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VizieR

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VII/4A/abell Abell and Zwicky Clusters of Galaxies (Abell+ 1974)
Abell Clusters (Abell, 1958; Corwin, 1974) (2712 rows)
  recno=1831
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ColumnValue  Explain   (UCD)
_RAJ200013 59 10.2 "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+27 59 28 "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)
_RAB195013 56 54.0 "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+28 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)
_Glon040.1375 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+74.9757 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)
1831recno 1831  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

Abell1831  Abell cluster number (meta.id;meta.main)
n_Abell2   [1/2] '2' if in Abell's statistical sample, '1' if not (meta.note)
RA195013 56.9 "h:m:s" (i) Hours RA, 1950.0 (pos.eq.ra;meta.main)
DE1950+28 14 "d:m:s" (i) Degrees Dec, 1950.0 (pos.eq.dec;meta.main)
Mag1015.4 mag Magnitude of 10th brightest cluster member (phot.mag)
DistGroup3   [0/7] Distance group (Note 1)   (pos.distance;pos.lg)
RichGroup1   [0/5] Richness group (Note 2)   (src.class.richness;pos.lg)
GLON 40.15 deg Galactic longitude (pos.galactic.lon)
GLAT 74.97 deg Galactic latitude (pos.galactic.lat)
RLamb 0.2616  Lambert distance from pole (Note 3)   (pos.distance;pos.lambert)
XLamb 0.1687  Lambert X coordinate (Note 3)   (pos.cartesian.x)
YLamb 0.1999  Lambert Y coordinate (Note 3)   (pos.cartesian.y)
SGLON 92.00 deg Supergalactic longitude (de Vaucouleur's system) (pos.supergalactic.lon)
SGLAT 21.22 deg Supergalactic latitude (pos.supergalactic.lat)
ClusRad 0.56 deg Corrected Abell cluster radius (phys.angSize)
ClusArea 0.973 deg2 Cluster area computed from ClusRad (phys.area;meta.modelled)
Pop 66 ct/deg2 Mean apparent population (galaxies/sq.deg) (src.sample;stat.mean)
Dist172 Mpc Radial distance to cluster (pos.distance)
DistX 28 Mpc X component of Distance (pos.distance)
DistY 34 Mpc Y component of Distance (pos.distance)
DistZ 166 Mpc Z component of Distance (pos.distance)

_RA.icrs13 59.2 "h:m:s" (i) Right ascension (ICRS) (computed by VizieR, not part of the original data) (pos.eq.ra)
_DE.icrs+27 59 "d:m:s" (i) Declination (ICRS) (computed by VizieR, not part of the original data) (pos.eq.dec)
  
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