14.2.1 sso_observation

Solar System object observations. Each table line contained data obtained during the transit of the source on a single CCD, during a single transit. The corresponding epoch is provided. Data not varying within the transit are repeated identically for all single observations of that transit.

Columns description:

solution_id : Solution Identifier (long)

All Gaia data processed by the Data Processing and Analysis Consortium comes tagged with a solution identifier. This is a numeric field attached to each table row that can be used to unequivocally identify the version of all the subsystems that where used in the generation of the data as well as the input data used. It is mainly for internal DPAC use but is included in the published data releases to enable end users to examine the provenance of processed data products. To decode a given solution ID visit https://gaia.esac.esa.int/decoder/solnDecoder.jsp

source_id : Source identifier (long)

A unique single numerical identifier of the source obtained from gaia_source (for a detailed description see gaia_source.source_id). Note in particular that these identifiers are by convention negative for SSOs.

observation_id : Observation Identifier (long)

Identifier at single CCD level of the observation of a Solar System object. It is unique, and obtained from a combination of transit_id and an integer number representing the CCD strip.

number_mp : minor planet number attributed by MPC (long)

Minor Planet number attributed by MPC

epoch : Gaia-centric epoch TCB(Gaia) (double, Time[Barycentric JD in TCB - 2455197.5 (day)])

Gaia-centric epoch TCB(Gaia) in JD corresponding to the time of crossing of the fiducial line of the CCD. This is the epoch to which the target coordinates and the position/velocity of Gaia are referred. To avoid loss of precision the reference time J2010.0 has been subtracted.

epoch_err : Error in Gaiacentric epoch (double, Time[day])

The error in the Gaiacentric epoch (for both epoch and epoch_utc).

epoch_utc : Gaiacentric epoch UTC (double, Time[Julian Date (day)])

Gaiacentric epoch in UTC in JD-2455197.5 corresponding to right ascension and declination.

ra : Right ascension of the source (double, Angle[deg])

ICRS Right Ascension of the source as observed by Gaia at epoch.

dec : Declination of the source (double, Angle[deg])

ICRS Declination of the source as observed by Gaia at epoch

ra_error_systematic : Standard error of right ascension - systematic (double, Angle[mas])

Uncertainty on right ascension, systhematic component, multiplied by cos of declination.

dec_error_systematic : Standard error of declination - systematic (double, Angle[mas])

Standard error for declination, systhematic component.

ra_dec_correlation_systematic : Correlation of ra and dec errors - systematic (double)

Correlation of Ra and Dec errors, systhematic component.

ra_error_random : Standard error of right ascension - random (double, Angle[mas])

Uncertainty on right ascension, random component, multiplied by cos of declination.

dec_error_random : Standard error of declination - random (double, Angle[mas])

Standard error for declination, random component.

ra_dec_correlation_random : Correlation of ra and dec errors - random (double)

Correlation of Ra and Dec errors, random component.

g_mag : Calibrated G mag (double, Magnitude[mag] )

Corrected G magnitude based on refined signal analysis. Produced by the same photometric calibration performed for stars.

g_flux : Average calibrated G flux for the transit (double, Flux[e-/s])

Average calibrated G flux for the transit.

g_flux_error : Error on the G flux (double, Flux[e-/s])

Error on the average transit-level G flux derived in the Photometric Pipeline from the individual CCD-level flux measurements of the single transit.

x_gaia : Barycentric x position of Gaia (double, Length & Distance[AU] )

Barycentric equatorial J2000 (ICRS) x position of Gaia at the epoch of observation.

y_gaia : Barycentric y position of Gaia (double, Length & Distance[AU] )

Barycentric equatorial J2000 (ICRS) y position of Gaia at the epoch of observation.

z_gaia : Barycentric z position of Gaia (double, Length & Distance[AU] )

Barycentric equatorial J2000 (ICRS) z position of Gaia at the epoch of observation.

vx_gaia : Barycentric x velocity of Gaia (double, Velocity[au/d] )

Barycentric equatorial J2000 (ICRS) x velocity of Gaia at the epoch of observation.

vy_gaia : Barycentric y velocity of Gaia (double, Velocity[au/d] )

Barycentric equatorial J2000 (ICRS) y velocity of Gaia at the epoch of observation.

vz_gaia : Barycentric z velocity of Gaia (double, Velocity[au/d] )

Barycentric equatorial J2000 (ICRS) z velocity of Gaia at the epoch of observation.

position_angle_scan : Position angle of the scanning direction (double, Angle[deg])

Position angle of the scan direction at the epoch of observation in the equatorial reference frame. 0 = North direction, pi/2 = increasing right ascension, pi = South, 3pi/2 = decreasing right ascension. It is defined as the angle between the AL direction and the direction to the North Pole, at the SSO position, after applying the correction for aberration. As a consequence of this correction for aberration, the AC direction is no longer strictly perpendicular to the AL direction.

level_of_confidence : Level of confidence of the identification (short, Dimensionless[percentage/100])

Level of confidence in the identification of the given SSO source_id with this observation: 0 stands for completely unambiguous identification, 100 stands for failed identification.