K2 Targets Data Column Definitions
The following table lists all of the data columns in the K2
Targets table (k2targets) that can be returned through
the Exoplanet Archive's application programming
interface (API), or when using the interactive
table.
More information on Exoplanet Archive K2 support can be found on the K2 resources page.
Some data include more specific information that can also be retrieved as separate calls in the API. These include:
- Uncertainties (positive and negative)
- String Display columns
Data from parameters listed in the Stellar Columns come from Huber et al. 2016.
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Identification Information
| Database Column Name |
Table Label | Description | Uncertainties Column |
Displayed String Name |
|---|---|---|---|---|
| epic_number† | EPIC number | Identification number from the EPIC (Ecliptic Plane Input Catalog) | ||
| tm_name† | 2MASS Designation | The name of the object as it appears in the 2MASS Catalog | ||
| k2_campaign† | K2 Campaign number | The K2 Campaign number for this target | ||
| k2_type† | K2 Object Type | The K2 Object Type for this target: Star or Extended | ||
| rastr† | RA (sexagesimal) | Right Ascension of the planetary system in sexagesimal format | ||
| decstr† | Dec (sexagesimal) | Declination of the planetary system in sexagesimal notation | ||
| ra | RA (decimal degrees) | Right Ascension of the planetary system in decimal degrees | raerr | |
| dec | Dec (decimal degrees) | Declination of the planetary system in decimal degrees | decerr | |
| k2_glon | Galactic Longitude (deg) | Galactic longitude of the planetary system in units of decimal degrees | ||
| k2_glat | Galactic Latitude (deg) | Galactic latitude of the planetary system in units of decimal degrees | ||
k2_plx |
Parallax (mas) | Difference in the angular position of a star as measured at two opposite positions within the Earth's orbit | (+) k2_plxerr1 (-) k2_plxerr2 |
k2_plxstr |
| k2_pmra | RA Proper Motion (mas/yr) | Angular change in right ascension over time as seen from the center of mass of the Solar System | (+) k2_pmraerr1 (-) k2_pmraerr2 |
k2_pmrastr |
| k2_pmdec | Dec Proper Motion (mas/yr) | Angular change in declination over time as seen from the center of mass of the Solar System | (+) k2_pmdecerr1 (-) k2_pmdecerr2 |
k2_pmdecstr |
| k2_propid† | K2 Proposal Identifiers | List of K2 proposal identifiers, separated by a semi-colon | ||
| k2_npropid | Number of K2 Proposal Identifiers | Number of K2 proposal identifiers associated with the EPIC number | ||
| k2_lcflag | Long cadence flag | Flag indicating if the target was observed using long cadence | ||
| k2_scflag | Short cadence flag | Flag indicating if the target was observed using short cadence |
† Default column: these columns display in the interactive table when the table is first loaded, and when Reset Filters is clicked.
NOTE: For the K2 Names and K2 Targets tables, the Two-Wheel Engineering Test data are designated as Campaign E. To enable sorting, this Campaign is displayed as E, but the interactive table sorting and filtering defines the Campaign as -1.
Here are a few tips on searching this field (see the user guide for general help on sorting and filtering interactive tables):
For interactive tables:
- When using the using the arrows at the top of the columns, sorting will list the campaigns in temporal order (E,0,1, etc).
- To see only the engineering campaign, enter -1 in the text box.
- To see only Campaign 1, enter '1' in the text box. Use single quotes in your entered string.
- To see Campaigns E,0 and 1, enter <2 in the text box.
