Information on Service 'The Henry Draper Catalog with Gaia IDs'

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This is the Henry Draper catalog (HD, Cannon & Pickering 1918-1924) as distributed by the Astronomical Data Center in 1989 (Vizier III/135A), with Gaia DR2 source_ids and positions added. The link to modern Gaia DR2 was done through Fabricius et al's match between HD and Tycho 2 (Vizier IV/25), TGAS to match Tycho 2 and Gaia DR1, and Gaia DR2 to match against Gaia DR1.

For a list of all services and tables belonging to this service's resource, see Information on resource 'The Henry Draper Catalog with Gaia IDs'

Service Documentation

This resource grew out of the realisation just how hard it is to do useful things with HD numbers in the VO. In provides the original Henry Draper catalog together with Gaia DR2 source ids for the stars identified in Fabricius et al's Tycho 2-HD match (2002A&A...386..709F)

It was generated as follows (cf. sources):

  1. create a database table for the HD catalog with empty columns for the Gaia counterparts. While doing this, precess the B1900 positions to J2000. We haven't bothered with diffrences in the reference catalogs; at the 1 arcminute precision of the HD, this doesn't matter at all. All astrometry coming from HD is for debugging only.

  2. Get a mapping from HD numbers to standard Tycho-2 ids from VizieR:

    select HD, n_HD, n_TYC,
      TYC1 || '-' || TYC2 || '-' || TYC3 as tycho_id
    from "IV/25/tyc2_hd"
    
  3. Turn the Tycho 2 identifier to a Gaia DR2 source_id using the dr2_tycho_best_neighbour table. It does not exist on VizieR, so we used the ARI-Gaia service:

    select hd, n_hd, n_tyc, source_id
    from gaiadr2.tycho2_best_neighbour
    join TAP_UPLOAD.tyc
    on (tycho_id=original_ext_source_id)
    

    After this procedure, HD 45900, HD 260686, and HD 121169 did not have unique matches. It seemed excessive to complicate the data model just for these three objects. We have randomly dropped one possible match for each of them; in addition, HD 121169 should have had an second match, which did not work out in Gaia DR2. These doubtful cases can be identified by n_TYC=2.

  4. Complete the source_id, gaia_ra, gaia_dec, n_hd, and n_tyc columns of the table created in step (a) with the data obtained in step (c) and a local DR2 table.

Overview

You can access this service using:

This service is published as follows:

local means it is listed on our front page, ivo_managed means it has a record in the VO registry.

Spatial Coverage

Input Fields

The following fields are available to provide input to the service (with some renderers, some of these fields may be unavailable):

NameTable Head DescriptionUnitUCD
DEC Delta (ICRS) Declination (ICRS decimal) deg pos.eq.dec
hd Hd HD number for this object N/A meta.id;meta.main
hscs_pos Position/Name Coordinates (as h m s, d m s or decimal degrees), or SIMBAD-resolvable object N/A N/A
hscs_sr Search radius Search radius in arcminutes N/A N/A
m_v m_V Photovisual magnitude or the star, except for magnitudes >= 20, which are object type flags (see note). mag phot.mag;em.opt.V
MAXREC Match limit Maximum number of records returned. Pass 0 to retrieve service parameters. N/A N/A
RA Alpha (ICRS) Right Ascension (ICRS decimal) deg pos.eq.ra
RESPONSEFORMAT Output Format File format requested for output. N/A meta.code.mime
spectral Spectral Spectral type, given in upper and lower case as in the published catalog. N/A src.sptype
SR Search Radius Search radius deg N/A
VERB Verbosity Exhaustiveness of column selection. VERB=1 only returns the most important columns, VERB=2 selects the columns deemed useful to the average user, VERB=3 returns a table with all available columns. N/A N/A

Default Output Fields

The following fields are contained in the output by default. More fields may be available for selection; these would be given below in the VOTable output fields.

NameTable Head DescriptionUnitUCD
_r Dist. Distance to cone center deg pos.distance
dm DM Durchmusterung identifier, taken either from the Bonner Durchmusterung (BD), Cordoba Durchmusterung (CD), or Cape Photographic Durchmusterung (CPD); stars not given in any of them are referenced by their AGK number. Note d N/A meta.id.cross
gaia_dec Dec Gaia ICRS Declination from Gaia DR2 (i.e., Epoch J2015.5) deg pos.eq.dec;meta.main
gaia_ra RA Gaia ICRS Right Ascension from Gaia DR2 (i.e., Epoch J2015.5) deg pos.eq.ra;meta.main
hd Hd HD number for this object N/A meta.id;meta.main
m_pg m_pg Photographic magnitude or the star, except for magnitudes >= 20, which are object type flags (see note). Note m mag phot.mag;em.opt.B
m_v m_V Photovisual magnitude or the star, except for magnitudes >= 20, which are object type flags (see note). Note m mag phot.mag;em.opt.V
mpg_comb Comb? C if m_pg is a combined magnitude (with a neighbouring star given in this catalogue), NULL otherwise. N/A meta.code
mv_comb Comb? C if m_v is a combined magnitude (with a neighbouring star given in this catalogue), NULL otherwise. N/A meta.code
n_hd #HD Number of HD stars matched to a Tycho 2 source by Fabricius et al, 2002A&A...386..709F. N/A meta.number
n_tyc #Tyc Number of Tycho 2 stars matched to a HD source by Fabricius et al, 2002A&A...386..709F. N/A meta.number
remarks Rem Remarks. See note for what the letters mean. Note r N/A meta.code
source_id Gaia source_id Gaia DR2 source_id matching the HD object through Fabricius' Tycho 2 match and Gaia DR2's tycho2_best_neighbour. For four ambiguous matches, a unique match was randomly chosen (see reference URL). N/A meta.id.cross
spectral Spectral Spectral type, given in upper and lower case as in the published catalog. N/A src.sptype

VOTable Output Fields

The following fields are available in VOTable output. The verbosity level is a number intended to represent the relative importance of the field on a scale of 1 to 30. The services take a VERB argument. A field is included in the output if their verbosity level is less or equal VERB*10.

