{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-04T20:34:56.999Z","years_from_j2000":26.676,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"hat-p-29-b","name":"HAT-P-29 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1022.7481229890554,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":33.1310921,"dec_deg":51.7787754,"epoch_ra_deg":33.577401,"epoch_dec_deg":51.904925,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HAT-P-29","semi_major_axis_km":9978177.975689998,"periapsis_km":null,"mass_kg":1.670358019809718e+27,"mass_msun":0.000840047,"constellation":"Perseus","discovered":"2011","featured":false,"url":"https://spacecatalog.org/object/hat-p-29-b","radius_km":83645.78379300001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HAT-P-29","host_v_mag":11.825,"eccentricity":0.09,"uncertainties":{"mass_kg":[4.745335283550335e+26,4.745335283550335e+26],"radius_km":[9293.975977000002,9293.975977000002],"distance_ly":[14.05733987959164,14.448727532851732],"eccentricity":[0.05,0.05],"host_mass_solar":[0.6,0.6],"inclination_deg":[0.6,0.6],"host_radius_solar":[0.14,0.14],"host_temperature_k":[88,88],"semi_major_axis_km":[119678.29656,119678.29656],"orbital_period_days":[0.000049,0.000049],"argument_of_periastron_deg":[16,20]},"host_mass_solar":1.45,"inclination_deg":87.1,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":1.3,"planets_in_system":1,"discovery_facility":"HATNet","host_spectral_type":"F8","host_temperature_k":6087,"orbital_period_days":5.72319,"periastron_epoch_bjd":2456464.1,"transit_midpoint_bjd":2456210.61536,"equilibrium_temperature_k":1281,"argument_of_periastron_deg":159},"designations":[{"catalog":"Exoplanet","designation":"HAT-P-29 b"},{"catalog":"Host star","designation":"HAT-P-29"}],"source":{"id":"exoplanet_archive","name":"NASA Exoplanet Archive (Planetary Systems Composite Parameters)","url":"https://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=PSCompPars","license":"Public domain (NASA)"},"updated_at":"2026-09-02T19:50:56.720Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}