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| Summary of the Kepler Input Catalog Format | ||||
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These notes are relevant for Version 10 of the Kepler Input Catalog.
Version Approx Date Comments
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10 12 Aug 2008 Final mags and values from SCP. Final delivery
means KEPLER_ID now frozen and can be used as
identifier. Major revision in KEPMAG algorithm.
Consensus is now to put "best possible" value
into KEPMAG. See revised CQ discussion below.
Also revised PQ value (see below) to reflect
number of parent catalog detections since this
is a metric for how reliable entry might be.
9 26 May 2008 Recompiled to incorporate latest (26 May 08)
SCP mags and values. Also includes fixed
stellar mass calculation. All mass values
in KIC8 were 1.0. Revised culling algorithm to
remove more double detections and probable
spurious entries. Revised ALTSOURCE algorithm
to retain Hipparcos and Tycho-2 values to ease
search for bright stars.
8 15 Mar 2008 Recompiled to incorporate latest (2 Mar 08)
SCP mags and values. Added ALTSOURCE==5 for
Lepine high proper motion stars and ALTSOURCE==15
for VLBA astrometric standards. Also KEPMAG
set to NULL for all non-SCP stars as per
consensus of users.
29 May 2007 Added Lepine and hooks for other catalogss
01 May 2007 Added VLBA Astrometric Reference QSO catalog
as ALTSOURCE==15
7 15 Dec 2006 Rename YBID to SCPID and revised content. New
schema, content, etc., for SCPKEY database
as per SCP Team spectroscopy, etc.
6 22 Feb 2006 Old KICID is now KEPLER_ID. No effect on content.
6 6 Jan 2006 Fixed KEPMAG for non-SCP stars
5 29 Dec 2005 Called KIC05 as per SOC/SCP ICD. Same
schema as (4). Lots more SCP data.
4 01 Apr 2005 Recalibration of photographic magnitudes.
3 17 Feb 2005 Added colors, fixed bugs, added documentation.
Should be version for Team in May 05
2 1 Feb 2005 Astronomer units instead of integers. Added
PARLX, GLONG, GLAT fields.
1 05 Jan 2005 Fixed SPD/DEC error
0 27 Dec 2004 Dec 31 2004 release as per Requirements Document
olumn DB Name Type Units Format, comments, etc. ----------------------------------------------------------------------------- 1 RA double hours Right Ascension (HH.HHHHHHH) 2 DEC double degrees Declination (sDD.DDDDDD) 3 PMRA float arcsec/year RA proper motion(sMM.MMMM) 4 PMDEC float arcsec/year Dec proper motion (sMM.MMMM) 5 UMAG float magnitudes u-band magnitude (MM.MMM) 6 GMAG float magnitudes g-band magnitude (MM.MMM) 7 RMAG float magnitudes r-band magnitude (MM.MMM) 8 IMAG float magnitudes i-band magnitude (MM.MMM) 9 ZMAG float magnitudes z-band magnitude (MM.MMM) 10 GREDMAG float magnitudes GRed band magnitude (MM.MMM) 11 D51MAG float magnitudes D51 band magnitude (MM.MMM) 12 JMAG float magnitudes 2MASS J-band magnitude (MM.MMM) 13 HMAG float magnitudes 2MASS H-band magnitude (MM.MMM) 14 KMAG float magnitudes 2MASS K-band magnitude (MM.MMM) 15 KEPMAG float magnitudes Kepler-band magnitude (MM.MMM) 16 KEPLER_ID int (none) Unique KIC catalog ID 17 TMID int (none) Unique 2MASS catalog ID 18 SCPID int (none) Unique SCP processing ID 19 ALTID int (none) ID in other catalog (see 20) 20 ALTSOURCE int (none) Source catalog for ALTID (see 19) 21 GALAXY int (none) Star/galaxy indicator 22 BLEND int (none) Isolated/blended indicator 23 VARIABLE int (none) Constant/variable indicator 24 TEFF int degrees K Effective temperature (TTTTT) 25 LOGG float cm/sec**2 LOG10 surface gravity (sL.LLL) 26 FEH float solar LOG10 Fe/H metallicity (sL.LLL) 27 EBMINUSV float magnitudes E(B-V) reddening (sM.MMM) 28 AV float magnitudes A_V extinction (M.MMM) 29 RADIUS float solar Radius (RRR.RRR) 30 CQ string (none) Source of data - see Notes 31 PQ int (none) Photometry quality indicator 32 AQ int (none) Astrophysics quality indicator 33 CATKEY int (none) Unique integer key to CATALOG DB 34 SCPKEY int (none) Unique integer key to SCP DB 35 PARALLAX float arcsec Parallax (sP.PPPP) 36 GLON float degrees Galactic longitude (DDD.DDDDDD) 37 GLAT float degrees Galactic latitude (sDD.DDDDDD) 38 PMTOTAL float arcsec/year Total proper motion (MM.MMMM) 39 GRCOLOR float magnitudes g-r color (sM.MMM) 40 JKCOLOR float magnitudes J-K color (sM.MMM) 41 GKCOLOR float magnitudes g-K color (sM.MMM)Notes: The TYPE field shows the suggested minimum precision for storage of the value. The string in the COMMENTS field shows the format of the entry in the ASCII version of the database files.
ALTSOURCE values:
Value Comments
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0 ALTID contains NULL
1 ALTID contains Hipparcos catalog ID
2 ALTID contains Tycho2 catalog ID
3 ALTID contains UCAC2 catalog ID
4 ALTID contains General Catalog of Variable Stars ID
5 Lepine proper motion catalog star. ALTID > 0 is 2MASS
id for star, < 0 is a pseudo-identifier generated
by SCP processing.