NameTable Head DescriptionUnitUCD Verb. Level
hd Hd HD number for this object N/A meta.id;meta.main 1
spectral Spectral Spectral type, given in upper and lower case as in the published catalog. N/A src.sptype 1
source_id Gaia source_id Gaia DR2 source_id matching the HD object through Fabricius' Tycho 2 match and Gaia DR2's tycho2_best_neighbour. For four ambiguous matches, a unique match was randomly chosen (see reference URL). N/A meta.id.cross 1
m_v m_V Photovisual magnitude or the star, except for magnitudes >= 20, which are object type flags (see note). Note m mag phot.mag;em.opt.V 5
m_pg m_pg Photographic magnitude or the star, except for magnitudes >= 20, which are object type flags (see note). Note m mag phot.mag;em.opt.B 5
gaia_ra RA Gaia ICRS Right Ascension from Gaia DR2 (i.e., Epoch J2015.5) deg pos.eq.ra;meta.main 5
gaia_dec Dec Gaia ICRS Declination from Gaia DR2 (i.e., Epoch J2015.5) deg pos.eq.dec;meta.main 5
_r Dist. Distance to cone center deg pos.distance 10
dm DM Durchmusterung identifier, taken either from the Bonner Durchmusterung (BD), Cordoba Durchmusterung (CD), or Cape Photographic Durchmusterung (CPD); stars not given in any of them are referenced by their AGK number. Note d N/A meta.id.cross 15
mv_comb Comb? C if m_v is a combined magnitude (with a neighbouring star given in this catalogue), NULL otherwise. N/A meta.code 15
mpg_comb Comb? C if m_pg is a combined magnitude (with a neighbouring star given in this catalogue), NULL otherwise. N/A meta.code 15
remarks Rem Remarks. See note for what the letters mean. Note r N/A meta.code 15
n_hd #HD Number of HD stars matched to a Tycho 2 source by Fabricius et al, 2002A&A...386..709F. N/A meta.number 15
n_tyc #Tyc Number of Tycho 2 stars matched to a HD source by Fabricius et al, 2002A&A...386..709F. N/A meta.number 15
ra_orig Ra_orig Original right ascension for equinox J1900.0. Note that this position is only good to about an arcminute. N/A pos.eq.ra 21
dec_orig Dec_orig Original declination for equinox J1900.0. Note that this position is only good to about an arcminute. N/A pos.eq.dec 21
ra_orig_2000 Ra_orig_2000 Original right ascension for equinox J2000.0 (precession done by DC staff). Note that this position is only good to about an arcminute. N/A pos.eq.ra 21
dec_orig_2000 Dec_orig_2000 Original declination for equinox J2000.0 (precession done by DC staff). Note that this position is only good to about an arcminute. N/A pos.eq.dec 21
mv_meas m_V? '0' if the m_v is a measured value, '1' if it's a value inferred from m_pg and the spectral type. N/A meta.code 25
mpg_meas Meas? '0' if the m_pg is a measured value, '1' if it's a value inferred from m_v and the spectral type. N/A meta.code 25
pg_intensity Intensity Photographic intensity of the spectrum estimated by Annie Cannon. The faintest spectra which could be classified with certainty were assigned a value of 1, while the densest are given as 10. For stars having two intensities in the published catalog, only the first is given here. N/A meta.code.qual 25

Copyright, License, Acknowledgements

This work has made use of data from the European Space Agency (ESA) mission `Gaia `_, processed by the Gaia `Data Processing and Analysis Consortium (DPAC) `_. Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.

VOResource XML (that's something exclusively for VO nerds)

Note d

The Durchmusterung identifier includes, in place 10, a component identifier if there are two or more HD stars with the same DM number. For multiple systems included in the Washington Catalog of Visual Double Stars (WDS, Worley 1984) the same designations are given.

In place 11, there is a lower case letter identification for BD supplemental stars (Warren and Kress 1980).

Note m

The following special values photovisual magnitude indicate unusual object types:

20.0 nebula (Neb in published catalog)
30.0 variable (var. in published catalog)
40.0 nova (Nov. in published catalog)
50.0 cluster (Cl. in published catalog)
NULL no value in published catalog
Note r

The following codes are used in the remarks:

D
Entry deleted because it is a duplicate or does not refer to a real star (see Table 4)
E
Image is at edge of plate
G
Position and BD number taken directly from AGK and precessed to 1900
M
Multiple images used. Only one intensity is included (both are in the published catalog, however)
R
There is a remark for this star in the published catalog
*
Spectral type refers to a cluster, nebula or nebulous star. (Occurs in the Magellanic Cloud fields only.)