7192 VII/192 Arp's Peculiar Galaxies D Webb SKY & Telescope 92-1 92 1996 1996S&T....92...92W Galaxy catalogs Historical catalog Halton C. Arp photographed 338 views of notable peculiar galaxies and published them as his 1966 "Atlas of Peculiar Galaxies." Since then, galaxy catalogs have named 585 of the involved galaxies. This contemporary index collects names and characteristics of the involved objects for use by contemporary observers of the historical views.

The galaxies identified in Arp's Atlas of Peculiar Galaxies represent a remarkable cross-section of observing opportunities. With the wide availability of inexpensive CCD cameras and increasing aperture of inexpensive commercial telescopes, more of the Arp list is accessible to more observers. Many of the objects so catalogued were anonymous galaxies in 1966 and have subsequently been characterized and named. The NASA-IPAC Extragalactic Database (NED) provided most correlations and other sources identified others. Please refer to http://users.aol.com/arpgalaxy for further information.

Arp_no Arp number from original catalog number= The Name is the most common name of the brightest galaxy in the view or the common name of the group of interacting galaxies. Where the view is a main galaxy with companion, both names are indicated with the companion in abbreviated form. The Right Ascension and Declination is of the brightest galaxy and not the center of Arp's original photo. number= Size is the longest dimension of the rectangular field of view of the image published in Arp's 1966 Atlas. This information is provided to assist the observer in framing the view for imaging. number= Orientation is the alignment of the top (narrow side) of Arp's original photo. For example, "E" means the published photo is a rectangle with the long side running east to west with east at the top. number= This table identifies all named galaxies involved in Arp's Atlas of Peculiar Galaxies. It is provided in Right Ascension sequence with all of the galaxies in a given Arp view together. Occasionally a galaxy from one Arp view will intervene between galaxies of another Arp view, due to both Arp's location at the same Right Ascension. Observational attributes for each such galaxy are provided as well. --- Name Common name (group or brightest) The Name is the most common name of the brightest galaxy in the view or the common name of the group of interacting galaxies. Where the view is a main galaxy with companion, both names are indicated with the companion in abbreviated form. The Right Ascension and Declination is of the brightest galaxy and not the center of Arp's original photo. number= The Name is the most common name of the brightest galaxy in the view or the common name of the group of interacting galaxies. Where the view is a main galaxy with companion, both names are indicated with the companion in abbreviated form. The Right Ascension and Declination is of the brightest galaxy and not the center of Arp's original photo. number= Size is the longest dimension of the rectangular field of view of the image published in Arp's 1966 Atlas. This information is provided to assist the observer in framing the view for imaging. number= Orientation is the alignment of the top (narrow side) of Arp's original photo. For example, "E" means the published photo is a rectangle with the long side running east to west with east at the top. number= This table identifies all named galaxies involved in Arp's Atlas of Peculiar Galaxies. It is provided in Right Ascension sequence with all of the galaxies in a given Arp view together. Occasionally a galaxy from one Arp view will intervene between galaxies of another Arp view, due to both Arp's location at the same Right Ascension. Observational attributes for each such galaxy are provided as well. --- Rah Right Ascension 2000 (hours) number= The Name is the most common name of the brightest galaxy in the view or the common name of the group of interacting galaxies. Where the view is a main galaxy with companion, both names are indicated with the companion in abbreviated form. The Right Ascension and Declination is of the brightest galaxy and not the center of Arp's original photo. number= Size is the longest dimension of the rectangular field of view of the image published in Arp's 1966 Atlas. This information is provided to assist the observer in framing the view for imaging. number= Orientation is the alignment of the top (narrow side) of Arp's original photo. For example, "E" means the published photo is a rectangle with the long side running east to west with east at the top. number= This