Discovery of a Probable Nova in M81
ATel #11098; K. Hornoch, H. Kucakova (Ondrejov), S. C. Williams (Lancaster), M. Henze (SDSU), G. Sala, J. Jose, J. Figueira, P. Sin (UPC-IEEC), H. Meusinger (TLS), M. J. Darnley (LJMU), A. Kaur, D. H. Hartmann (Clemson), A. W. Shafter (SDSU)
on 27 Dec 2017; 19:36 UT
Credential Certification: Steven Williams (email@example.com)
Subjects: Optical, Nova, Transient
The M81 nova monitoring collaboration reports the discovery of a probable nova in M81
on a co-added 2610-s unfiltered CCD frame taken on 2017 Dec. 26.016 UT with the 0.65-m
telescope at Ondrejov (OND).
The object designated PNV J09553619+6901599 is located at R.A. = 9h55m36.19,
Decl. = +69o01'59".9 (equinox 2000.0), which is 16.2" east and 115.2" 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
2017-12-13.205 | <21.8 | | C | OND
2017-12-26.016 | 20.9 | 0.3 | C | OND
2017-12-27.091 | 20.6 | 0.2 | Hα | LT
2017-12-27.199 | 20.5 | 0.25 | 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 OND photometry was calibrated against R-band comparison stars from
Perelmuter & Racine (1995)
The LT (Steele et al. 2004)
is a fully robotic 2-m telescope operated on the island of La Palma by Liverpool John Moores
University in the Spanish Observatorio del Roque de los Muchachos of the Instituto
de Astrofisica de Canarias with financial support from the UK Science and Technology
Facilities Council. Our observations use the IO:O optical CCD camera of the LT.
The LT photometry is based on the SDSS DR7 photometry catalogue.
The Hα magnitude is defined on the AB system where mHα = 0 for fλ = 2.53 × 10-9 erg/cm2/s/Å.
Through a 90 Å wide filter, this corresponds to a zero point flux of ~2.3 × 10-7 erg/cm2/s.