6 ALTID contains 2MASS catalog ID coming from
Astroseismology catalog.
11 ALTID contains NED catalog ID
12 ALTID contains Extended 2MASS Catalog ID
13 ALTID contains FIRST catalog ID
14 ALTID contains NVSS catalog ID
15 ALTID contains VLBA catalog ID
16 ALTID contains CHANDRA catalog ID
CQ values:
ASCII character string indicating the source of KEPMAG value.
Value Meaning
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NOCAL No calibration to optical magnitudes possible. Used
for entries from non-optical catalogs. KEPMAG field
is NULL.
2MASS Objects found only in 2MASS catalog with no optical
counterpart. KEPMAG field is NULL.
UNCAL KEPMAG copied from a single color of the parent catalog.
Because a color-based correction was not possible given
that the parent catalog entry contained only a single
color, the uncertainty in the KEPMAG value could easily
be 1.0 magnitudes or larger.
PHOTO The parent catalog contained a blue and red magnitude
obtained from photographic photometry. These values
were used to compute the KEPMAG on the basis of
sdssg = blue;
sdssr = red;
color = sdssg - sdssr;
if (color <= 0.8)
kepmag = 0.8*sdssr + 0.2*sdssg;
else
kepmag = 0.9*sdssr + 0.1*sdssg;
The internal photographic magnitudes have typical
errors of 0.2 magnitudes, and these uncertainties
in combination with the approximate nature of the
calibration suggests that these KEPMAG errors are
perhaps 0.3 magnitudes or larger.
TYBV The parent catalog is Tycho-2, and this gives B and
V magnitudes. The KEPMAG value was computed from
sdssg = 0.54*b + 0.46*v - 0.07;
sdssr = -0.44*b + 1.44*v + 0.12;
and the same transformation as above to compute KEPMAG.
The errors in KEPMAG follow those for the Tycho-2
catalog, being a few hundredths for brighter stars
and perhaps as large as a tenth for fainter ones,
with a few hundredths added in quadrature for the
uncertainty of the transformation.
SCP The SCP values for sdssg and sdssr were used to compute
KEPMAG according to the equation above. The error
for KEPMAG is larger than for the in-band colors,
and is approximately 0.03 magnitudes.
PQ values: Integer in the range (0 <= PQ <= 8) counting the number of different optical colors presented for this entry in the parent catalogs. For NOCAL and 2MASS entries, this value is 0. For all others, it is at least 1. The maximum value is 8 being the sum of USNO-B1.0 (O,E,J,F,N), UCAC-2 (R), and Tycho-2 (B,V). In general, the more colors in the parent catalog, the more likely that this star is real. Stars with low values (perhaps 3 or smaller) may not be real and should be verified by other means. AQ values: Placeholder for SCP values that have yet to be determined. Current version is value between 0-6 which is the count of non-NULL entries in TEFF, LOGG, FEH, AV, EBMINUSV, RADIUS.
Column DB Name Type Units Format, comments, etc. ----------------------------------------------------------------------------- 1 CATKEY int (none) Unique integer key to CATALOG DB 2 CATFLAG int (none) Bit flag from catalog merge 3 TYCHOID int (none) Original ID in Tycho-2 catalog 4 UCACID int (none) Original ID in UCAC catalog 5 GCVSID int (none) Original ID in GCVS catalog 6 SOURCE character (none) STAR, XTM, NED, NVSS, FIRST 7 SOURCEID int (none) ID in original catalog 8 FLUX1 int (variable) First flux in original catalog 9 FLUX2 int (variable) Second flux in original catalog 10 RAEPOCH float year Epoch of RA coordinate 11 DECEPOCH float year Epoch of Dec coordinate 12 JMAG float mag 2MASS J magnitude 13 HMAG float mag 2MASS H magnitude 14 KMAG float mag 2MASS K magnitudeNotes:
Column DB Name Type Units Format, comments, etc. ----------------------------------------------------------------------------- 1 SCPKEY int (none) Same as KIC column 34 2 SCP_FIBER_RA double hours Right Ascension (HH.HHHHHHH) 3 SCP_FIBER_DEC double degrees Declination (sDD.DDDDDD) 4 SCP_TEFF int degrees Effective temperature (TTTTT) 5 SCP_TEFF_ERR int degrees Error in SCP_TEFF (TTTTT) 6 SCP_LOGG float cm/sec**2 LOG10 surface gravity (sL.LLL) 7 SCP_LOGG_ERR float cm/sec**2 Error in SCP_LOGG (sL.LLL) 8 SCP_FEH float solar LOG10 Fe/H metallicity (sL.LLL) 9 SCP_FEH_ERR float solar Error in SCP_FEH (sL.LLL) 10 SCP_VSINI float km/sec Rot. V*SIN(incl) (kkkk.kk) 11 SCP_VSINI_ERR float km/sec Error in SCP_VSINI (kkkk.kk) 12 SCP_RV float km/sec Radial Velocity (skkkk.kk) 13 SCP_RV_ERR float km/sec Error in SC_RV (kkkk.kk) 14 SCP_CCPH float (none) Cross correlation peak (p.ppp)Notes:
Source of Astrometry (RA, DEC, PMRA, PMDEC, PARALLAX) The source of the astrometric quantities depends on which catalog (or catalogs) contain data for this star. To ensure the highest accuracy and to minimize systematic errors, the hierarchy for the choice of astrometric values is as follows
The values listed in the KIC come from the first entry in this list that contains each star. The source catalog should be consulted for a detailed discussion of astrometric accuracy. The quantities listed here are global averages. Back to the Kepler mission hompage |
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