Central Bureau for Astronomical Telegrams
IAUC 9119: V2674 OPHIUCHI = NOVA OPHIUCHI 2010 No. 2; COMET 233P/LA SAGRA
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Circular No. 9119
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director: D. W. E. Green, Room 209; Department of
Earth and Planetary Sciences; Harvard University;
20 Oxford St.; Cambridge, MA 02138; U.S.A.
CBAT@IAU.ORG; CBATIAU@EPS.HARVARD.EDU
URL http://www.cfa.harvard.edu/iau/cbat.html ISSN 0081-0304
V2674 OPHIUCHI = NOVA OPHIUCHI 2010 No. 2
As first announced on CBET 2176, S. Nakano (Sumoto, Japan)
reported the discovery by H. Nishimura (Miyawaki, Kakegawa,
Shizuoka-ken, Japan) of a possible nova on frames taken on Feb.
18.845 UT using a Minolta 120-mm f/3.5 lens and a Canon EOS 5D
Digital camera mounted on a Takahashi EM100 equatorial telescope;
Nakano measured mag 9.4 for the variable from Nishimura's JPEG
image (limiting mag 12.7), along with the following precise
position (uncertainty +/- 4"): R.A. = 17h26m32s.19, Decl. =
-28o49'36".3 (equinox 2000.0). Nishimura notes that nothing is
visible at this position on his frames taken during 2009 Feb.-2010
Feb. 13.84 (limiting mag 11). Additional CCD magnitudes
(unfiltered unless noted otherwise) and position end figures for
the nova: Feb. 19.48, R_c = 9.02, 32s.11, 38".5 (S. Kiyota,
Tsukuba, Japan, 0.30-m reflector, remotely from near Mayhill, NM,
U.S.A.); 19.778, 9.0, 32s.08, 38".5 (K. Itagaki, Takanezawa station,
Tochigi-ken, Japan, 0.30-m reflector); 19.825, 8.9, 32s.11, 39".0
(K. Kadota, Ageo, Japan, 0.25-m reflector); 20.5, 9.4:, 32s.15,
41".8 (E. Guido and G. Sostero, 0.25-m reflector at the GRAS
Observatory near Mayhill, NM, U.S.A.). Kiyota adds that nothing is
visible at this position on several Digitized Sky Survey plates.
K. Imamura and K. Tanabe, Okayama University of Science, report
(via H. Yamaoka, Kyushu University) that a low-resolution spectrum
of the presumed nova, obtained on Feb. 19.850 UT with a 0.28-m
telescope, shows a clear H_alpha feature with a P-Cyg profile,
which suggests that the object is a genuine classical nova; an
absorption minimum of the H_alpha feature is about 1000 km/s,
blueshifted from the emission peak. M. Fujii, Kurashiki, Okayama,
Japan, writes (also via Yamaoka) that a low-resolution spectrum of
this object, obtained on Feb. 19.86 UT with his 0.28-m telescope,
shows -- in addition to the Balmer lines with P-Cyg profile -- a Fe
II (37, 42, 49) emission feature, which suggests that the variable
is a "Fe II"-class nova. Fujii measured that the blueshift of the
H_alpha absorption minimum from the emission peak is about 700 km/s,
and the equivalent width of Na I D lines is about 0.4 nm.
Additional details concerning this nova can be found on CBETs 2176,
2179, and 2185.
E. Kazarovets and N. N. Samus report that the formal GCVS
designation V2674 Oph has been assigned to this nova.
COMET 233P/LA SAGRA
Following an identification by G. V. Williams of comet P/2009
WJ_50 (cf. IAUC 9117) with 2005 JR_71 (cf. MPO 169487; MPEC
2010-D2; MPC 68903), it has been given the permanent number 233P
(cf. MPC 68628).
(C) Copyright 2010 CBAT
2010 March 1 (9119) Daniel W. E. Green
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