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VizieR

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VII/110A/table3 Rich Clusters of Galaxies (Abell+ 1989)
Revised northern "Abell Catalog" (2712 rows)
  recno=1451
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ColumnValue  Explain   (UCD)
_RAJ200012 03 16.0 "h:m:s" Right ascension (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra)
_DEJ2000-21 30 42 "d:m:s" Declination (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec)
_RAB195012 00 42.0 "h:m:s" Right ascension (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra)
_DEB1950-21 14 00 "d:m:s" Declination (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec)
_Glon288.2572 deg Galactic longitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lon)
_Glat+39.9834 deg Galactic latitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lat)
1451recno 1451  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

ACO1451  (i) [1,2712] "Abell" number (meta.id;meta.main)
RAB195012 00.7 "h:m:s" (i) right ascension (B1950) (pos.eq.ra;meta.main)
DEB1950-21 14 "d:m:s" (i) declination (B1950) (pos.eq.dec;meta.main)
BMtypeIII   [- I:] cluster classification in the Bautz- Morgan system (src.class.struct)
Count131 ct [0,] number of cluster members between m3 and m3+2, corrected for background (meta.number)
Xpos225 mm rectangular coordinates of the apparent cluster center, referred to the south-east (lower left) edge of the Palomar Sky Survey prints (x coordinate) (pos.cartesian.x;instr.plate)
Ypos 28 mm same with above (y coordinate) (pos.cartesian.y;instr.plate)
GLON288.26 deg galactic longitude l2 (pos.galactic.lon)
GLAT 39.98 deg galactic latitude b2 (pos.galactic.lat)
z    cluster redshift from Struble and Rood (1987ApJS...63..555S) (src.redshift)
Rich3  richness, from Abell (1958ApJS....3..211A) (Note)   (src.class.richness)
Dclass6  distance class, from Abell (Note 1958)   (src.class.distance)
m1017.3 mag red magnitude of the tenth brightest cluster member, from Abell (1958) (phot.mag)

_RA.icrs12 03.3 "h:m:s" (i) Right ascension (ICRS) (computed by VizieR, not part of the original data) (pos.eq.ra)
_DE.icrs-21 31 "d:m:s" (i) Declination (ICRS) (computed by VizieR, not part of the original data) (pos.eq.dec)
  
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