NSS astrometric models with an acceleration solution (gaiadr3.nss_acceleration_astro)
The table has 338215 rows, 29 columns.
Description
This table contains non-single-star astrometric models for sources having a non-linear proper motion which is compatible with an acceleration solution. Several possible models are hosted within the same table and they are indicated by the field nss_solution_type
. The description of this latter lists all possible solution types considered for this release. Only a selection of parameters hosted in this table are provided here, depending on the solution. The details of those is given in the description of field bit_index
, which can also be used to extract the relevant elements of the correlation vector corr_vec
.Details about the formalism used to derive the parameters in this table are given in the on-line documentation, see Chapter cu4nss.
Attribution
If you have used Gaia data in your research, please use the following acknowledgement:
This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.
More information can be found on the credit and citation instructions page.
Columns
Name | Type | UCD | Unit | Description |
---|---|---|---|---|
solution_id | long | meta.version |
Solution Identifier |
|
source_id | long |
meta.id meta.main meta.ref |
Source Identifier |
|
nss_solution_type | char | meta.record |
NSS model adopted |
|
ra | double |
pos.eq.ra meta.main |
deg |
Right ascension |
ra_error | float |
stat.error pos.eq.ra |
mas |
Standard error of right ascension |
dec | double |
pos.eq.dec meta.main |
deg |
Declination |
dec_error | float |
stat.error pos.eq.dec |
mas |
Standard error of declination |
parallax | double | pos.parallax | mas |
Parallax |
parallax_error | float |
stat.error pos.parallax |
mas |
Standard error of parallax |
pmra | double |
pos.pm pos.eq.ra |
mas.yr**-1 |
Proper motion in right ascension direction |
pmra_error | float |
stat.error pos.pm pos.eq.ra |
mas.yr**-1 |
Standard error of proper motion in right ascension direction |
pmdec | double |
pos.pm pos.eq.dec |
mas.yr**-1 |
Proper motion in declination direction |
pmdec_error | float |
stat.error pos.pm pos.eq.dec |
mas.yr**-1 |
Standard error of proper motion in declination direction |
accel_ra | double | phys.acceleration | mas.yr**-2 |
Acceleration in RA |
accel_ra_error | float |
stat.error phys.acceleration |
mas.yr**-2 |
Standard error of Acceleration in RA |
accel_dec | double | phys.acceleration | mas.yr**-2 |
Acceleration in DEC |
accel_dec_error | float |
stat.error phys.acceleration |
mas.yr**-2 |
Standard error of Acceleration in DEC |
deriv_accel_ra | double | phys.acceleration | mas.yr**-3 |
Time derivative of the accel. in RA |
deriv_accel_ra_error | float |
stat.error phys.acceleration |
mas.yr**-3 |
Standard error of Time derivative of the acceleration in RA |
deriv_accel_dec | double | phys.acceleration | mas.yr**-3 |
Time derivative of the accel. in DEC |
deriv_accel_dec_error | float |
stat.error phys.acceleration |
mas.yr**-3 |
Standard error of Time derivative of the acceleration in DEC |
astrometric_n_obs_al | integer | meta.number |
Total astrometric CCD observations in AL considered |
|
astrometric_n_good_obs_al | integer | meta.number |
Total astrometric CCD observations in AL actually used |
|
bit_index | long | meta.code.status |
Boolean mask for the fields above in the corrVec matrix |
|
corr_vec | float[] | stat.correlation |
Vector form of the upper triangle of the correlation matrix |
|
obj_func | float | stat.fit.param |
Value of the objective function at the solution |
|
goodness_of_fit | float | stat.fit.goodness |
Goodness of fit in the Hipparcos sense |
|
significance | float | stat.fit.param |
The significance of the solution (i.e. how worth keeping a model is) |
|
flags | long | meta.code.qual |
Quality flag for the achieved NSS solution |