K2 Search Output Columns

This document defines the catalog entries describing the K2 Data Archive.

Clicking on entries in this column will mark the entry for retrieval. To mark all entries, click one of the buttons labelled 'Mark All','Mark public', or 'Mark Proprietary'. (Unmarking all entries can be done the same way using the appropriate button.) For missions with proprietary data, the mark button element will have a yellow background and a '@' symbol to indicate data sets not yet public.

To Retrieve:
Click the button labelled 'Submit marked data for retrieval from STDADS'. This will send all the marked data set names to the data retrieval page. Follow the directions on the displayed pages.

To Coplot:
After selecting up to 15 observations to be plotted, click on the "Plot marked spectra" button to coplot the selected observations.

The spectra that you selected will be automatically scaled to the full range of wavelengths and nearly the full range of fluxes (i.e., y axis plot scale runs from 0 (or .25 * the minimum flux for spectra with negative fluxes) to the 10th highest flux). Each spectrum is automatically assigned a color, up to a maximum of 15.

For plotting Kepler light curves, y-axis scaling is slightly different. Plots scale simply from the minimum to the maximum flux. It is also recommended that only Kepler light curves from the same target be co-plotted due to the differences in flux values.

The spectra are labelled by their dataset names, with a summary of the datasets plotted given below the plot. After inspecting the plot, you may wish to change the selection of datasets which are displayed. Use your browser "Back" button to do this.

Plot range
Adjust the minimum and maximum wavelengths (in Angstroms) and minimum and maximum fluxes (in erg /cm2/sec/A) to select the spectral region of interest and to exclude noisy data. Note Kepler light curves are in units of time and uncalibrated fluxes.

Plot dimensions
Adjust the X size and Y size in pixels to create the size of plot desired. The maximum dimensions are 850 by 640 pixels.

Redraw plot
Use this button to replot the spectra when you have changed the plot range or plot dimensions.

Column Information

Non-unique K2 ID identifying corresponding entry in EPIC or the custom aperture file. Note multiple observations can be made with the same Kepler ID. Also used in naming data files.
range: 200000811 to 202154314

Investigation ID
Investigation ID assigned by the Kepler project describing a particular GO or project observing program.
GO0001, GO0001_GO0032, etc. (Note wild cards are added automatically before and after the user-entered ID(s).)

Dataset Name
Dataset name associated with exposure in the form ktwo[k2_id]_[timestamp]-Cnn where nn is the Campaign number.

A sequential number indicating the campaign in which the exposure was made.
only 0 for now

Object type
Type of object based on EPIC values ("star" or "extended") plus target names assigned to Custom Aperture observations (e.g., extended.M35).
star, extended.M35. Most C0 targets are currently null.

Data Release
Describes the latest data release for a particular exposure.
only 1 for now

RA (J2000)
Right Ascension in decimal degrees as extracted from the ingested FITS file headers
range: 90.09 to 106.13 although values are stored in decimal degrees, valid formats for queries include: "19 28 29.65", "19h28m29s", 292.12354

Dec (J2000)
Declination in decimal degrees (from the FITS file headers of ingested files)
range: 14.13 to 28.99 stored in decimal degrees but can be queried using values such as: "+37 14 04.5", "37.23458"

Target Type
2-character Target type
Either LC (long cadence) or SC (short cadence)

Archive Class
archive class in science table used to distinguish long and short cadence light curves and target pixel files
only TKL (target pixel files) for now. Note if both a light curve and a target pixel file exist, or just a light curve file exists, the archive class will refer to the light curve.

