IAU Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

M81 (Apparent) Novae Page

This webpage is based on the M31 webpage also run by the CBAT. This webpage was begun in 2009 to address the reports of apparent M81 novae sent to the CBAT. To warrant inclusion here, we go by the same rules that govern assignment of supernova and nova designations -- namely, that multiple nights of observations must be reported (excepting where multiple observatories report confirming observations on a single night, or spectroscopy is immediately available). This page is patterned after the CBAT's Unconfirmed Supernovae webpage.

An asterisk (*) after the designation in the table below indicates that the object has been shown to not be a nova (see the associated notes).


The observations of apparent novae in M81 are listed below in plain ASCII text (with NO tabs!) in a 98-column format. The designation scheme is M81N YYYY-MMa, where YYYY is the year and MM is the 2-digit month of discovery, and 'a' is a lower-case letter (a, b, c, etc.) representing the order of discovery within that month; note that multiple lines for the same object are tabulated when there is more than one independent discovery of a particular nova (i.e., one line per discovery report). Note the following template to guide you in producing a similar list to send for inclusion.

     
         1         2         3         4         5         6         7         8         9          
123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456    
M81N       DATE (UT)         R.A. (2000.0) Decl.     Mag.    OFFSET       REPORTER
YYYY-MMa   YYYY MM DD.DDD  hh mm ss.ss +oo '' ""."  MM.MLx  rrrD rrrD     Person sending text       
          

Above, the date (given as year, month, date in Universal Time) should be given to 0.01 or 0.001 day, with leading zeroes if appropriate, in columns 12-25. The right ascension (columns 28-38) and declination (columns 40-50) should be given to full precision (0s.01 in R.A. and 0".1 in Decl.), with leading zeroes if appropriate. The magnitude should be given to tenths in columns 53-56, with column 57 for the bandpass (and column 58 for any additional bandpass character); use usual upper- and lower-letter band letters, "H" for H-alpha narrowband magnitudes, and use "U" for unfiltered CCD. The offset (columns 60-64 for right ascension and columns 66-70 for declination) of the new object from the center of M81 should be given in arc seconds for both R.A. and Decl., with the values given to 0".1 and the directional letters (E = east = 90 degrees clockwise from north toward south, and W = west for R.A. offsets; N = north and S = south for Decl. offsets) specified. The person(s) who actually send the e-mail with the discovery should be placed (first initial, full last name) in columns 75-93. Columns 95-98 contains the number for the note that will contain additional information (including the name of the survey, any other contributing astronomers, and important succinct details regarding reference images and their dates and limiting magnitudes, etc.); the appropriate sequential designation number and letter will be added by the webmaster.

For reference, the nucleus or core of M81 is located at R.A. = 9h55m33s.2, Decl. = +69o03'55" (equinox 2000.0; according to measurements by M. M. Kasliwal et al. and by K. Hornoch for M81N 2008-12a and M81N 2008-12b and their offsets for the galaxy center).


     
         1         2         3         4         5         6         7         8         9          
123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456    

M81N       DATE (UT)         R.A. (2000.0) Decl.     Mag.    OFFSET       REPORTER
2003-02a   2003 02 09.4    09 55 48.59 +69 03 04.3  17.8U    83E   51S    W. Li

2007-04a   2007 04 08.874  09 55 28.58 +69 04 21.6  19.2U    25W   26N    K. Hornoch
2007-04b   2007 04 11.865  09 55 31.30 +69 05 28.9  19.9U    10W   94N    K. Hornoch

2008-03a   2008 03 02.775  09 55 58.31 +69 06 07.9  20.3U   135E  133N    K. Hornoch

2008-09a   2008 09 25.49   09 55 59.35 +69 05 57.1  19.5g   141E  122N    M. M. Kasliwal

2008-12a   2008 12 03.303  09 55 16.92 +69 02 17.7  20.5g    87W   97S    M. Kasliwal
2008-12a   2008 12 09.164  09 55 16.79 +69 02 17.4  20.7U    88W   98S    K. Hornoch
2008-12b   2008 12 29.202  09 55 38.30 +69 01 43.2  18.6U    28E  132S    K. Hornoch

2009-11a   2009 11 24.540  09 55 21.89 +69 03 49.8  20.6r    61W    5S    K. Hornoch
2009-11b   2009 11 24.540  09 54 57.48 +69 06 43.5  22.0r   191W  168N    K. Hornoch
2009-11c   2009 11 13.106  09 55 07.75 +69 08 10.2  19.9R   136W  255N    K. Hornoch
2009-11c   2009 11 25.484  09 55 07.73 +69 08 10.6  21.4r   136W  256N    K. Hornoch

