VizieR

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VizieR

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J/ApJS/184/138/table3 XID II: RASS/BSC-2MASS/PSC cross-association (Haakonsen+, 2009)
Association catalog (18806 rows)
  recno=612
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ColumnValue  Explain   (UCD)
_RAJ200000 42 42.800 "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+40 51 56.00 "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)
_RAB195000 39 58.712 "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+40 35 30.43 "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)
_Glon121.153334 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-21.976062 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)
612recno 612  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

1RXSJ004242.8+405156  RASS/BSC source name (JHHMMSS.s+DDMMSS) (linked to 1RXS data) (meta.id;meta.main)
objG  SIMBAD object type of RASS/BSC source (src.class)
xrt 0.11 ct/s RASS/BSC source count rate (phot.count;em.X-ray)
e_xrt 0.02 ct/s RASS/BSC source count rate uncertainty (stat.error)
P(noid) 0.005  Probability of no association (Note 1)   (stat.probability)
2MASSJ00424182+4051547   2MASS/PSC source name (JHHMMSSss+DDMMSSs) (linked to 2MASS data) (meta.id.cross)
obj2    SIMBAD object type of 2MASS/PSC source (src.class)
Jmag 8.7 mag 2MASS/PSC source J-band magnitude (phot.mag;em.IR.J)
P(id) 0.486   Probability of unique association (Note 1)   (stat.probability)

SimbadSimbad  ask the Simbad data-base about this object
_RA010.6783 deg (i) Positions from 1RXS name (right ascension part) (pos.eq.ra;meta.main)
_DE+40.8656 deg (i) Positions from 1RXS name (declination part) (pos.eq.dec;meta.main)
  
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