. E. Green