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lucasw/esa_gaia.md

Last active October 28, 2019 12:31
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ESA Gaia data
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esa_gaia.md

https://en.wikipedia.org/wiki/Gaia_(spacecraft)

http://cdn.gea.esac.esa.int/Gaia

Visualize the data as a point cloud?

The files look to be mainly csv files.

http://cdn.gea.esac.esa.int/Gaia/gdr2/gaia_source/csv/ has many files.

GaiaSource_4384641780735931776_4384769328379906560.csv first lines:

solution_id,designation,source_id,random_index,ref_epoch,ra,ra_error,dec,dec_error,parallax,parallax_error,parallax_over_error,pmra,pmra_error,pmdec,pmdec_error,ra_dec_corr,ra_parallax_corr,ra_pmra_corr,ra_pmdec_corr,dec_parallax_corr,dec_pmra_corr,dec_pmdec_corr,parallax_pmra_corr,parallax_pmdec_corr,pmra_pmdec_corr,astrometric_n_obs_al,astrometric_n_obs_ac,astrometric_n_good_obs_al,astrometric_n_bad_obs_al,astrometric_gof_al,astrometric_chi2_al,astrometric_excess_noise,astrometric_excess_noise_sig,astrometric_params_solved,astrometric_primary_flag,astrometric_weight_al,astrometric_pseudo_colour,astrometric_pseudo_colour_error,mean_varpi_factor_al,astrometric_matched_observations,visibility_periods_used,astrometric_sigma5d_max,frame_rotator_object_type,matched_observations,duplicated_source,phot_g_n_obs,phot_g_mean_flux,phot_g_mean_flux_error,phot_g_mean_flux_over_error,phot_g_mean_mag,phot_bp_n_obs,phot_bp_mean_flux,phot_bp_mean_flux_error,phot_bp_mean_flux_over_error,phot_bp_mean_mag,phot_rp_n_obs,phot_rp_mean_flux,phot_rp_mean_flux_error,phot_rp_mean_flux_over_error,phot_rp_mean_mag,phot_bp_rp_excess_factor,phot_proc_mode,bp_rp,bp_g,g_rp,radial_velocity,radial_velocity_error,rv_nb_transits,rv_template_teff,rv_template_logg,rv_template_fe_h,phot_variable_flag,l,b,ecl_lon,ecl_lat,priam_flags,teff_val,teff_percentile_lower,teff_percentile_upper,a_g_val,a_g_percentile_lower,a_g_percentile_upper,e_bp_min_rp_val,e_bp_min_rp_percentile_lower,e_bp_min_rp_percentile_upper,flame_flags,radius_val,radius_percentile_lower,radius_percentile_upper,lum_val,lum_percentile_lower,lum_percentile_upper
1635721458409799680,Gaia DR2 4384732593524013952,4384732593524013952,1308187720,2015.5,253.32954758823823,0.22557435500113648,1.7775426803652392,0.16886753515055727,0.040002543711688064,0.25613947775546997,0.15617485,9.0340509109919,0.4997063109414716,-6.159843765169916,0.34063543402638397,0.39758092,-0.016338859,-0.50412846,-0.44107494,0.07837271,-0.49857464,-0.7111071,-0.23381951,0.05992319,0.52440685,284,0,283,1,0.33816978,285.37146,0.0,0.0,31,false,0.36921385,1.6546409658338035,0.043574234233414104,0.05531374,32,14,0.50803405,0,33,false,292,602.2322001416725,1.1719364264009104,513.87787,18.738956,30,338.54265271315245,8.801823568410425,38.462784,19.027355,31,397.8113125665052,4.279210672687352,92.963715,18.262728,1.2227077,0,0.76462746,0.28839874,0.4762287,,,0,,,,NOT_AVAILABLE,20.16679418551932,26.909899569704002,251.68369873567943,24.163047611961176,,,,,,,,,,,,,,,,,
