Monte-Carlo Markov Chain (MCMC) samples for General Stellar Parametrizer from Photometry (GSP-Phot) parameters (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 T<sub>eff</sub> from GSP-Phot
azero float[] phys.absorption
mag MCMC samples for extinction A<sub>0</sub> 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
mag MCMC samples for extinction in G band from GSP-Phot
mg float[] phys.magAbs
mag MCMC samples for M<sub>G</sub> from GSP-Phot
distancepc float[] pos.distance pc MCMC samples for distance from GSP-Phot
abp float[] phys.absorption
mag MCMC samples for extinction in G<sub>BP</sub> band from GSP-Phot
arp float[] phys.absorption
mag MCMC samples for extinction in G<sub>RP</sub> band from GSP-Phot
ebpminrp float[] phot.color.excess
mag MCMC samples for reddening E(G<sub>BP</sub> - G<sub>RP</sub>) 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