table identifies all named galaxies involved in Arp's Atlas of Peculiar Galaxies. It is provided in Right Ascension sequence with all of the galaxies in a given Arp view together. Occasionally a galaxy from one Arp view will intervene between galaxies of another Arp view, due to both Arp's location at the same Right Ascension. Observational attributes for each such galaxy are provided as well. h RAm Right Ascension 2000 (minutes) number= The Name is the most common name of the brightest galaxy in the view or the common name of the group of interacting galaxies. Where the view is a main galaxy with companion, both names are indicated with the companion in abbreviated form. The Right Ascension and Declination is of the brightest galaxy and not the center of Arp's original photo. number= Size is the longest dimension of the rectangular field of view of the image published in Arp's 1966 Atlas. This information is provided to assist the observer in framing the view for imaging. number= Orientation is the alignment of the top (narrow side) of Arp's original photo. For example, "E" means the published photo is a rectangle with the long side running east to west with east at the top. number= This table identifies all named galaxies involved in Arp's Atlas of Peculiar Galaxies. It is provided in Right Ascension sequence with all of the galaxies in a given Arp view together. Occasionally a galaxy from one Arp view will intervene between galaxies of another Arp view, due to both Arp's location at the same Right Ascension. Observational attributes for each such galaxy are provided as well. min DE- Declination 2000 (sign) number= The Name is the most common name of the brightest galaxy in the view or the common name of the group of interacting galaxies. Where the view is a main galaxy with companion, both names are indicated with the companion in abbreviated form. The Right Ascension and Declination is of the brightest galaxy and not the center of Arp's original photo. number= Size is the longest dimension of the rectangular field of view of the image published in Arp's 1966 Atlas. This information is provided to assist the observer in framing the view for imaging. number= Orientation is the alignment of the top (narrow side) of Arp's original photo. For example, "E" means the published photo is a rectangle with the long side running east to west with east at the top. number= This table identifies all named galaxies involved in Arp's Atlas of Peculiar Galaxies. It is provided in Right Ascension sequence with all of the galaxies in a given Arp view together. Occasionally a galaxy from one Arp view will intervene between galaxies of another Arp view, due to both Arp's location at the same Right Ascension. Observational attributes for each such galaxy are provided as well. --- DEd Declination 2000 (degrees) number= The Name is the most common name of the brightest galaxy in the view or the common name of the group of interacting galaxies. Where the view is a main galaxy with companion, both names are indicated with the companion in abbreviated form. The Right Ascension and Declination is of the brightest galaxy and not the center of Arp's original photo. number= Size is the longest dimension of the rectangular field of view of the image published in Arp's 1966 Atlas. This information is provided to assist the observer in framing the view for imaging. number= Orientation is the alignment of the top (narrow side) of Arp's original photo. For example, "E" means the published photo is a rectangle with the long side running east to west with east at the top. number= This table identifies all named galaxies involved in Arp's Atlas of Peculiar Galaxies. It is provided in Right Ascension sequence with all of the galaxies in a given Arp view together. Occasionally a galaxy from one Arp view will intervene between galaxies of another Arp view, due to both Arp's location at the same Right Ascension. Observational attributes for each such galaxy are provided as well. deg DEm Declination 2000 (minutes) number= The Name is the most common name of the brightest galaxy in the view or the common name of the group of interacting galaxies. Where the view is a main galaxy with companion, both names are indicated with the companion in abbreviated form. The Right Ascension and Declination is of the brightest galaxy and not the center of Arp's original photo. number= Size is the longest dimension of the rectangular field of view of the image published in Arp's 1966 Atlas. This information is provided to assist the observer in framing the view for imaging. number= Orientation is the