Table information for 'fk6.fk6join'

General

Table Description: The union of all published parts of FK6, comprising only the common fields.

This table is available for ADQL queries and through the TAP endpoint.

Resource Description: Parts I and III of the sixth fundamental catalog, a catalog of high-precision astrometry for bright stars combining centuries of ground-based observations as reflected in FK5 with HIPPARCOS astrometry. The result contains, in particular for the proper motions, statistically significant improvements of the Hipparcos data und represents a system of unprecedented accuracy for these 4150 fundamental stars. The typical mean error in pm is 0.35 mas/year for 878 basic stars, and 0.59 mas/year for the sample of the 3272 additional stars.

For a list of all services and tables belonging to this table's resource, see Information on resource 'The Sixth Fundamental Catalogue (FK6)'

Resource Reference URL: ARI FK6 pages

Citing this table

To cite the table as such, we suggest the following BibTeX entry:

@MISC{vo:fk6_fk6join,
  year=2008,
  title={The Sixth Fundamental Catalogue (FK6)},
  author={{GAVO} Data Centre},
  url={https://dc.zah.uni-heidelberg.de/tableinfo/fk6.fk6join},
  howpublished={{VO} resource provided by the {GAVO} Data Center}
}

Resource Documentation

Input

The FK5 consists of observations coming from the past 200 years. Three parts were published giving the results of that work: First we have the Basic FK5 with 1535 stars, second the FK5 Extension with 3117 objects , and third the FK5 Supplement with 995 objects.

The results from the HIPPARCOS mission were published in 1997 (The Hipparcos and Tycho Catalogues).

The catalogue

The combination of the Hipparcos data and the FK5 was primarily done using only probable single stars. Two parts were published:

In FK6 part I (published 1999) 878 single stars (or objects that could be treated as single) were used from the Basic FK5, in FK6 part III (published 2000) 3272 single stars (or objects that could be treated as single) from the FK5 Extension and the FK5 Supplement were added.

The FK6 catalogue gives three solutions for each star: Besides the standard model for single stars, in which these were treated with a constant space velocitiy (single star mode, "SI"), two further solutions were added. The data of the standard single star mode "SI" are valid for real single stars only. For all other samples of stars it is, however, necessary to include the statistically significant influence of stars with companions in the solutions. The principles of this statistical astrometry were described by 1997A&A...325..367W and are also given in the printed FK6 catalogues.

The uncertain knowledge of the included correlations allows merely to produce two approximate solutions for short-period predictions of the position (short term prediction, "STP") or predictions for longer terms (long term predictions, "LTP"). The data of the STP mode should be used for epochs near to 1991.25, the mean observational epoch of Hipparcos, the data from the LTP mode for epochs differing from this mean epoch by more than 10-20 years.

Note that part II of the catalog (containing binary stars with orbits) was never published. See 2000A&A...360..399W for an orbit of Polaris.

Abbreviations used in the notes for the objects

af:
binarity is assumed optical since objects are approximately fixed
nc:
binarity is assumed optical since objects show no common proper motion
hv
binarity is assumed optical since objects have a high relative velocity
pc
binarity is assumed optical since objects have large spatial separation
no
no relative position given
oo
only one observation given in CCDM or WDS (hence no relative proper motion available)

Columns

Sorted by DB column index. [Sort alphabetically]

