IV/34 K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)
K2 Ecliptic Plane Input Catalog (EPIC) Huber D., Bryson S.T. et al. <Publ. Astron. Soc. Pac., 126, 398-408 (2014)> =2017yCat.4034....0H =2014PASP..126..398H
ADC_Keywords: Photometry, UBVRI ; Photometry, infrared ; Cross identifications ; Proper motions ; Stars, masses ; Stars, distances ; Surveys Keywords: catalogs; planetary systems; proper motions; stars: fundamental parameters; stars: late-type; techniques: photometric Abstract: The K2 Mission (Howell+, 2014PASP..126..398H) uses the Kepler spacecraft to obtain high-precision photometry over ∼80 day campaigns in the ecliptic plane. The Ecliptic Plane Input Catalog (EPIC) provides coordinates, photometry, and kinematics based on a federation of all-sky catalogs to support target selection and target management for the K2 mission. Description: The construction of the EPIC, as well as modifications and shortcomings of the catalog are described in Huber+, 2016, J/ApJS/224/2 Changes for Campaigns 0-3, 7-10 and 16 are described in: http://archive.stsci.edu/k2/manuals/epic.pdf Kepler magnitudes (Kp) are shown to be accurate to ∼0.1mag for the Kepler field, and the EPIC is typically complete to Kp∼17 (Kp∼19 for campaigns covered by Sloan Digital Sky Survey). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file epic.sam 528 1000 *The K2 EPIC catalog
Note on epic.sam : A subset of 1000 sources is given in "epic.sam". The full catalog (August 2017) includes 59,458,228 sources.
See also: I/322 : UCAC4 Catalogue (Zacharias+, 2012) V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012) I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) I/297 : NOMAD Catalog (Zacharias+ 2005) I/259 : The Tycho-2 Catalogue (Hog+ 2000) J/ApJS/224/2 : K2 EPIC stellar properties for 138600 targets (Huber+, 2016) http://archive.stsci.edu/k2/catalogs.html : MAST K2 catalogs home page http://keplerscience.arc.nasa.gov/ : Kepler & K2 Science Center Byte-by-byte Description of file: epic.sam
Bytes Format Units Label Explanations
1- 9 I9 --- ID [201000001/251809144] K2 Input Catalog ID 11- 20 F10.6 deg RAdeg Right Ascension (J2000) (k2_ra) 22- 31 F10.6 deg DEdeg Declination (J2000) (k2_dec) 33- 38 I6 --- HIP ? Hipparcos identifier 40- 50 A11 --- TYC ? Tycho2 identifier 52- 61 A10 --- UCAC4 ? UCAC4 identifier (ucac) 63- 79 A17 --- 2MASS ? 2MASS identifier (HHMMSSss+DDMMSSs; J2000) (twomass) 81-100 A20 --- SDSS ? SDSS-ID DR9 identifier (run, rerun (301), camcol (1-6), field (11-1001) and object (1-16000)) 102-109 A8 --- OType ? Object type ("STAR" (57,481,182 occurrences) or "EXTENDED" (1,953,153 occurrences)) (objtype) 111-113 A3 --- Kpflag ? Kepler magnitude flag (kepflag) (1) 115-118 A4 --- Sflag ? Stellar properties flag [not used] (stpropflag) (2) 120-128 F9.3 mas/yr pmRA [-3842/2482]? Proper motion in RA 130-136 F7.3 mas/yr e_pmRA [0/998]? Uncertainty in proper motion in RA 138-146 F9.3 mas/yr pmDEC [-3544/2318]? Proper motion in DEC 148-154 F7.3 mas/yr e_pmDEC [0/1000]? Uncertainty in proper motion in DEC 156-162 F7.3 mas plx [-100/337]? Hipparcos parallax 164-169 F6.3 mas e_plx [0.1/72]? Uncertainty in parallax 171-176 F6.3 mag Bmag [0.8/19]? Johnson B magnitude (3) 178-182 F5.3 mag e_Bmag [0.01/2]? Uncertainty in Johnson B magnitude 184-189 F6.3 mag Vmag [1/19]? Johnson V magnitude (3) 191-195 F5.3 mag e_Vmag [0.009/1.2]? Uncertainty in Johnson V magnitude 197-202 F6.3 mag umag [11/33]? SDSS u magnitude 204-208 F5.3 mag e_umag [0.001/10]? Uncertainty in Sloan u magnitude 210-215 F6.3 mag gmag [7.9/34]? SDSS g magnitude 217-221 F5.3 mag e_gmag [0.001/0.9]? Uncertainty in Sloan g magnitude 223-228 F6.3 mag rmag [6.9/20]? SDSS r magnitude 230-234 F5.3 mag e_rmag [0.001/0.9]? Uncertainty in Sloan r magnitude 236-241 F6.3 mag imag [5.7/35.2]? SDSS i magnitude 243-247 F5.3 mag e_imag [0.001/0.9]? Uncertainty in Sloan i magnitude 249-254 F6.3 mag zmag [10.4/36.7]? SDSS z magnitude 256-260 F5.3 mag e_zmag [0.001/10]? Uncertainty in Sloan z magnitude 262-267 F6.3 mag Jmag [3.5/17.6]? 2MASS J magnitude 269-273 F5.3 mag e_Jmag [0.01/0.3]? Uncertainty in 2MASS J magnitude 275-280 F6.3 mag Hmag [2.4/17]? 2MASS H magnitude 282-286 F5.3 mag e_Hmag [0.01/0.3]? Uncertainty in 2MASS H magnitude 288-293 F6.3 mag Ksmag [1.9/16.1]? 