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Discovery of a Probable Nova in M31

ATel #9976; K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic), H. Kucakova (Astronomical Institute, Charles U., Prague, Czech Republic)
on 19 Jan 2017; 19:38 UT
Credential Certification: Martin Henze (henze@ice.cat)

Subjects: Optical, Nova, Transient

Referred to by ATel #: 10003

We report the discovery of a probable nova in M31 on a co-added 1530-s R-band CCD frame taken on 2017 Jan. 19.705 UT with the 0.65-m telescope at Ondrejov. The new object is barely visible also on a prediscovery frame taken on Jan. 18.701 UT with the same instrumentation.

The object designated PNV J00424147+4116595 is located at R.A. = 0h42m41s.47, Decl. = +41o16'59".5 (equinox 2000.0), which is 32.2" west and 51.0" 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:

2017 Jan. 15.872, [19.2; 18.701, 18.3 ± 0.25; 19.705, 17.5 ± 0.15.

Discovery image