{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T21:20:14.881Z","years_from_j2000":26.681,"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":"hats-39-b","name":"HATS-39 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2865.352271080911,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":112.4192251,"dec_deg":-29.9379163,"epoch_ra_deg":112.683305,"epoch_dec_deg":-29.993157,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HATS-39","semi_major_axis_km":8986344.092949,"periapsis_km":null,"mass_kg":1.1958244914546845e+27,"mass_msun":0.000601397,"constellation":"Puppis","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/hats-39-b","radius_km":112242.63295300001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HATS-39","host_v_mag":12.745,"uncertainties":{"mass_kg":[2.4675743474461742e+26,2.4675743474461742e+26],"radius_km":[8579.054748,8579.054748],"distance_ly":[221.09162376284888,260.67396176255284],"host_mass_solar":[0.04,0.04],"inclination_deg":[0.49,0.49],"host_radius_solar":[0.085,0.085],"host_temperature_k":[83,83],"semi_major_axis_km":[86766.76500599999,86766.76500599999],"orbital_period_days":[0.0000073,0.0000073]},"host_mass_solar":1.379,"inclination_deg":84.98,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.621,"planets_in_system":1,"discovery_facility":"HATSouth","host_temperature_k":6572,"orbital_period_days":4.5776348,"transit_midpoint_bjd":2457315.28338,"eccentricity_upper_limit":0.275,"equilibrium_temperature_k":1645},"designations":[{"catalog":"Exoplanet","designation":"HATS-39 b"},{"catalog":"Host star","designation":"HATS-39"}],"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."}