2MASS Ks Magnitude 295-299 F5.3 mag e_Ksmag [0.01/0.3]? Uncertainty in 2MASS Ks magnitude 301-306 F6.3 mag Kpmag [0.7/33.3] Kepler magnitude (kp) 308-312 I5 K Teff [1708/33037]?=0 Effective temperature 314-318 I5 K E_Teff [17/28181]?=0 Upper uncertainty in Teff 320-324 I5 K e_Teff [17/28181]?=0 Lower uncertainty in Teff 326-331 F6.3 [cm/s2] logg [-0.9/5.4]? log surface gravity 333-337 F5.3 [cm/s2] E_logg [0.02/5]? Upper uncertainty in logg 339-343 F5.3 [cm/s2] e_logg [0.02/5.3]? Lower uncertainty in logg 345-350 F6.3 [-] [Fe/H] [-3.5/1]? Metallicity (feh) 352-356 F5.3 [-] E_[Fe/H] [0.05/3]? Upper uncertainty in metallicity 358-362 F5.3 [-] e_[Fe/H] [0.05/3]? Lower uncertainty in metallicity 364-370 F7.3 Rsun Rad [0.08/542]? Stellar radius 372-378 F7.3 Rsun E_Rad [0.002/317]? Upper uncertainty in stellar radius 380-386 F7.3 Rsun e_Rad [0.002/400]? Lower uncertainty in stellar radius 388-393 F6.3 Msun Mass [0.07/40]? Stellar mass 395-400 F6.3 Msun E_Mass [0.001/28]? Upper uncertainty in stellar mass 402-407 F6.3 Msun e_Mass [0.001/21]? Lower uncertainty in stellar mass 409-415 F7.3 Sun rho [0/103]? Stellar density (solar units) 417-422 F6.3 Sun E_rho [0/76]? Upper uncertainty in stellar density 424-430 F7.3 Sun e_rho [0/114]? Lower uncertainty in stellar density 432-440 F9.1 pc Dist [3/1716000]? Stellar distance (d) 442-453 F12.1 pc E_Dist [0.1/]? Upper uncertainty in stellar distance 455-466 F12.1 pc e_Dist [0.1/]? Lower uncertainty in stellar distance 468-473 F6.3 mag E(B-V) [0/14]? Extinction (ebv) 475-479 F5.3 mag E_E(B-V) [0/3.7]? Upper uncertainty in extinction 481-485 F5.3 mag e_E(B-V) [0/4.4]? Lower uncertainty in extinction 487-498 A12 --- NOMAD1 ? NOMAD1 identifier (for sources with supplemented NOMAD1 proper motions) 500-518 A19 --- f_2MASS ? 2MASS flags (Qflg-Rflg-Bflg-Cflg-Xflg-Aflg; see II/246) (mflg) 520-526 F7.3 arcsec Prox [0.1/258]? 2MASS nearest neighbor distance 528 I1 --- Kflag [0/1] 1=target was observed, 0=target not observed (k2availflag)
Note (1): The EPIC identifier "KepFlag" keeps track of which photometry was used to calculate the Kepler magnitude. The prioritization was adopted as follows: gri = Kp was calculated from gri magnitudes using Equations (2)-(5) in Brown+ (2011, J/AJ/142/112). BV = Sloan gr was estimated from Johnson BV using the transformations by Bilir+ (2005, J/AN/326/321): Equation (1): g-r=1.124(B-V)-0.252 and Equation (2): g=V+0.634(B-V)-0.108 Kp was then calculated from gr using Equation (2) in Brown+ (2011, J/AJ/142/112). JHK = Kp was calculated using the polynomial J-K relations by Howell+ (2012ApJ...746..123H). Given x=J-K these transformations are: Equation (3): Kp=0.42443603+3.7937617x-2.3267277x2 +1.4602553x3+K, for all stars with J-H>0.75 and H-K>0.1 (approximate color cut for giants), and Equation (4): Kp=0.314377+3.85667x+3.176111x2 -25.3126x3+40.7221x4 -19.2112x5+K, for all remaining stars. The above relations are applied for -0.2<J-K<1.2 for giants and -0.2<J-K<1.0 for dwarfs, which are the calibration ranges given by Howell+ (2012ApJ...746..123H). J = For sources outside the color limits of Equations (3) and (4) or sources which only have a valid J-band magnitude, a rough estimate of Kp was calculated from the J-band magnitude using the relations by Howell+ (2012ApJ...746..123H): Equation (5):-398.04666+149.08127J-21.952130J2 +1.5968619J3-0.057478947J4 +0.00082033223J5+J for J=10-16.7 and Equation (6): Kp=0.1918+1.08156J for J>16.7. See section 3 in Huber+, 2016, J/ApJS/224/2, for a further discussion. Note (2): Flags indicate which observables were used to derive the classification as follows: hip = Hipparcos parallax + colors; apo = APOGEE spectroscopic classification; rav = RAVE spectroscopic classification; lam = LAMOST spectroscopic classification; rpm = reduced proper motions + colors; col = colors only Note (3): For sources with photometry in multiple catalogs, Tycho BV and UCAC gri were prioritized over APASS BV and SDSS gri to avoid saturation problems for bright stars.
History: Downloaded from http://archive.stsci.edu/k2/catalogs.html (August 2017)
(End) F.-X. Pineau, E. Perret [CDS] 14-Sep-2017
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