alignment of the top (narrow side) of Arp's original photo. For example, "E" means the published photo is a rectangle with the long side running east to west with east at the top. number= This table identifies all named galaxies involved in Arp's Atlas of Peculiar Galaxies. It is provided in Right Ascension sequence with all of the galaxies in a given Arp view together. Occasionally a galaxy from one Arp view will intervene between galaxies of another Arp view, due to both Arp's location at the same Right Ascension. Observational attributes for each such galaxy are provided as well. arcmin Size Long dimension of Arp's original photo Size is the longest dimension of the rectangular field of view of the image published in Arp's 1966 Atlas. This information is provided to assist the observer in framing the view for imaging. number= The Name is the most common name of the brightest galaxy in the view or the common name of the group of interacting galaxies. Where the view is a main galaxy with companion, both names are indicated with the companion in abbreviated form. The Right Ascension and Declination is of the brightest galaxy and not the center of Arp's original photo. number= Size is the longest dimension of the rectangular field of view of the image published in Arp's 1966 Atlas. This information is provided to assist the observer in framing the view for imaging. number= Orientation is the alignment of the top (narrow side) of Arp's original photo. For example, "E" means the published photo is a rectangle with the long side running east to west with east at the top. number= This table identifies all named galaxies involved in Arp's Atlas of Peculiar Galaxies. It is provided in Right Ascension sequence with all of the galaxies in a given Arp view together. Occasionally a galaxy from one Arp view will intervene between galaxies of another Arp view, due to both Arp's location at the same Right Ascension. Observational attributes for each such galaxy are provided as well. arcmin Orient Orientation of Arp photo Orientation is the alignment of the top (narrow side) of Arp's original photo. For example, "E" means the published photo is a rectangle with the long side running east to west with east at the top. number= The Name is the most common name of the brightest galaxy in the view or the common name of the group of interacting galaxies. Where the view is a main galaxy with companion, both names are indicated with the companion in abbreviated form. The Right Ascension and Declination is of the brightest galaxy and not the center of Arp's original photo. number= Size is the longest dimension of the rectangular field of view of the image published in Arp's 1966 Atlas. This information is provided to assist the observer in framing the view for imaging. number= Orientation is the alignment of the top (narrow side) of Arp's original photo. For example, "E" means the published photo is a rectangle with the long side running east to west with east at the top. number= This table identifies all named galaxies involved in Arp's Atlas of Peculiar Galaxies. It is provided in Right Ascension sequence with all of the galaxies in a given Arp view together. Occasionally a galaxy from one Arp view will intervene between galaxies of another Arp view, due to both Arp's location at the same Right Ascension. Observational attributes for each such galaxy are provided as well. --- fl_245 Focal length for CB245 CCD Camera number=1 These three columns are the focal lengths in inches of the optical system necessary to duplicate Arp's original image using the named CCD camera. 2.54cm fl_ST6 Focal length for SBIG ST6 CCD Camera number=1 These three columns are the focal lengths in inches of the optical system necessary to duplicate Arp's original image using the named CCD camera. 2.54cm fl_ST5 Focal length for SBIG ST5 CCD Camera number=1 These three columns are the focal lengths in inches of the optical system necessary to duplicate Arp's original image using the named CCD camera. 