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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=498192
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ColumnValue  Explain   (UCD)
_RAJ200013 52 12.74400 "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+31 27 38.6500 "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 49 58.10693 "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+31 42 25.0594 "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)
_Glon054.67090847 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+76.07382032 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)
498192recno 498192  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

RAJ2000208.053100 deg (i) Right Ascension in decimal degrees (J2000) (pos.eq.ra;meta.main)
DEJ2000+31.460736 deg (i) Declination in decimal degrees (J2000) (pos.eq.dec;meta.main)
Sp 25.46 mJy 1.4GHz peak flux (phot.flux.density;em.radio.750-1500MHz)
e_Sp 0.98 mJy The rms in PFlux (stat.error;src.spType)
Nobs 4  Number of observations (meta.number)
t2449662.469 d Mean Julian day of the observation (Note 1)   (time.epoch;obs;stat.mean)
dt 516.562 d Time span of the observations δt (Note 1)   (time.interval)

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

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