2010-01a   2010 01 10.364  09 55 26.22 +69 06 18.9  21.1r    37W  144N    K. Hornoch
2010-01b   2010 01 14.394  09 55 35.18 +69 03 30.4  20.9r    11E   25S    K. Hornoch
2010-01b   2010 01 17.218  09 55 35.15 +69 03 30.3  18.8H    11E   25S    K. Hornoch
2010-01b   2010 01 21.292  09 55 35.15 +69 03 30.5  21.5r    11E   25S    K. Hornoch
2010-01c   2010 01 30.974  09 55 23.63 +69 05 54.9  21.0R    51W  120N    K. Hornoch
2010-01c   2010 02 04.125  09 55 23.56 +69 05 54.4  20.0H    52W  119N    K. Hornoch

2010-06a   2010 06 11.164  09 55 48.85 +69 03 26.4  21.2R    84E   29S    K. Hornoch
2010-06b   2010 06 11.164  09 55 19.39 +69 06 20.6  21.9R    74W  146N    K. Hornoch
2010-06c   2010 06 14.893  09 55 31.00 +69 04 03.3  19.9H    12W    8N    K. Hornoch
2010-06d   2010 06 14.893  09 55 34.96 +69 03 51.5  20.1H    10E    4S    K. Hornoch

2010-12a   2010 12 05.147  09 55 48.67 +69 03 11.4  20.9U    83E   44S    K. Hornoch
2010-12a   2010 12 05.515  09 55 48.63 +69 03 11.6  21.3R    83E   44S    K. Hornoch


NOTES:

(2003-02a) Discovered by D. Weisz and W. Li (University of California) on unfiltered KAIT images. Spectroscopy by A. Filippenko and R. Chornock on Feb. 27 shows it to be a nova (details on IAUCs 8069, 8086).

(2007-04a) Discovered by K. Hornoch et al. on images taken by P. Cagas (details on CBET 924).

(2007-04b) Discovered by K. Hornoch et al. on images taken by P. Cagas. Spectroscopy by J. Silverman et al. on Apr. 15 showed a nearly featureless blue continuum with wide H-alpha absorption (details on CBETs 924, 938).

(2008-03a) Discovered by K. Hornoch (details on CBET 1281).

(2008-09a) Discovered by M. M. Kasliwal et al. Spectroscopy shows it to be a "Fe II"-type nova (details on CBET 1528).

(2008-12a) Discovered by M. M. Kasliwal et al., and independently by Kamil Hornoch (details on CBET 1632).

(2008-12b) Discovered by Kamil Hornoch and P. Sedinova (details on CBET 1653).

(2009-11a) Discovered by Kamil Hornoch and Ondrej Pejcha (details on CBETs 2051, 2063, 2132).

(2009-11b) Discovered by Kamil Hornoch and Ondrej Pejcha (details on CBETs 2051, 2063, 2132).

(2009-11c) Discovered by Kamil Hornoch and Ondrej Pejcha (details on CBETs 2063, 2132).

(2010-01a) Discovered by Kamil Hornoch et al. (details on CBETs 2132, 2170).

(2010-01b) Discovered by Kamil Hornoch et al. (details on CBET 2170).

(2010-01c) Discovered by Kamil Hornoch et al. (details on CBET 2180).

(2010-06a) Discovered by Kamil Hornoch et al. (details on CBETs 2332, 2338).

(2010-06b) Discovered by Kamil Hornoch et al. (details on CBETs 2332, 2338).

(2010-06c) Discovered by Kamil Hornoch et al. (details on CBET 2338).

(2010-06d) Discovered by Kamil Hornoch et al. (details on CBET 2338).

(2010-12a) Discovered by Kamil Hornoch, Astronomical Institute, Ondrejov; and Peter Garnavich and James Pagnini, University of Notre Dame, on a co-added 2970-s unfiltered CCD frame taken by Hornoch on Dec. 5.147 UT with the 0.65-m telescope at Ondrejov and on a co-added 580-s R-band CCD frame taken by Garnavich and Pagnini with the Vatt4k imager on the 1.83-m Vatican Advanced Technology Telescope on Dec. 5.515 UT. Details on CBET 2576.


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