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Discovery of a Probable Nova in M81

ATel #9806; K. Hornoch (Ondrejov), H. Kucakova (Charles University), M. Henze (CSIC-IEEC), S. C. Williams (Lancaster), M. J. Darnley (LJMU), A. Kaur, D. H. Hartmann (Clemson), G. Sala, J. Jose, J. Figueira, P. Sin (UPC-IEEC), M. Hernanz (CSIC-IEEC), A. W. Shafter (SDSU), H. Meusinger (TLS)
on 29 Nov 2016; 22:13 UT
Credential Certification: Allen W. Shafter (ashafter@mail.sdsu.edu)

Subjects: Optical, Nova, Transient

The M81 nova monitoring collaboration reports the discovery of a probable nova in M81 on a co-added 4860-s unfiltered CCD frame taken on 2016 Nov. 28.132 UT with the 0.65-m telescope at Ondrejov. The new object is also visible on a prediscovery stack of 20 × 200s R filter images taken with the Telescopi Joan Oro (TJO) on Nov. 27.977 UT.

The new object designated PNV J09562755+6859291 is located at R.A. = 9h56m27s.55, Decl. = +68o59'29".1 (equinox 2000.0), which is 291.9" east and 266.0" south of the center of M81 (see link to discovery image below).

Here we list the observing dates and corresponding photometry:
 
  Date [UT]    |  Mag  | Err  | Filter | Telescope  
2016-11-15.016 | <21.9 |      | C      | OND 
2016-11-17.987 | <21.5 |      | R      | TJO 
2016-11-27.977 |  20.8 | 0.4  | R      | TJO 
2016-11-28.132 |  20.6 | 0.2  | C      | OND 
2016-11-28.970 |  21.0 | 0.4  | R      | TJO 
2016-11-29.105 |  20.5 | 0.2  | C      | OND 
 
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 photometry was calibrated against R-band comparison stars from Perelmuter & Racine (1995). The 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 micron square pixels. The TJO photometry is based on the SDSS DR7 photometry catalogue.

Discovery image