Alert Notice 380: Nova in Ophiuchus

May 27, 2008

Event: Nova in Ophiuchus

Discovered By: independently by several Japanese observers using unfiltered CCDs:
        -- K. Nishiyama, Kurume, Fukuoka-ken, and F. Kabashima, Miyaki-cho, Saga-ken
        -- H. Nishimura, Kakegawa, Shizuoka-ken
        -- K. Haseda, Toyohashi, Aichi; via H. Yamaoka, Kyushu University

Discovery Date: 2008 May 25 (JD 2454612)

Discovery Magnitude: approximately 10.2 (visual estimate)

Position: R.A. = 17h 39m 50.93s ; Decl. = -23o 50' 00.9" (J2000)
        by K. Nishiyama and F. Kabashima

Charts: Finder charts for this object may be plotted by entering the coordinates above into VSP:

There are a few existing comparison stars to the southeast of the variable on a C-scale chart; more comparison stars will be added as soon as a sequence has become available.


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.

Several observations published in IAU Circular 8947 suggest the nova has remained relatively constant at its discovery magnitude, remaining around m(vis) ~ 10.2.

Spectra for this object have not been published so the nova type is not yet known.

All discovery information in this Alert Notice is from IAU Circular 8947, Daniel W.E. Green, editor.  For full details on the discovery and subsequent observations, please see the circular.

Please submit data to the AAVSO using the name "N OPH 2008", or the alias "Nova Oph 2008", or "VSX J173950.9-235000".  This object has been assigned the AAVSO Unique ID of "000-BFT-356".

Congratulations to the discoverers!

Good observing,

Matthew Templeton & Elizabeth Waagen, AAVSO



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