SNE_HIST (G0): Extragalactic Supernovae: 1885A-1995G (19950304)
FILE:
sne_hist.g0 (899 galaxies)
sne_hist.g0n (notefile)
CONTENTS: Historical Extragalactic Supernovae: 1885A-1995G
DATASET: This file comes in HyperSky dataset G-8 (G-8.1), Availability on HyperSky CD-ROM: Vol. 1 (1993), version 19930107, Vol. 2 (1995), version 19950304
DESCRIPTION: This datafile contains all galaxies known to have produced supernovae between 1885 (when the first recognized extragalactic supernova was observed in M31) and supernova 1995G. The data comes from two sources. Most supernovae from 1885A through 1989L are taken from a file based on the "Asiago Supernova Catalog". For details, see R. Barbon, E. Cappellaro and M. Turatto in ASTRON. and ASTROPHYS. SUPPL. 81, 421, 1989. Supernovae since 1989L have been extracted from IAU (International Astronomical Union) circulars. IAU circulars occasionally include new discoveries of supernovae on old survey plates. Thus, not all supernovae with designations prior to 1989L are in the Asiago catalog.
Some 15 supernovae are missing in the sequence from 1885A to 1991bd. The Asiago catalog comments on these missing objects as follows: "Finally, it is worthwhile to remark that when inspecting the catalog by date, some SNe appear to be missing; these refer to cases in which the object turned out not to be a supernova." For example, SN 1983H is in fact a superposed star.
Obviously, such a datafile cannot remain current due to ongoing discoveries of new supernovae. Consequently, plans are to update the datafile roughly annually to reflect new discoveries.
DATA:
POSITION: Right Ascension and Declination of the host galaxy.
MAG: magnitude of the host galaxy, taken from various sources as available. Unless otherwise indicated, it will usually be the visual magnitude.
TYPE: a brief 2-character code indicating the galaxy type. The first letter in all cases will be 'G' indicating a galaxy. The second letter is coded as follows: 'e'=elliptical; 'i'=irregular; 'p'=peculiar; 's'=spiral; 'x'=general.
IDENTIFICATION: the host galaxy identification. Most are NGC (New General Catalog) numbers, some are IC (Index Catalog) numbers, and a few are MCG (Morphological Catalog of Galaxies) or UGC (Uppsala Galaxy Catalog) names. Anonymous faint host galaxies for supernovae occurring prior to 1995 are given names of the form Ahhmm+dd, where 'A' stand for anonymous and "hhmm+dd" will be numbers representing the approximate equinox 1950 galaxy position. This is discontinued starting in 1995, when positions began to be regularly reported using equinox 2000 coordinates.
COMMENTS: For some galaxies, the first comment line may contain additional galaxy identification information, which can include the Hubble type and possibly alternate names. For some anonymous galaxies, alternate names prefaced with the string "*=" indicate identificatons made with HyperSky which are probable but not guaranteed. PGC (Principal Catalog of Galaxies) identifications are followed by the PGC galaxy magnitude in parentheses. Finally on the galaxy id line may be a two-letter code starting with 'm' to indicate the type of magnitude given for the galaxy; for example, "mB" would indicate a blue magnitude. If no such code appears, the galaxy magnitude will usually be visual.
Following the galaxy id line (if any) there will be one comment line for each supernova observed in the galaxy. Each such line will begin with the letters "SN", followed by the supernova designation and the maximum supernova magnitude. An example is "SN 1990T, 16.5".
NOTEFILE: The notefile contains extended information for each supernova. Typically there will be one line for each supernova containing the following comma-separated information: supernova designation, month [and date] of discovery, supernova type, maximum magnitude, magnitude type, discover[s]. For some supernovae, following the discoverers in parentheses will be a list of IAU circulars in which the supernova is described.
HIGHLIGHTS: Galaxies which have produced multiple supernovae are of particular interest to observers. 57 of the 899 galaxies in this datafile have produced 2 or more supernovae (to date). Of these, 9 have produced 3 or more and are listed below. Shown are the galaxy name, position (2000), galaxy magnitude, number of supernovae, brightest supernova magnitude, and the most recent supernova (+magnitude).
GALAXY RA (hm) Dec(dm) Mag #SN SN Mag Most Recent SN
NGC 2276=Arp 114 07 27.4 +85 45 11.4 4 15.7 SN 1993X (16.3)
NGC 2841 09 22.0 +50 58 9.3 3 13. SN 1972R (16.0)
NGC 3184 10 18.3 +41 25 9.8 3 11.0 SN 1937F (13.7)
NGC 4254=M99 12 18.8 +14 25 9.8 3 14.0 SN 1986I (14.2)
NGC 4303=M61 12 21.9 +04 28 9.7 3 12.0 SN 1964F (12.0)
NGC 4321=M100 12 22.9 +15 49 9.4 4 11.6 SN 1979C (11.6)
NGC 4374=M84 12 25.1 +12 53 9.3 3 12.2 SN 1991bg (14.0)
NGC 5236=M83 13 37.0 -29 52 8.2 6 11.6 SN 1983N (11.6)
NGC 6946=Arp 29 20 34.8 +60 09 8.9 6 11.6 SN 1980K (11.6)
A small additional datafile, SNE_MULT.G0, has been included in dataset G-8. This set is a subset of SNE_HIST.G0, and contains the 57 galaxies which have produced 2 or more supernovae to date.