Discovery of a Probable Nova in M31

ATel #7766; K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic), J. Vrastil (Astronomical Institute, Charles U., Prague, Czech Republic)
on 6 Jul 2015; 11:00 UT
Credential Certification: Martin Henze (henze@ice.cat)

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We report the discovery of a probable nova in M31 on a co-added 900-s R-band CCD frame taken on 2015 Jul. 6.026 UT with the 0.65-m telescope at Ondrejov.

The object designated PNV J00424534+4119303 is located at R.A. = 0h42m45s.34, Decl. = +41o19'30".3 (equinox 2000.0), which is 11.4" east and 201.8" north of the center of M31 (see link to discovery image below).

The following R-band magnitudes were obtained using the 0.65-m telescope at Ondrejov:

2015 Jul. 4.051 UT, [19.8; 5.030, 19.6 ± 0.4 (prediscovery); 6.026, 18.2 ± 0.15.

We thank K. Honkova for getting M31 images on Jul. 4.051 and 5.030 UT.

Discovery image