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Discovery of a Very Bright Nova in M81

ATel #4794; K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic), J. Vrastil (Astronomical Institute, Charles U., Prague, Czech Republic)
on 7 Feb 2013; 07:39 UT
Credential Certification: Allen W. Shafter (aws@nova.sdsu.edu)

Subjects: Optical, Nova, Transient

Referred to by ATel #: 4813, 4844, 4968, 5885

We report the discovery of a very bright nova in M81 on a co-added 810-s unfiltered CCD frame taken on 2013 Feb. 6.990 UT with the 0.65-m telescope at Ondrejov.

The new object designated PNV J09555123+6901482 is located at R.A. = 9h55m51s.23, Decl. = +69o01'48".2 (equinox 2000.0), which is 96.9" east and 126.9" south of the center of M81 (see link to discovery image below).

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

2012 Dec. 9.179 UT, [22.5 (unfiltered, R-band magnitudes used from comparison stars); 2013 Feb. 6.990, 18.2 +/- 0.1 (unfiltered, R-band magnitudes used from comparison stars); 7.002, R = 18.0 +/- 0.1; 7.016, V = 18.4 +/- 0.1; 7.032, B = 18.8 +/- 0.1.

The object has absolute mag MR = -9.8 (using distance modulus μ = 27.8 for M81), which is comparable with maximum magnitude MR = -10.2 of M81N 2007-04b, the most luminous observed nova in M81 (Hornoch et al. 2008, A&A 492, 301). Spectroscopic follow-up is strongly encouraged.

Discovery Image