SNE_MULT (G0): Galaxies Producing Multiple Supernovae (19940521)
FILES:
sne_mult.g0 (57 galaxies)
sne_mult.g0n (notefile)
sne_mult.ls (position-list)
CONTENTS: Galaxies which have produced 2 or more supernovae (19940521)
DATASET: This file comes in HyperSky dataset G-8 (G-8.2). Availability on HyperSky CD-ROM: Vol. 1 (1993), version 19930107, Vol. 2 (1995), version 19940521
DESCRIPTION: This datafile is a small subset of historical supernovae file SNE_HIST.G0, and contains only those galaxies from that file which have produced 2 or more supernovae. Because all galaxies in this file are also in SNE_HIST.G0, it is not necessary to install this file unless you are specifically interested in such galaxies. See the SNE_HIST.G0 manual page for additional descriptive information.
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.
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.
POSITION-LIST: If installed, position-list file SNE_MULT.LS will let you center your HyperSky field on multiple-supernova galaxies in SNE_MULT.G0. The list, sorted by Right Ascension, also shows which supernovae have occurred in each galaxy. You can use the position-list to center your HyperSky field on any of these galaxies.
Remember that this is only a position-list; it does not actually display a galaxy at the position you select. The galaxy you select will appear at the position only if you have also loaded SNE_HIST.G0, SNE_MULT.G0, or another catalog datafile which happens to contain the galaxy.