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Discovery of an Apparent Nova in M31

ATel #10476; K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic), H. Kucakova (Astronomical Institute, Charles U., Prague, Czech Republic)
on 8 Jun 2017; 10:02 UT
Credential Certification: Martin Henze (henze@ice.cat)

Subjects: Optical, Nova, Transient

Referred to by ATel #: 10522

We report the discovery of an apparent nova in M31 on a co-added 1530-s R-band CCD frame taken on 2017 Jun. 7.994 UT with the 0.65-m telescope at Ondrejov. The new object is visible also on a prediscovery frame taken on 2017 Jun. 5.066 UT with the same instrumentation.

The object designated PNV J00423878+4115498 is located at R.A. = 0h42m38s.78, Decl. = +41o15'49".8 (equinox 2000.0), which is 62.5" west and 18.7" south 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:

2017 Jun. 3.057 UT, [19.8; 4.054, [18.6; 5.066, 18.1 ± 0.15; 7.994, 16.5 ± 0.1; 8.044, 16.5 ± 0.1.

We thank J. Vrastil for getting images on Jun. 3.057 UT.

Discovery image