2.54cm Arp_no Arp number from original catalog number= Magnitude sources and types vary. In general, where the galaxy appears in Uranometria, the Deep Sky Field Guide's algorithm for computing VT is assumed. Where the galaxy is not so listed, a variety of magnitudes are used but not distinguished or recorded. Sources include predominantly RC3 and PGC. number= Where available, the long form mixed case Hubble morphological type (SB(rs)bc) is provided. In some cases the simplified all caps form (IBS9P) is used. Where no such designation was available, some sources provide a phrase like "disturbed", "DBL SYS" or "Multiple Sys". number= Galaxies listed in the Uranometria 2000.0 Deep Sky Field Guide are indicated by reference to the chart number. Those galaxies so listed which do not appear on the chart are field galaxies listed in the Field Guide's notes column. --- Name Common name of galaxy number= Magnitude sources and types vary. In general, where the galaxy appears in Uranometria, the Deep Sky Field Guide's algorithm for computing VT is assumed. Where the galaxy is not so listed, a variety of magnitudes are used but not distinguished or recorded. Sources include predominantly RC3 and PGC. number= Where available, the long form mixed case Hubble morphological type (SB(rs)bc) is provided. In some cases the simplified all caps form (IBS9P) is used. Where no such designation was available, some sources provide a phrase like "disturbed", "DBL SYS" or "Multiple Sys". number= Galaxies listed in the Uranometria 2000.0 Deep Sky Field Guide are indicated by reference to the chart number. Those galaxies so listed which do not appear on the chart are field galaxies listed in the Field Guide's notes column. --- VT Total V-magnitude Magnitude sources and types vary. In general, where the galaxy appears in Uranometria, the Deep Sky Field Guide's algorithm for computing VT is assumed. Where the galaxy is not so listed, a variety of magnitudes are used but not distinguished or recorded. Sources include predominantly RC3 and PGC. number= Magnitude sources and types vary. In general, where the galaxy appears in Uranometria, the Deep Sky Field Guide's algorithm for computing VT is assumed. Where the galaxy is not so listed, a variety of magnitudes are used but not distinguished or recorded. Sources include predominantly RC3 and PGC. number= Where available, the long form mixed case Hubble morphological type (SB(rs)bc) is provided. In some cases the simplified all caps form (IBS9P) is used. Where no such designation was available, some sources provide a phrase like "disturbed", "DBL SYS" or "Multiple Sys". number= Galaxies listed in the Uranometria 2000.0 Deep Sky Field Guide are indicated by reference to the chart number. Those galaxies so listed which do not appear on the chart are field galaxies listed in the Field Guide's notes column. mag u_VT Uncertain magnitude = ? number= Magnitude sources and types vary. In general, where the galaxy appears in Uranometria, the Deep Sky Field Guide's algorithm for computing VT is assumed. Where the galaxy is not so listed, a variety of magnitudes are used but not distinguished or recorded. Sources include predominantly RC3 and PGC. number= Where available, the long form mixed case Hubble morphological type (SB(rs)bc) is provided. In some cases the simplified all caps form (IBS9P) is used. Where no such designation was available, some sources provide a phrase like "disturbed", "DBL SYS" or "Multiple Sys". number= Galaxies listed in the Uranometria 2000.0 Deep Sky Field Guide are indicated by reference to the chart number. Those galaxies so listed which do not appear on the chart are field galaxies listed in the Field Guide's notes column. --- size_g Dimensions of galaxy number= Magnitude sources and types vary. In general, where the galaxy appears in Uranometria, the Deep Sky Field Guide's algorithm for computing VT is assumed. Where the galaxy is not so listed, a variety of magnitudes are used but not distinguished or recorded. Sources include predominantly RC3 and PGC. number= Where available, the long form mixed case Hubble morphological type (SB(rs)bc) is provided. In some cases the simplified all caps form (IBS9P) is used. Where no such designation was available, some sources provide a phrase like "disturbed", "DBL SYS" or "Multiple Sys". number= Galaxies listed in the Uranometria 2000.0 Deep Sky Field Guide are indicated by reference to the chart number. Those galaxies so listed which do not appear on the chart are field galaxies listed in the Field Guide's notes column. --- u_size_g Uncertain size = ? number= Magnitude sources and types vary. In general, where the galaxy appears in Uranometria, the Deep Sky Field Guide's algorithm for computing VT is assumed. Where the galaxy is not so listed, a variety of magnitudes are used but not distinguished or recorded. Sources include predominantly RC3 and PGC. number= Where available, the long form mixed case Hubble morphological type (SB(rs)bc) is provided. In some cases the simplified all caps form (IBS9P) is used. Where no such designation was available, some sources provide a phrase like "disturbed", "DBL SYS" or "Multiple Sys". number= Galaxies listed in the Uranometria 2000.0 