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VizieR

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VII/110A/table4 Rich Clusters of Galaxies (Abell+ 1989)
Southern "Abell Catalog" (1364 rows)
  recno=845
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ColumnValue  Explain   (UCD)
_RAJ200013 24 52.8 "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)
_DEJ2000-28 52 37 "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 22 06.0 "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 37 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)
_Glon311.7069 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+33.4245 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)
845recno 845  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

ACO3557  (i) [2713,4076] "Abell" number for the southern rich cluster (meta.id;meta.main)
RAB195013 22.1 "h:m:s" (i) right ascension (B1950) (pos.eq.ra;meta.main)
DEB1950-28 37 "d:m:s" (i) declination (B1950) (pos.eq.dec;meta.main)
FieldF444   [0-9F] the Southern Sky Survey Field number in which the cluster is located (meta.id;obs.field)
Xcen -34 mm rectangular coordinates if the apparent cluster center, referred to the CENTER of the Southern Sky Survey Field (+ = east) (pos.cartesian.x;instr.plate)
Ycen 74 mm same with above (+ = north) (pos.cartesian.y;instr.plate)
AtypeRI   [ IR?:] cluster classification in Abell's system: I = irregu lar, R = regular, IR and RI = intermediate, ":" and "?" see file "docu.txt" (meta.note)
BMtypeI-II   [- I:?] cluster classification in the Bautz-Morgan system (src.class.struct)
Count 36 ct [0,] number of cluster members between m3 and m3+2, corrected for background (meta.number)
u_Count    [:*?)] uncertainty of the Count (meta.code.error;phot.count)
m115.1 mag weighted mean total V mag. estimated for the first-ranked cluster member (no galactic extinction correction has been applied) (phot.mag;em.opt.V)
u_m1    [:?*] ":" = s.d. of more than ±0.5mag "?" = s.d. of more than ±1.0mag "*: = known or probable foreground object (meta.code.error)
m315.9 mag weighted mean total V magnitude estimated for the third-ranked cluster member (again uncorrected) (phot.mag;em.opt.V)
u_m3    [:?*] same with u_m1 (meta.code.error)
m1016.1 mag weighted mean total V magnitude estimated for the tenth-ranked cluster member (again uncorrected) (phot.mag)
u_m10    [:?*] same with u_m1 (meta.code.error)
PrevB   [ BDdKOQRSs] sources of previous listings B = Braid and MacGillivray (1978MNRAS.182..241B), etc. see file "docu.txt" (meta.id)
Xpos198 mm rectangular coordinates of the apparent cluster center, referred to the south-east (lower left) edge of the Southern Sky Survey Field (x coordinate) (pos.cartesian.x;instr.plate)
Ypos238 mm same with above (y coordinate) (pos.cartesian.y;instr.plate)
GLON311.71 deg galactic longitude l2 (pos.galactic.lon)
GLAT 33.42 deg galactic latitude b2 (pos.galactic.lat)
z    cluster redshift from Struble and Rood (1987ApJS...63..555S) (src.redshift)
u_z    [)] uncertainty parenthesis, close (meta.code.error;src.redshift)
Rich0  richness, from Abell (1958ApJS....3..211A) (Note)   (src.class.richness)
Dclass5  distance class, from Abell (Note 1958)   (src.class.distance)
m10A16.5 mag magnitude of the tenth brightest cluster member, corrected for galactic extinction following Abell's formula (phot.mag;arith.diff)
NF_11   [1,4] number of fields in which the cluster was found (meta.number)
Obs_1O   [ACO] observer's initial (A = Abell, C = Corwin, O = Olowin) (obs.observer)
NF_2    [1,4] same with NF_1 (meta.note)
Obs_2    [ACO] same with Obs_1 (meta.note)
NF_3    [1,4] same with NF_1 (meta.note)
Obs_3    [ACO] same with Obs_1 (meta.note)

_RA.icrs13 24.9 "h:m:s" (i) Right ascension (ICRS) (computed by VizieR, not part of the original data) (pos.eq.ra)
_DE.icrs-28 53 "d:m:s" (i) Declination (ICRS) (computed by VizieR, not part of the original data) (pos.eq.dec)
  
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