MCMC samples for GSP from Photometry (gaiadr3.mcmc_samples_gsp_phot)

The table has 193328097 rows, 16 columns.


This is the DataLink table hosting Monte-Carlo Markov Chain (MCMC) samples for the posterior probability distribution of all parameters derived from the General Stellar Parametrizer from Photometry (GSP-Phot, see Section cu8par_apsis_gspphot in the online documentation). 2000 MCMC samples are provided for 1) all sources brighter than G=12, 2) a random subset of 0.1% of the sources fainter than G=12. For all other sources fainter than G=12, the sample size is 100 (the last 100 samples in the MCMC).The table considers the following parameters:

  • effective temperature Teff in K
  • monochromatic extinction at 547.7~nm A0 in mag
  • surface gravity log g
  • metallicity [M/H]
  • G-band extinction in mag
  • absolute magnitude MG in mag
  • distance in pc
  • GBP band extinction ABP in mag
  • GRP band extinction ARP in mag
  • reddening E(GBP - GRP) = ABP - ARP in mag
  • logarithmic posterior probability
  • logarithmic likelihood
  • stellar radius in R


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 (, processed by the Gaia Data Processing and Analysis Consortium (DPAC, 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.


Name Type UCD Unit Description
solution_id long meta.version

Solution Identifier

source_id long

Unique source identifier (unique within a particular Data Release)

nsamples short meta.number

Number of samples in the chain from GSP-Phot

teff float[] phys.temperature.effective K

MCMC samples for Teff from GSP-Phot

azero float[] phys.absorption

MCMC samples for extinction A0 from GSP-Phot

logg float[] phys.gravity log(cm.s**-2)

MCMC samples for log g from GSP-Phot

mh float[] phys.abund "dex"

MCMC samples for the metallicity from GSP-Phot

ag float[] phys.absorption

MCMC samples for extinction in G band from GSP-Phot

mg float[] phys.magAbs

MCMC samples for MG from GSP-Phot

distancepc float[] pos.distance pc

MCMC samples for distance from GSP-Phot

abp float[] phys.absorption

MCMC samples for extinction in GBP band from GSP-Phot

arp float[] phys.absorption

MCMC samples for extinction in GRP band from GSP-Phot

ebpminrp float[] phot.color.excess

MCMC samples for reddening E(GBP - GRP) from GSP-Phot

log_pos float[] stat.probability

MCMC samples for the log-posterior from GSP-Phot

log_lik float[] stat.likelihood

MCMC samples for the log-likelihood from GSP-Phot

radius float[] phys.size.radius solRad

MCMC samples for stellar radius from GSP-Phot