LuytenHS ivo://nasa.heasarc/revisedlhs NASA/GSFC HEASARC Luyten; Bakos, Sahu, Nemeth 2026-04-03 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Star The Revised Luyten Half-Second (LHS) Catalog contains refined coordinates and proper motion data for the high proper motion (HPM) stars listed in the Original Luyten Half-Second (LHS) catalog. The positional uncertainty in the Original LHS catalog is typically >10" and is often >30". The authors of the Revised LHS Catalog used the digital scans of the Palomar Observatory Sky Survey (POSS) I and POSS II plates to derive more accurate positions and proper motions for these objects. Out of the 4470 candidates in the LHS catalog, 4323 objects were manually re-identified in the POSS I and POSS II scans. A small fraction of the stars were not found due to the lack of finder charts and digitized POSS II scans. The uncertainties in the revised positions are typically ~2", but can be as high as ~8" in a few cases, which is a large improvement over the original data. Cross-correlation with the Tycho-2 and Hipparcos catalogs yielded 819 candidates (with red magnitude m_R <~12. For these brighter sources, the position and proper motion data were replaced with the more accurate Tycho/Hipparcos data. In total, there are revised proper motion measurements and coordinates for 4040 stars and revised coordinates for 4330 stars. This table was created by the HEASARC in October 2002 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/I/279">CDS Catalog I/279</a> (the 24-May-2002 version of the file catalog.dat). This is a service provided by NASA HEASARC . 2002ApJS..141..187B https://heasarc.gsfc.nasa.gov/W3Browse/all/revisedlhs.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=revisedlhs& GET text/xml 180 99999 true 237.549875 -86.49247222 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=revisedlhs GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_revisedlhs&Action=More+Options&Action=Parameter+Search&ConeAdd=1 STAR CATALOG 0.0166666666666667 Optical public revisedlhs Revised Luyten Half-Second (LHS) Catalog ra Right Ascension degree pos.eq.ra;meta.main double nullable class Browse Object Classification src.class short nullable red_mag "Red" Magnitude mag phot.mag;em.opt.R double nullable position_offset Distance between Predicted J2000.0 Position of LHS and Measurements (arcsec) arcsec pos.distance double nullable name LHS Catalog Designation meta.id char nullable comment_flags Flags Indicate Comments meta.code char nullable lhs_number LHS Catalog Number meta.id;meta.main char nullable "__z_ra_dec" System unit vector column double nullable luyten_pm_dir Original Luyten Position Angle (degree) degree pos.posAng;pos.pm double nullable dec Declination degree pos.eq.dec;meta.main double nullable luyten_dec_j2000 Original Luyten Declination (J2000, Sexagesimal) pos.eq.dec char nullable pm_tot Proper Motion (arcsec/yr) arcsec/yr pos.pm double nullable pm_dir Position Angle of Proper Motion (degree) degree pos.posAng;pos.pm double nullable blue_mag "Blue" Magnitude mag phot.mag;em.opt.B double nullable "__row" System index column char nullable poss_i_epoch POSS I Epoch yr time.start;obs double nullable luyten_ra_j2000 Original Luyten Right Ascension (J2000, Sexagesimal) pos.eq.ra char nullable luyten_pm_tot Original Luyten Proper Motion (arcsec/yr) arcsec/yr pos.pm double nullable "__x_ra_dec" System unit vector column double nullable bii Galactic Latitude degree pos.galactic.lat double nullable poss_ii_epoch POSS II Epoch yr time.start;obs double nullable lii Galactic Longitude degree pos.galactic.lon double nullable "__y_ra_dec" System unit vector column double nullable alt_name Tycho-2 or Hipparcos Identification meta.id char nullable