April 21, 2012: The discovery of a possible nova in Sagittarius [V5589 Sgr] was posted on the IAU CBAT Transient Object Confirmation Page (TOCP, http://www.cbat.eps.harvard.edu/unconf/tocp.html). It was discovered by Stanislav Korotkiy (Ka-Dar Observatory, Barybino, Russia) and Kirill Sokolovsky (Astro Space Center, Lebedev Physics Institute/Sternberg Astronomical Institute, Moscow State University) on 2012 Apr 21.01123 UT at unfiltered magnitude 9.6 +/0.3 on three unfiltered CCD images (limiting magnitude ~14.0). Nothing was visible down to 14.0 on images obtained on 2012 April 17.99 UT. No correlated object was found using MPChecker, AAVSO VSX, and SIMBAD.
Coordinates: 17:45:28.03 -23:05:22.8 +/-1" (2000.0)
They report the USNO-B1.0 catalog lists USNO-B1.0 0669-0621295 (magnitudes R1=16.21, B2=18.61, R2=18.65, I=16.62) 0.6" away. Discovery images URL: http://www.astroalert.su/files/pnv_j17452791-2305213.jpg.
John Seach (Chatsworth Island, NSW, Australia) confirms a 8.8-magnitude object at the discovery position on a DSLR image taken 2012 April 21.654 UT.
Observations and spectroscopy are requested to determine the nature of this object.
Charts may be generated for this object using the AAVSO Variable Star Plotter (VSP): http://www.aavso.org/vsp.
Until an official name is assigned, please report observations to the AAVSO International Database as PNV J17452791-2305213.
This AAVSO Special Notice was compiled by Elizabeth O. Waagen.
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