Sziasztok!
A CBET 2128. száma szerint Hideo Nisimura tegnapelőtt felfedezett egy
fényes nóvát a Kígyótartóban az R.A. = 17h39m41s, Decl. = -21d39´47"
(equinox 2000.) pozícióban. A legutóbbi észlelések szerint majdnem 8
magnitudó a fényessége.
Attól félek, hazánkból még pár hétig nem fog látszani, de talán nem
maradunk le róla túlságosan...
Ha jól tudom, ez az idei év első galaktikus nóvája.
* * *
CBET No. 2128
NOVA OPHIUCHI 2010
S. Nakano, Sumoto, Japan, reports the discovery by Hideo Nishimura
(Miyawaki, Kakegawa, Shizuoka-ken, Japan) of a possible nova (mag 8.4) on
two 13-s frames (limiting magnitude 11.0, measured by Nakano) taken on Jan.
15.857 UT with a Canon EOS 5D Digital Camera (+ Minolta 120-mm f/3.5 lens),
providing the position as R.A. = 17h39m41s, Decl. = -21d39´47" (equinox
2000.0; measured by Nishimura). Nothing appears at this position on a frame
from Jan. 13.86 (limiting mag about 9.5, assessed by Nishimura) or on frames
taken monthly during 2009 Jan. 29-Nov. 3 (limiting mag 11.0). However,
Nishimura did identify a faint image on a frame taken on Jan. 14.865,
from which Nakano derives mag 10.1 (and limiting mag 10.6) and position end
figures 41s.3, 54" for the new object; Nakano also measures mag 8.8 and
position end figures 40s.90, 50".5 from Nishimura´s discovery image on
Jan. 15. Additional position end figures and magnitudes forwarded by Nakano
for the presumed nova from unfiltered CCD frames taken by other observers:
Jan. 16.856, 40s.94, 47".9, mag 8.4 (K. Itagaki, Takanezawa station,
Tochigi-ken, Japan, 0.30-m f/7.8 reflector); Jan. 16.860, 40s.97, 47".4, mag
8.2 (K. Kadota, Ageo, Saitama-ken, Japan, 0.25-m f/5 reflector). Kadota
adds that nothing is visible at this position on a red Digitized Sky Survey
image from 1997 (limiting mag estimated to be 20 by Nakano). Itagaki has
posted his image at website URL
http://www.k-itagaki.jp/images/pn-sgr.jpg.
NOTE: These ´Central Bureau Electronic Telegrams´ are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2010 CBAT
2010 January 16 (CBET 2128) Daniel W. E. Green
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