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Alert Notice 381: Second possible nova in Ophiuchus - Nova Oph 2008 No. 2

June 2, 2008

Event: Second (Possible) Nova in Ophiuchus in 2008 - N OPH 2008 NO. 2

Discovered By: K. Nishiyama, Kurume, Fukuoka-ken, Japan, and F. Kabashima, Miyaki-cho, Saga-ken, Japan

Discovery Date: May 31.608 and 31.609 UT

Discovery Magnitude: unfiltered CCD magnitude 11.3 (two 30-s CCD frames using a 105-mm f/5.6 camera lens)

Position:  R.A. = 17:33:29.67  Decl. = -27:01:16.4 (equinox 2000.0) measured by Nishiyama and Kabashima on their confirming image taken May 31.628 UT.

Charts: Finder charts for this object may be plotted by entering the coordinates above into VSP: http://www.aavso.org/vsp

A sequence is in preparation. (The coordinates may be copy-and-pasted into VSX as they appear here; there is no need to remove the : between elements of each coordinate.)

Submit data: Please submit data to the AAVSO using the name "N OPH 2008 NO. 2" or "VSX J173329.6-270116". This object has been assigned the AAVSO Unique ID "000-BFT-372".

Notes:

Multiple confirmations were reported after the object was posted on the CBAT unconfirmed objects webpage.  Observations of the field prior to the current outburst indicated no object visible at those coordinates, the faintest of which (UK Schmidt Telescope red plates, checked by E. Guido and G. Sostero, Remanzacco, Italy) showed no object down to 20th magnitude on 1991 August 11.

The discoverers add that nothing is visible at this position on Digitized Sky Survey red images.  NSV 22564 is located some 2' away. 

Recent photometry show the object on June 2.23 UT at B = 13.9, V = 12.8, R= 11.4, Guido and Sostero (remotely with a 25-cm reflector near Mayhill, New Mexico); and on June 2.39 at V = 12.8, C. Jacques and E. Pimentel, Belo Horizonte, Brazil (remotely with a 25-cm reflector near Mayhill).

Spectra for this object have not been published so its exact nature is not yet known.

All discovery information in this Alert Notice is from IAU Circular 8950, Daniel W.E. Green, editor.  For full details on the discovery and subsequent observations, please see the circular.

Congratulations to K. Nishiyama and F. Kabashima on their latest discovery!

Good observing,

Elizabeth O. Waagen, AAVSO

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