Current number of known papers referencing this dataset.
none yet

Actual Start Time
Start time from LC_START FITS keyword (?)
example: 2014-03-12 00:33:13

Actual End Time
End time from LC_END FITS keyword
example: 2014-05-27 16:33:30

RA proper motion
range: -6.4 to 4.7 milliarcsec/yr

RA proper motion uncertainty
range: 1.7 to 1.8 mas/yr

Dec PM
Dec proper motion
range: -10.5 to -2.5 milliarcsec/yr

Dec PM Err
Dec proper motion uncertainty
range: 1.9 to 1.9 mas/yr

Hipparcos parallax(mas)
currently all null

Plx Err
Hipparcos parallax uncertainty (mas)
currently all null

U Mag
U-band magnitude accurate to 0.04 magnitude
currently all null

U Mag Err
U-band magnitude iuncertainty
currently all null

B Mag
B-band magnitude accurate to 0.04 magnitude
range: 10.77 to 11.7

B Mag Err
B-band magnitude iuncertainty
range: 0.055 to 0.191

V Mag
V-band magnitude accurate to 0.04 magnitude
range: 10.8 to 11.7

V Mag Err
V-band magnitude uncertainty
range:0.08 to 0.18

G Mag
G-band magnitude
range: 10.65 to 11.21

G Mag Err
G-band magnitude uncertainty
range: 0.03 to 0.05

R Mag
R-band magnitude
range: 10.81 to 10.95

R Mag Err
R-band magnitude uncertainty
range: 0.02 to 0.04

I Mag
I-band magnitude
range: 10.95 to 11.49

I Mag Err
I-band magnitude uncertainty
range: 0.06 to 0.48

Z Mag
Z-band magnitude accurate to 0.03 magnitude
currently all null

Z Mag Err
Z-band magnitude uncertainty
currently all null

J Mag
2MASS J-band magnitude.
range: 10.33 to 10.51

J Mag Err
2MASS J-band magnitude uncertainty.
range: 0.027 to 0.035

H Mag
2MASS H-band magnitude.
range: 10.23 to 10.52

H Mag Err
2MASS H-band magnitude uncertainty.
range: 0.034 to 0.038

K Mag
2MASS K-band magnitude.
range: 10.49 to 10.49

K Mag Err
2MASS K-band magnitude uncertainty.
range: 0.024 to 0.024

Kepler magnitude. See the EPIC manual to see how it is calculated.
range: 6.8 to 25

Kep Flag
Kepler magnitude flag describes how Kewpler magnitude is defined. See the EPIC manual for more information.
gri is only value currently

Stellar Properties Flag
null for now

Hip ID
Hipparcos catalog ID,
null for now

Tyc ID
Tycho-2 catalog ID
example: 1877-1406-1

SDSS DR9 identifier
currently all null

UCAC-4 catalog ID
example: 567-025402

2MASS catalog ID, a sexagesimal, equatorial position-based source name in the form: hhmmssss+ddmmsss[ABC...]
example: 06162816+2318506

2MASS Flag
string containing 2MASS flags.
example: AAA-222-111-000-0-0

Processing Date
Date file was ingested into archive
2014-09-03 22:20:03

The ratio of target flux to total flux in optimal aperture. This value is not to be confused with the Crowding values given on the Target Search page which give predictive values.
null for now

1.0 - the crowding value
currently all null

flux fraction
The fraction of target flux obtained in the optimal aperture averaged for the specified data. The flux fraction in any given cadence will differ from this mean value. This value is not to be confused with the Flux Fraction value given on the Target Search page which gives a predictive values.
currently all null

The RMS Combined Differential Photometric Precision (CDPP) time series calculated by the Kepler pipeline for a transit duration of length 3-hrs over a single quarter, in units of parts per million.
currently all null

RMS Combined Differential Photometric Precision (CDPP) on 6.0-hour time scales in units of parts per million.
currently all null

RMS Combined Differential Photometric Precision (CDPP) on 12-hour time scales in units of parts per million.
currently all null

Module number.
range 2 to 24

Ouput number.
range 1 to 4

Channel number.
range 1 to 84

Skygroup Number.
currently all null

Nearest Neighbor
Distance to nearest 2MASS neighbor (arcsec)
14 to 18.1

Nomad ID
string containing NOMAD-1 identifiers (for sources with supplemented NOMAD1 proper motions)
currently all null