NameTable Head DescriptionUnitUCD
localid Identifier FK6 number of the star (it is identical with its FK5 or FK4sup number) N/A meta.id;meta.main
hipno HIP# Number of the star in the HIPPARCOS Catalogue (ESA 1997) N/A meta.id
comname Name Common Name N/A meta.id
raj2000 RA The right ascension alpha of the star at epoch and equinox J2000.0 in the ICRS/HIPPARCOS system for the SI mode of the FK6. deg pos.eq.ra;meta.main
dej2000 Dec The declination delta of the star at epoch and equinox J2000.0 in the ICRS/HIPPARCOS system for the SI mode of the FK6. deg pos.eq.dec;meta.main
pmra PM α The proper-motion component of the star in alpha at epoch and equinox J2000.0 in the ICRS/HIPPARCOS system for the SI mode of the FK6, cos(delta) applied. deg/yr pos.pm;pos.eq.ra;meta.main
pmde PM δ The proper-motion component mu_delta of the star in delta at epoch and equinox J2000.0 in the ICRS/HIPPARCOS system for the SI mode of the FK6. deg/yr pos.pm;pos.eq.dec;meta.main
epra Ep(RA) Central epoch of raj2000 in the SI mode. yr time.epoch;pos.eq.ra
e_raj2000 Err(RA) Mean error of raj2000 in the SI mode, cos(delta) applied. deg stat.error;pos.eq.ra;meta.main
e_pmra Err(PM RA) Mean error of pmra in the SI mode. deg/yr stat.error;pos.pm;pos.eq.ra;meta.main
epde Ep(Dec) Central epoch of delta in the SI mode. yr time.epoch;pos.eq.dec
e_dej2000 Err(Dec) Mean error of dej2000 at the central epoch epde deg stat.error;pos.eq.ra;meta.main
e_pmde Err(PM Dec) Mean error of pmde in the SI mode. deg/yr stat.error;pos.pm;pos.eq.dec;meta.main
pres Parallax 'Resulting' parallax p_res of the star. This is either the HIPPARCOS parallax or a photometric/spectroscopic parallax. deg pos.parallax
e_pres Err.(Par.) Mean error of parallax deg stat.error;pos.parallax
src_par Src(Par.) Source of parallax (H=HIPPARCOS, P=Newly determined photometric or spectroscopic parallax) N/A meta.code;pos.parallax
v_rad v_rad Radial velocity km/s spect.dopplerVeloc;pos.heliocentric
vmag m_V Apparent visual magnitude m_V of the star, taken from the HIPPARCOS Catalogue mag phot.mag;em.opt.V
varFlag Var? Flag for the variability of the brightness of the star, taken from the HIPPARCOS Catalogue (see note) [Note V] N/A meta.code;src.var
K_bin Binarity Flag for the double-star nature of the object (see note) [Note M] N/A meta.code.multip
K_Delta_mu Dmu Flag for the double-star nature of the object based on differences between various proper motions (see note) [Note D] N/A meta.code.multip
K_ae Excellent? Flag for astrometrically excellent stars, larger numbers are better (3 is best) N/A meta.code.qual
sect FK6 part FK6 part of this record N/A meta.id.part;meta.main
note Note Note for this object N/A meta.note
pmraSTP PM RA (STP) Proper motion in RA, cos(delta) applied, in STP mode deg/yr pos.pm;pos.eq.ra
pmdeSTP PM Dec (STP) Proper motion in Dec in STP mode deg/yr pos.pm;pos.eq.dec
e_pmraSTP Err. PM RA (STP) Mean error in PM(RA)*cos(delta) in STP mode deg/yr stat.error;pos.pm;pos.eq.ra
e_pmdeSTP Err. PM Dec (STP) Mean error in PM(Dec) in STP mode deg/yr stat.error;pos.pm;pos.eq.dec
pmraLTP PM RA (LTP) Proper motion in RA, cos(delta) applied, in LTP mode deg/yr pos.pm;pos.eq.ra
pmdeLTP PM Dec (LTP) Proper motion in Dec in LTP mode deg/yr pos.pm;pos.eq.dec
e_pmraLTP Err. PM RA (LTP) Mean error in PM(RA)*cos(delta) in LTP mode deg/yr stat.error;pos.pm;pos.eq.ra
e_pmdeLTP Err. PM Dec (LTP) Mean error in PM(Dec) in LTP mode deg/yr stat.error;pos.pm;pos.eq.dec
pmraHIP PM RA (HIP) Proper motion in RA, cos(delta) applied, in HIP mode deg/yr pos.pm;pos.eq.ra
pmdeHIP PM Dec (HIP) Proper motion in Dec in HIP mode deg/yr pos.pm;pos.eq.dec
e_pmraHIP Err. PM RA (HIP) Mean error in PM(RA)*cos(delta) in HIP mode deg/yr stat.error;pos.pm;pos.eq.ra
e_pmdeHIP Err. PM Dec (HIP) Mean error in PM(Dec) in HIP mode deg/yr stat.error;pos.pm;pos.eq.dec

Columns that are parts of indices are marked like this.

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