Central Bureau for Astronomical Telegrams
IAUC 8937: N Sgr 2008
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Circular No. 8937
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)
NOVA SAGITTARII 2008
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
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