Deep Sky Field Guide are indicated by reference to the chart number. Those galaxies so listed which do not appear on the chart are field galaxies listed in the Field Guide's notes column. --- MType Morphological Type Where available, the long form mixed case Hubble morphological type (SB(rs)bc) is provided. In some cases the simplified all caps form (IBS9P) is used. Where no such designation was available, some sources provide a phrase like "disturbed", "DBL SYS" or "Multiple Sys". number= Magnitude sources and types vary. In general, where the galaxy appears in Uranometria, the Deep Sky Field Guide's algorithm for computing VT is assumed. Where the galaxy is not so listed, a variety of magnitudes are used but not distinguished or recorded. Sources include predominantly RC3 and PGC. number= Where available, the long form mixed case Hubble morphological type (SB(rs)bc) is provided. In some cases the simplified all caps form (IBS9P) is used. Where no such designation was available, some sources provide a phrase like "disturbed", "DBL SYS" or "Multiple Sys". number= Galaxies listed in the Uranometria 2000.0 Deep Sky Field Guide are indicated by reference to the chart number. Those galaxies so listed which do not appear on the chart are field galaxies listed in the Field Guide's notes column. --- Uchart Uranometria chart number Galaxies listed in the Uranometria 2000.0 Deep Sky Field Guide are indicated by reference to the chart number. Those galaxies so listed which do not appear on the chart are field galaxies listed in the Field Guide's notes column. number= Magnitude sources and types vary. In general, where the galaxy appears in Uranometria, the Deep Sky Field Guide's algorithm for computing VT is assumed. Where the galaxy is not so listed, a variety of magnitudes are used but not distinguished or recorded. Sources include predominantly RC3 and PGC. number= Where available, the long form mixed case Hubble morphological type (SB(rs)bc) is provided. In some cases the simplified all caps form (IBS9P) is used. Where no such designation was available, some sources provide a phrase like "disturbed", "DBL SYS" or "Multiple Sys". number= Galaxies listed in the Uranometria 2000.0 Deep Sky Field Guide are indicated by reference to the chart number. Those galaxies so listed which do not appear on the chart are field galaxies listed in the Field Guide's notes column. --- RAh Right Ascension 2000 (hours) number= Magnitude sources and types vary. In general, where the galaxy appears in Uranometria, the Deep Sky Field Guide's algorithm for computing VT is assumed. Where the galaxy is not so listed, a variety of magnitudes are used but not distinguished or recorded. Sources include predominantly RC3 and PGC. number= Where available, the long form mixed case Hubble morphological type (SB(rs)bc) is provided. In some cases the simplified all caps form (IBS9P) is used. Where no such designation was available, some sources provide a phrase like "disturbed", "DBL SYS" or "Multiple Sys". number= Galaxies listed in the Uranometria 2000.0 Deep Sky Field Guide are indicated by reference to the chart number. Those galaxies so listed which do not appear on the chart are field galaxies listed in the Field Guide's notes column. h RAm Right Ascension 2000 (minutes) number= Magnitude sources and types vary. In general, where the galaxy appears in Uranometria, the Deep Sky Field Guide's algorithm for computing VT is assumed. Where the galaxy is not so listed, a variety of magnitudes are used but not distinguished or recorded. Sources include predominantly RC3 and PGC. number= Where available, the long form mixed case Hubble morphological type (SB(rs)bc) is provided. In some cases the simplified all caps form (IBS9P) is used. Where no such designation was available, some sources provide a phrase like "disturbed", "DBL SYS" or "Multiple Sys". number= Galaxies listed in the Uranometria 2000.0 Deep Sky Field Guide are indicated by reference to the chart number. Those galaxies so listed which do not appear on the chart are field galaxies listed in the Field Guide's notes column. min RAs Right Ascension 2000 (seconds) number= Magnitude sources and types vary. In general, where the galaxy appears in Uranometria, the Deep Sky Field Guide's algorithm for computing VT is assumed. Where the galaxy is not so listed, a variety of magnitudes are used but not distinguished or recorded. Sources include predominantly RC3 and PGC. number= Where available, the long form mixed case Hubble morphological type (SB(rs)bc) is provided. In some cases the simplified all caps form (IBS9P) is used. Where no