solution_id designation source_id random_index ref_epoch ra ra_error dec dec_error parallax parallax_error parallax_over_error pmra pmra_error pmdec pmdec_error ra_dec_corr ra_parallax_corr ra_pmra_corr ra_pmdec_corr dec_parallax_corr dec_pmra_corr dec_pmdec_corr parallax_pmra_corr parallax_pmdec_corr pmra_pmdec_corr astrometric_n_obs_al astrometric_n_obs_ac astrometric_n_good_obs_al astrometric_n_bad_obs_al astrometric_gof_al astrometric_chi2_al astrometric_excess_noise astrometric_excess_noise_sig astrometric_params_solved astrometric_primary_flag astrometric_weight_al astrometric_pseudo_colour astrometric_pseudo_colour_error mean_varpi_factor_al astrometric_matched_observations visibility_periods_used astrometric_sigma5d_max frame_rotator_object_type matched_observations duplicated_source phot_g_n_obs phot_g_mean_flux phot_g_mean_flux_error phot_g_mean_flux_over_error phot_g_mean_mag phot_bp_n_obs phot_bp_mean_flux phot_bp_mean_flux_error phot_bp_mean_flux_over_error phot_bp_mean_mag phot_rp_n_obs phot_rp_mean_flux phot_rp_mean_flux_error phot_rp_mean_flux_over_error phot_rp_mean_mag phot_bp_rp_excess_factor phot_proc_mode bp_rp bp_g g_rp radial_velocity radial_velocity_error rv_nb_transits rv_template_teff rv_template_logg rv_template_fe_h phot_variable_flag l b ecl_lon ecl_lat priam_flags teff_val teff_percentile_lower teff_percentile_upper a_g_val a_g_percentile_lower a_g_percentile_upper e_bp_min_rp_val e_bp_min_rp_percentile_lower e_bp_min_rp_percentile_upper flame_flags radius_val radius_percentile_lower radius_percentile_upper lum_val lum_percentile_lower lum_percentile_upper
1635721458409799680 Gaia DR2 4384732593524013952 4384732593524013952 1308187720 2015.5 253.32954758823823 0.22557435500113648 1.7775426803652392 0.16886753515055727 0.040002543711688064 0.25613947775546997 0.15617485 9.0340509109919 0.4997063109414716 -6.159843765169916 0.34063543402638397 0.39758092 -0.016338859 -0.50412846 -0.44107494 0.07837271 -0.49857464 -0.7111071 -0.23381951 0.05992319 0.52440685 284 0 283 1 0.33816978 285.37146 0.0 0.0 31 false 0.36921385 1.6546409658338035 0.043574234233414104 0.05531374 32 14 0.50803405 0 33 false 292 602.2322001416725 1.1719364264009104 513.87787 18.738956 30 338.54265271315245 8.801823568410425 38.462784 19.027355 31 397.8113125665052 4.279210672687352 92.963715 18.262728 1.2227077 0 0.76462746 0.28839874 0.4762287 0 NOT_AVAILABLE 20.16679418551932 26.909899569704002 251.68369873567943 24.163047611961176
@lucasw
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lucasw commented Nov 10, 2018 •
edited

pmra -> 'proper motion in right ascension'

https://gea.esac.esa.int/archive/documentation/GDR2/Gaia_archive/chap_datamodel/sec_dm_main_tables/ssec_dm_gaia_source.html

Does distance have to be calculated from parallax, or is it in there?

@iontom
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iontom commented Oct 28, 2019

Hey did you ever find an answer? Any chance you have RA, DEC, est_dist from Gaia data already?

@lucasw
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lucasw commented Oct 28, 2019 •
edited

I think this is it:

https://lco.global/spacebook/distance/parallax-and-distance-measurement/

Distance parsecs = 1.0 / (parallax / 1000.0)

The parallax in the data is described as angle[mas] which I'm sure is milli-arc-seconds.

The right ascension and declination is right there in the table.

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