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VizieR

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J/ApJ/737/45/table2 Variable 1.4GHz radio sources from NVSS and FIRST (Ofek+, 2011)
Observing Times of FIRST Sources (816331 rows)
  recno=107749
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ColumnValue  Explain   (UCD)
_RAJ200012 21 15.65593 "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)
_DEJ2000-00 23 11.8610 "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 18 41.86617 "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)
_DEB1950-00 06 33.6593 "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)
_Glon286.93766468 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+61.54446101 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)
107749recno 107749  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

RAJ2000185.315233 deg (i) Right Ascension in decimal degrees (J2000) (pos.eq.ra;meta.main)
DEJ2000-00.386628 deg (i) Declination in decimal degrees (J2000) (pos.eq.dec;meta.main)
Sp 1.22 mJy 1.4GHz peak flux (phot.flux.density;em.radio.750-1500MHz)
e_Sp 0.14 mJy The rms in PFlux (stat.error;src.spType)
Nobs 2  Number of observations (meta.number)
t2451038.963 d Mean Julian day of the observation (Note 1)   (time.epoch;obs;stat.mean)
dt 3.019 d Time span of the observations δt (Note 1)   (time.interval)

FIRSTFIRST  Cross-match with FIRST (Cat. VIII/90) within 1" (meta.ref.url)
  
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