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AAVSO Special Notice #190: Probable Nova in Sagittarius AAVSO HOME > publications > special notice

AAVSO Special Notice #190

Probable Nova in Sagittarius
January 24, 2010

Further to CBET 2140 (D.W.E. Green, editor), a probably nova has been
discovered in Sagittarius by J. Seach (Chatsworth Is., NSW, Australia).
The object was discovered by Seach on 2010 January 20.22 UT (JD
2455216.72) at a magnitude of approximately 8.5 using a DSLR with 50-mm
f/1.4 lens and orange filter, at coordinates RA: 18:07:26 , Dec:
-29:01:00. Nothing was visible at this location in a prior image taken
2009 November 15.89 to a limit of mag 11.5.  The object has since been
confirmed by several observers: W. Vollmann (Vienna, Austria), 2010 Jan
22.287, CV=9.3; S. Kiyota (Tsukuba, Japan), 2010 January 22.862, V=8.98,
(V-Rc)=+0.60, (V-Ic)=1.20; K. Nishiyama (Kurume, Fukuoka-ken, Japan) and
F. Kabashima (Miyaki-cho, Saga-ken, Japan), 2010 January 23.892, CV=8.5. 
Nishiyama and Kabashima also provide higher precision coordinates:

        RA: 18:07:26.95 , Dec: -29:00:43.6 (J2000)

obtained with a 0.4-m Meade 200R f/9.8 reflector and SBIG STL1001E CCD
(CBET 2142, D.W.E. Green, editor).  CBET 2142 also reports that
spectroscopy by H. Maehara, Kwasan Observatory (Kyoto U.) obtained on
2010 Jan 23.887 shows broad hydrogen H(alpha), along with H(beta) and
iron FeII lines in emission, suggesting a nova.

Observations of this probable nova are encouraged.  However, note that
this is an extremely crowded field, and the object will be difficult
to photometer once it fades.

Charts for Nova Sgr 2010 may be plotted using VSP:

Please report observations of this object to the AAVSO using the name
"NOVA SGR 2010".  An Alert Notice will be issued once the object is
assigned a formal variable star name.

This AAVSO Special Notice was prepared by M. Templeton.


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