Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 8937: N Sgr 2008

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

Read IAUC 8936  SEARCH Read IAUC 8938

View IAUC 8937 in .dvi, .ps or .PDF format.
IAUC number

                                                  Circular No. 8937
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://www.cfa.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 of a possible
nova (mag 8.4) on two 30-s unfiltered CCD survey frames taken on
Apr. 18.784 UT by K. Nishiyama (Kurume, Fukuoka-ken, Japan) and F.
Kabashima (Miyaki-cho, Saga-ken, Japan) using a 105-mm f/5.6 camera
lens (limiting mag about 12.6).  An unfiltered CCD image taken with
a 0.40-m f/9.8 reflector on Apr. 18.809 yields mag 8.4 and the
following precise position for the new object:  R.A. = 18h05m58s.88,
Decl. = -27o13'56".0 (equinox 2000.0).  Nothing is visible at this
position on the Digitized Sky Survey (DSS).  A nearby USNO-B1.0
star has I mag 18.3 and position end figures 58s.38, 55".9.
Following posting on the Central Bureau's unconfirmed-objects
webpage, S. Dvorak, Clermont, FL, U.S.A., writes that his CCD
exposures taken with a 0.25-m Meade LX200 reflector (+ ST-9XE
camera) on Apr. 19.36 yield position end figures 58s.85, 57".0 for
the new variable.  Dvorak adds that nothing appears at this
position on a DSS red image from 1991, noting that nearby stars are
obviously visible therein that have USNO-B1.0 red magnitudes around
20; he also remarks that a couple of stars at red mag about 15
nicely bracket the apparent nova.  Additionally, E. Guido and G.
Sostero (Remanzacco, Italy) report that their confirming CCD images
taken remotely with a 0.25-m f/3.4 reflector near Mayhill, NM, on
Apr. 19.39 show the new object at position figures 58s.90, 56".3;
comparison with a U.K. Schmidt red plate obtained on 1996 Sept. 8
shows nothing at this position (limiting magnitude near 20).  H.
Yamaoka, Kyushu University, writes that K. Haseda (Toyohashi,
Aichi, Japan) adds that M. Fujii (Kurashiki, Okayama, Japan) took a
low-resolution spectrum with his 0.28-m reflector on Apr. 19.82,
revealing Balmer lines and several broad absorption lines; the
H_alpha line shows a prominent P-Cyg profile, which suggests that
it is a genuine classical nova around or soon after maximum.  The
following additional CCD magnitudes have been reported for the nova
(unfiltered unless otherwise noted):  Apr. 11.593, [11 (P.
Camilleri, Hurstville, Sydney, N.S.W.); 13.3, [11.0: (W. Liller,
Vina del Mar, Chile; Tech Pan films with an orange filter, 85-mm
camera lens); 13.765, [12.2 (Nishiyama and Kabashima); 14.805,
[12.8 (Nishiyama and Kabashima); 15.743, [11.5 (K. Haseda,
Toyohashi, Aichi, Japan, Canon EOS-5D digital camera + 120-mm-f.l.
lens; communicated by Yamaoka); 16.22, [11.0: (Liller); 19.36, V =
8.94, B = 9.98 (Dvorak; revision to CBET 1342); 19.39, B = 9.84, V
= 8.90, R = 8.30 (Guido and Sostero; uncertainty +/- 0.05 mag);
19.725, 7.9 (Nishiyama and Kabashima).  Visual magnitude estimate
by A. Amorim, Florianopolis, Brazil:  Apr. 23.099, 6.5.

                      (C) Copyright 2008 CBAT
2008 April 23                  (8937)            Daniel W. E. Green

Read IAUC 8936  SEARCH Read IAUC 8938

View IAUC 8937 in .dvi, .ps or .PDF format.

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!