{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T20:54:09.700Z","years_from_j2000":26.684,"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-34-b","name":"HAT-P-34 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":813.1893887422705,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":303.1954355,"dec_deg":18.1047776,"epoch_ra_deg":303.49834,"epoch_dec_deg":18.18508,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HAT-P-34","semi_major_axis_km":10133759.761217998,"periapsis_km":null,"mass_kg":6.320786597689046e+27,"mass_msun":0.00317881,"constellation":"Sagitta","discovered":"2011","featured":false,"url":"https://spacecatalog.org/object/hat-p-34-b","radius_km":85576.0711113,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HAT-P-34","host_v_mag":10.403,"eccentricity":0.432,"uncertainties":{"mass_kg":[3.7962682268402685e+26,3.9860816381822815e+26],"radius_km":[6577.2753068,9293.975977000002],"distance_ly":[8.94973100454744,9.145424831177484],"eccentricity":[0.027,0.029],"host_mass_solar":[0.047,0.047],"inclination_deg":[1.2,1.2],"host_radius_solar":[0.1,0.14],"host_temperature_k":[88,88],"semi_major_axis_km":[113694.381732,110702.42431799999],"orbital_period_days":[0.000016,0.000016],"argument_of_periastron_deg":[5.6,5.2]},"host_mass_solar":1.392,"inclination_deg":87.1,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.53,"planets_in_system":1,"discovery_facility":"HATNet","host_temperature_k":6442,"orbital_period_days":5.452654,"transit_midpoint_bjd":2455431.59706,"equilibrium_temperature_k":1520,"argument_of_periastron_deg":21.9},"designations":[{"catalog":"Exoplanet","designation":"HAT-P-34 b"},{"catalog":"Host star","designation":"HAT-P-34"}],"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."}