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OGLE-2017-NOVA-01 - A New Galactic Nova in Sagittarius

ATel #10103; J. Skowron, P. Mroz and A. Udalski (Warsaw University Observatory) on behalf of the OGLE-IV survey team
on 20 Feb 2017; 15:13 UT
Distributed as an Instant Email Notice Novae
Credential Certification: Andrzej Udalski (udalski@astrouw.edu.pl)

Subjects: Optical, Nova, Transient

We report the discovery of a new Galactic Nova candidate in the fields of the OGLE sky survey toward the Galactic Bulge at RA = 18:10:28.29 Dec = -27:29:59.3 (J2000). The transient was discovered by the OGLE Early Warning System (OGLE-2017-BLG-0063) on Feb 13, 2017 with the first detection at I~12.2 mag on 2017 Feb 8.35 UT. This was the first exposure of this field in the 2017 season, hence, the maximum of the nova outburst likely happened around Jan/Feb 2017. The brightness of the object currently declines with the rate of ~0.05 mag/day.

Position of the nova candidate indicates that its progenitor is blended with a ~19.5 mag neighboring star. Past 15 years of continuous OGLE monitoring provides the 2500-epoch light curve of the blend with no apparent variability nor periodic signal. The OGLE data indicate that the amplitude of the outburst was well over 7 mag clearly implying the nova origin of the transient.

Most recent preliminary photometric measurements are:

 
#    HJD        MAG  DMAG 
2457672.49095  19.398  0.1918 
2457673.51090  19.392  0.1744 
2457675.51912  19.181  0.1332 
2457792.85211  12.176  0.0131 
2457793.85932  12.639  0.0069 
2457794.86601  12.583  0.0075 
2457797.85123  12.379  0.0099 
2457799.84524  12.640  0.0069 
2457801.83467  12.580  0.0075 
2457803.81405  12.618  0.0071 
2457803.87192  12.644  0.0069 

Preliminary online photometry is available on the OGLE EWS page of OGLE-2017-BLG-0063.

Finding charts of OGLE-2017-NOVA-01