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IAUC 8824: V2615 Oph = N Oph 2007

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                                                  Circular No. 8824
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     S. Nakano, Sumoto, Japan, reports the discovery by Hideo
Nishimura (Miyawaki, Kakegawa, Shizuoka-ken) of a possible nova
(mag 10.2) on two Kodak T-Max 400 films (limiting mag 12) taken on
Mar. 19.812 UT using a Pentax 6x7 camera (+ 200-mm f/4 lens), the
new object's position given as R.A. = 17h42m49s, Decl. = -23o40'07"
(equinox 2000.0).  Nothing was visible at this location on a film
taken by Nishimura on Mar. 17.82 and earlier survey films since
2005 (limiting mag 11.5-12).  Nakano adds that K. Kadota (Ageo,
Japan) confirms the new star at mag 9.8 on an unfiltered CCD
exposure taken on Mar. 20.756 with a 0.25-m f/5 reflector, at
position end figures 44s.00, 35".1; Kadota adds that there is no
USNO-A2.0 star within 0'.1 of this position (the closest star
having position end figures 43s.41, 34".9 and blue mag 18.5, red
mag 16.8).  Also, K. Itagaki has confirmed the new star using
0.30-m f/7.8 reflector at his Takanezawa station, his CCD image on
Mar. 20.806 yielding mag 9.7 and position end figures 43s.99, 35".0.
H. Yamaoka, Kyushu University, reports the apparently independent
discovery of this apparent nova by Yuji Nakamura (Kameyama, Mie,
Japan) at mag 10.0 on unfiltered digital-camera images taken on Mar.
20.812 UT.  The variable's position end figures were given by
Nakamura as 44s.5, 16" (uncertainty +/- 20"); nothing was detected
at this position on an image taken by Nakamura on Mar. 17.825
(limiting mag about 13.0).  Yamaoka notes that a star of mag 12-13
is located 1' northeast of the new object.  Nakano further writes
that, following announcement of this nova on CBET 900, he received
word of an apparently independent discovery at mag 10.2 by A. Tago
(Tsuyama, Okayama-ken, Canon 20Da digital camera + 70-mm f/3.2 lens)
on three frames taken around Mar. 20.8; Tago's images from Mar.
18.82 show nothing at the nova's position to mag 11.3.
     Following posting on the Central Bureau's unconfirmed-objects
webpage, H. Naito and S. Narusawa, Nishi-Harima Astronomical
Observatory, report that a low-resolution spectrogram (range
410-670 nm; resolution 1500 at H_alpha) of this possible nova,
obtained on Mar. 20.84 UT with the 2.0-m NAYUTA telescope (+ MALLS),
shows Balmer-lines having P-Cyg features and Fe II lines
(multiplets 42, 49, 74), suggesting that the variable is a "Fe II"-
type nova.  The FWHMs of the H_alpha, H_beta, and H_gamma emissions
are 920, 810, and 790 km/s, and the displacement of the P-Cyg
absorptions from the Balmer emission peaks is 940, 820, and 830
km/s, respectively.
     N. N. Samus, Institute of Astronomy, Russian Academy of
Sciences, informs us that this nova has been given the designation
V2615 Oph.

                      (C) Copyright 2007 CBAT
2007 March 21                  (8824)            Daniel W. E. Green

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