Discovery of a Probable Nova in M81
ATel #11248; K. Hornoch, H. Kucakova (Ondrejov), S. C. Williams (Lancaster), M. Henze (SDSU), G. Sala, J. Jose (UPC-IEEC), H. Meusinger (TLS), M. J. Darnley (LJMU), A. Kaur, D. H. Hartmann (Clemson), A. W. Shafter (SDSU)
on 31 Jan 2018; 15:53 UT
Credential Certification: Steven Williams (scw@astro.ljmu.ac.uk)
Subjects: Optical, Nova, Transient
The M81 nova monitoring collaboration reports the discovery of a probable nova in M81
on a co-added 3150-s unfiltered CCD frame taken on 2018 Jan. 30.776 UT with the 0.65-m
telescope at Ondrejov (OND). The nova candidate is also visible on prediscovery R-band images
taken on 2018 Jan 29.055 UT and 29.875 UT with the 0.80-m telescope Joan Oro (TJO).
The object designated PNV J09555926+6903517 is located at R.A. = 9h55m59.26,
Decl. = +69o03'51".7 (equinox 2000.0), which is 139.8" east and 3.4" 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>
2018-01-26.817 | <22.1 | | C | OND
2018-01-29.055 | 21.2 | 0.4 | R | TJO
2018-01-29.875 | 20.5 | 0.4 | R | TJO
2018-01-30.776 | 20.3 | 0.15 | C | OND
2018-01-30.996 | 20.3 | 0.15 | 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 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 TJO photometry is based on the SDSS DR7 photometry catalogue.
The unfiltered OND photometry was calibrated against R-band comparison stars from
Perelmuter & Racine (1995).
Discovery image