Discovery of Two Probable Novae in M31

ATel #10484; K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic), H. Kucakova (Astronomical Institute, Charles U., Prague, Czech Republic)
on 12 Jun 2017; 10:19 UT
Credential Certification: Steven Williams (scw@astro.ljmu.ac.uk)

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We report the discovery of two probable novae in M31 on a co-added 1440-s R-band CCD frame taken on 2017 Jun. 10.991 UT with the 0.65-m telescope at Ondrejov.

Designations, positions, and offsets of the new objects from the M31 center are summarized in the following table:

 
  TOCP designation    CBAT designation  R.A. (J2000)  Dec. (J2000)  Offset R.A.  Offset Dec. 
 
PNV J00425119+4116279  M31N 2017-06b?   00 42 51.19   +41 16 27.9     77.4" E      19.4" N 
PNV J00423291+4112236  M31N 2017-06c?   00 42 32.91   +41 12 23.6    128.7" W     224.9" S 

The following R-band magnitudes were obtained for the PNV J00425119+4116279 using the 0.65-m telescope at Ondrejov:

2017 Jun. 5.066 UT, [19.5; 7.994, 19.1 ± 0.4 (prediscovery); 8.995, 18.2 ± 0.15 (prediscovery); 10.991, 17.6 ± 0.15; 11.007, 17.4 ± 0.15.

The following R-band magnitudes were obtained for the PNV J00423291+4112236:

2017 Jun. 5.066 UT, [20.1; 7.994, [19.4; 8.995, 19.2 ± 0.25 (prediscovery); 10.991, 18.2 ± 0.15; 11.018, 18.0 ± 0.15.

Discovery image