such designation was available, some sources provide a phrase like "disturbed", "DBL SYS" or "Multiple Sys". number= Galaxies listed in the Uranometria 2000.0 Deep Sky Field Guide are indicated by reference to the chart number. Those galaxies so listed which do not appear on the chart are field galaxies listed in the Field Guide's notes column. s DE- Declination 2000 (sign) number= Magnitude sources and types vary. In general, where the galaxy appears in Uranometria, the Deep Sky Field Guide's algorithm for computing VT is assumed. Where the galaxy is not so listed, a variety of magnitudes are used but not distinguished or recorded. Sources include predominantly RC3 and PGC. number= Where available, the long form mixed case Hubble morphological type (SB(rs)bc) is provided. In some cases the simplified all caps form (IBS9P) is used. Where no such designation was available, some sources provide a phrase like "disturbed", "DBL SYS" or "Multiple Sys". number= Galaxies listed in the Uranometria 2000.0 Deep Sky Field Guide are indicated by reference to the chart number. Those galaxies so listed which do not appear on the chart are field galaxies listed in the Field Guide's notes column. --- DEd Declination 2000 (degrees) number= Magnitude sources and types vary. In general, where the galaxy appears in Uranometria, the Deep Sky Field Guide's algorithm for computing VT is assumed. Where the galaxy is not so listed, a variety of magnitudes are used but not distinguished or recorded. Sources include predominantly RC3 and PGC. number= Where available, the long form mixed case Hubble morphological type (SB(rs)bc) is provided. In some cases the simplified all caps form (IBS9P) is used. Where no such designation was available, some sources provide a phrase like "disturbed", "DBL SYS" or "Multiple Sys". number= Galaxies listed in the Uranometria 2000.0 Deep Sky Field Guide are indicated by reference to the chart number. Those galaxies so listed which do not appear on the chart are field galaxies listed in the Field Guide's notes column. deg DEm Declination 2000 (minutes) number= Magnitude sources and types vary. In general, where the galaxy appears in Uranometria, the Deep Sky Field Guide's algorithm for computing VT is assumed. Where the galaxy is not so listed, a variety of magnitudes are used but not distinguished or recorded. Sources include predominantly RC3 and PGC. number= Where available, the long form mixed case Hubble morphological type (SB(rs)bc) is provided. In some cases the simplified all caps form (IBS9P) is used. Where no such designation was available, some sources provide a phrase like "disturbed", "DBL SYS" or "Multiple Sys". number= Galaxies listed in the Uranometria 2000.0 Deep Sky Field Guide are indicated by reference to the chart number. Those galaxies so listed which do not appear on the chart are field galaxies listed in the Field Guide's notes column. arcmin DEs Declination 2000 (seconds) number= Magnitude sources and types vary. In general, where the galaxy appears in Uranometria, the Deep Sky Field Guide's algorithm for computing VT is assumed. Where the galaxy is not so listed, a variety of magnitudes are used but not distinguished or recorded. Sources include predominantly RC3 and PGC. number= Where available, the long form mixed case Hubble morphological type (SB(rs)bc) is provided. In some cases the simplified all caps form (IBS9P) is used. Where no such designation was available, some sources provide a phrase like "disturbed", "DBL SYS" or "Multiple Sys". number= Galaxies listed in the Uranometria 2000.0 Deep Sky Field Guide are indicated by reference to the chart number. Those galaxies so listed which do not appear on the chart are field galaxies listed in the Field Guide's notes column. arcsec Dennis Webb Johnson Space Center Astro. Society 1996Jul19This Research Made Use Of The Nasa/Ipac Extragalactic Database (Ned) Which Is Operated By The Jet Propulsion Laboratory, Caltech, Under Contract With The National Aeronautics And Space Administration Al Kelly computed image sizes and required focal lengths for contemporary CCD cameras. He also photographed a few to verify that amateur CCD cameras can see faint peculiarity. Mike Brown loaded galaxy size information and audited the list against the MegaStar Deep Sky Atlas database (RC3 and PGC) Emil Bonanno precessed coordinates from epochs 1950 to 2000. Barbara Wilson provided desire, consultation and encouragement. Lara Lenoir audited the list against the Deep Sky Field Guide, and MegaStar (RC3 and PGC). Halton C. Arp for not being offended at the interest in his early work. VII_192.xml