For the API:
- Add
&order=k2_campaignto sort by campaings in temporal order (E,0,1, etc). - To select only the engineering campaign,
add &where=k2_campaign=-1or&where=k2_campaign_str='E' - To see Campaigns E,0 and 1, enter
add &where=k2_campaign<2
Stellar Columns
| Database Column Name |
Table Label | Description | Uncertainties Column |
Displayed String Name |
|---|---|---|---|---|
| k2_ebmv | E(B-V) [mag] | Stellar E(B-V) Reddening | (+) k2_ebmverr1 (-) k2_ebmverr2 |
k2_ebmvstr |
| k2_dist† | Distance (pc) | Distance to the star in units of parsecs | (+) k2_disterr1 (-) k2_disterr2 |
k2_diststr |
| k2_teff† | Effective Temperature (K) |
Temperature of the star as modeled by a black body emitting the same total amount of electromagnetic radiation. |
(+) k2_tefferr1 (-) k2_tefferr2 |
k2_teffstr |
| k2_logg | Stellar Surface Gravity [log10 (cm/s**2)] | Gravitational acceleration experienced at the stellar surface. | (+) k2_loggerr1 (-) k2_loggerr2 |
k2_loggstr |
| k2_metfe | Stellar Metallicity [dex] | Measurement of the metal content of the photosphere of the star as compared to the hydrogen content. | (+) k2_metfeerr1 (-) k2_metfeerr2 |
k2_metfestr |
| k2_rad† | Stellar Radius [Solar radii] | Length of a line segment from the center of the star to its surface, measured in units of radius of the Sun. | (+) k2_raderr1 (-) k2_raderr2 |
k2_radstr |
| k2_mass† | Stellar Mass [Solar mass] | Amount of matter contained in the star, measured in units of masses of the Sun. | (+) k2_masserr1 (-) k2_masserr2 |
k2_massstr |
| k2_dens | Stellar Density [glem**3] | Amount of mass per unit of volume of the star. | (+) k2_denserr1 (-) k2_denserr2 |
k2_densstr |
| k2_star_prov | Provenance of Stellar Parameters |
Flag indicating which observables were used to derive the classification. hip: Hipparcos parallax and colors apo: APOGEE spectroscopic classification rav: RAVE spectroscopic classification lam: LAMOST spectroscopic classification rpm: reduced proper motions and colors col: colors only |
||
| k2_star_reflink | Link to Stellar Columns Reference |
Photometry Columns
| Database Column Name |
Table Label | Description | Uncertainties Column | Displayed String Name |
|---|---|---|---|---|
| k2_kepmag† | Kepler-band [mag] | Brightness of the host star in the Kepler-band in units of magnitudes | k2_kepmagerr | st_kepmagstr |
| k2_kepmagflag† | Kepler-band magnitude flag | Origin of the derived Kepler-band magnitude: gri, BV, JHK, J | ||
| k2_bjmag | B-band (Johnson) [mag] | Brightness of the host star as measured using the B (Johnson) band in units of magnitudes | k2_bjmagerr | k2_bjmagstr |
| k2_vjmag† | V-band (Johnson) [mag] | Brightness of the host star as measured using the V (Johnson) band in units of magnitudes | k2_vjmagerr | st_vjmagstr |
| k2_umag | u-band (Sloan) [mag] | Brightness of the host star as measured using the u (Sloan) band in units of magnitudes | k2_umagerr | k2_umagstr |
| k2_gmag | g-band (Sloan) [mag] | Brightness of the host star as measured using the g (Sloan) band in units of magnitudes | k2_gmagerr | k2_gmagstr |
| k2_rmag | r-band (Sloan) [mag] | Brightness of the host star as measured using the r (Sloan) band in units of magnitudes | k2_rmagerr | k2_rmagstr |
| k2_imag | i-band (Sloan) [mag] | Brightness of the host star as measured using the i (Sloan) band in units of magnitudes | k2_imagerr | k2_imagstr |
| k2_zmag | z-band (Sloan) [mag] | Brightness of the host star as measured using the z (Sloan) band in units of magnitudes | k2_zmagerr | k2_zmagstr |
| k2_jmag | J-band (2MASS) [mag] | Brightness of the host star as measured using the J (2MASS) band in units of magnitudes | k2_jmagerr | k2_jmagstr |
| k2_hmag | H-band (2MASS) [mag] | Brightness of the host star as measured using the H (2MASS) band in units of magnitudes | k2_hmagerr | k2_hmagstr |
| k2_kmag† | Ks-band (2MASS) [mag] | Brightness of the host star as measured using the K (2MASS) band in units of magnitudes | k2_kmagerr | k2_kmagstr |
| k2_w1mag | WISE 3.4um [mag] | Brightness of the host star as measured using the 3.4um (WISE) band in units of magnitudes | k2_w1magerr | k2_w1magstr |
| k2_w2mag | WISE 4.6um [mag] | Brightness of the host star as measured using the 4.6um (WISE) band in units of magnitudes | k2_w2magerr | k2_w2magstr |
| k2_w3mag | WISE 12.um [mag] | Brightness of the host star as measured using the 12.um (WISE) band in units of magnitudes | k2_w3magerr | k2_w3magstr |
| k2_w4mag | WISE 22.um [mag] | Brightness of the host star as measured using the 22.um (WISE) band in units of magnitudes | k2_w4magerr | k2_w4magstr |
Last updated: 2 November 2021
