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Discovery of a new M81 nova candidate

ATel #9979; G. Sala, P. Sin (UPC-IEEC), M. Henze (CSIC-IEEC), K. Hornoch (Ondrejov), J. Vrastil, H. Kucakova (Charles University), S. C. Williams (Lancaster), M. J. Darnley (LJMU), A. Kaur, D. H. Hartmann (Clemson), J. Jose (UPC-IEEC), M. Hernanz (CSIC-IEEC), A. W. Shafter (SDSU), H. Meusinger (TLS)
on 20 Jan 2017; 16:38 UT
Credential Certification: Gloria Sala (gloria.sala@upc.edu)

Subjects: Optical, Nova

The M81 nova monitoring collaboration reports the discovery of a probable nova in M81 on co-added images obtained at the 0.80-m telescope Joan Oro (TJO) and the 0.65-m telescope at Ondrejov (OND). The candidate was first detected with the TJO on 2017-01-13T21:05:19.08 with an R-magnitude 19.4 +/-0.3.

We measure the position of the candidate M81N 2017-01a to be RA: 9:55:39.8 and DEC:+69:06:28.1 (J2000, position 1σ error 0.2").

Here we list the observing dates and corresponding photometry:

 
  Date [UT]    |  Mag  | Err  | Filter | Telescope 
 2017-01-11.103 | <21.7 |      | C      | OND 
 2017-01-13.879 |  19.4 | 0.3  | R      | TJO 
 2017-01-18.998 |  21.3 | 0.4  | C      | OND 
 2017-01-20.049 |  21.3 | 0.3  | C      | OND 

The Telescopi Joan Oro (TJO) is a 80-cm Ritchey-Chretien F/9.6 telescope at the Observatori Astronomic del Montsec, owned by the Catalan Government and operated by the Institut d'Estudis Espacials de Catalunya, Spain. It uses a Finger Lakes PL4240-1-BI CCD Camera with a Class 1 Basic Broadband coated 2k x 2k chip with 13.5 microns square pixels. The OND 0.65-m is a reflecting telescope at the Ondrejov observatory operated jointly by the Astronomical Institute of ASCR and the Astronomical Institute of the Charles University of Prague, Czech Republic. It uses a Moravian Instruments G2-3200 CCD camera (with a Kodak KAF-3200ME sensor and standard BVRI photometric filters) mounted at the prime focus. The unfiltered OND photometry was calibrated against R-band comparison stars from Perelmuter & Racine (1995). The TJO photometry is based on the SDSS DR7 photometry catalogue.