VizieR

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VizieR

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II/354/hipext HIP and TGAS stars reddening and extinction (Gontcharov+ 2018)
E(J-Ks), E(B-V), Rv and Av for Hipparcos stars, not in Gaia DR1 TGAS (19259 rows)
  recno=692
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ColumnValue  Explain   (UCD)
_RAJ200000 54 17.592 "h:m:s" Right ascension (FK5, Equinox=J2000.0) at Epoch=J1991.25 (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)
_DEJ2000-08 44 25.80 "d:m:s" Declination (FK5, Equinox=J2000.0) at Epoch=J1991.25 (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 51 46.219 "h:m:s" Right ascension (FK4, Equinox=B1950.0) at Epoch=J1991.25 (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)
_DEB1950-09 00 41.25 "d:m:s" Declination (FK4, Equinox=B1950.0) at Epoch=J1991.25 (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)
_Glon125.167580 deg Galactic longitude at Epoch=J1991.25 (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-71.599853 deg Galactic latitude at Epoch=J1991.25 (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)
692recno 692  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

HIP 4257  Hipparcos (Cat. I/311) identifier (meta.id)
RA_ICRS013.5733 deg (i) Approximate right ascension (ICRS) at epoch 1991.25 (Note G6)   (pos.eq.ra;meta.main)
DE_ICRS-08.7405 deg (i) Approximate declination (ICRS) at epoch 1991.25 (Note G6)   (pos.eq.dec;meta.main)
GLON125.1675 deg Approximate Galactic longitude at epoch 1991.25 (Note G6)   (pos.galactic.lon)
GLAT-71.5999 deg Approximate Galactic latitude at epoch 1991.25 (Note G6)   (pos.galactic.lat)
E(J-Ks) 0.02 mag [0.00,0.24] E(J-Ks) reddening (Note G7)   (phot.color.excess)
E(B-V) 0.04 mag [0.00,0.40] E(B-V) reddening (Note G3)   (phot.color.excess)
Rv 3.75   [2.16,4.07] Rv total-to-selective extinction ratio (Note G4)   (phys.absorption.gal;arith.ratio)
Av 0.14 mag [0.00,1.15] Av interstellar extinction (Note G5)   (phys.absorption)

SimbadSimbad  ask the Simbad data-base about this object (meta.ref.url)
_RA.icrs013.5733 deg (i) Right Ascension (ICRS, epoch 2000) computed by CDS (pos.eq.ra)
_DE.icrs-08.7405 deg (i) Declination (ICRS, epoch 2000) computed by CDS (pos.eq.dec)
  
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