{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T18:10:33.144Z","years_from_j2000":26.678,"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":"hd-29985-b","name":"HD 29985 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":101.99138240666969,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":70.5216589,"dec_deg":-33.9210696,"epoch_ra_deg":70.771543,"epoch_dec_deg":-33.869353,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 29985","semi_major_axis_km":2003115488.6729999,"periapsis_km":null,"mass_kg":1.0388435934462559e+28,"mass_msun":0.00522449,"constellation":"Caelum","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/hd-29985-b","radius_km":81639.68000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 29985","host_v_mag":9.98,"eccentricity":0.261,"uncertainties":{"mass_kg":[2.196130161924498e+27,3.689954221939009e+27],"distance_ly":[0.07077593396453333,0.07077593396453333],"eccentricity":[0.169,0.144],"host_mass_solar":[0.085,0.085],"inclination_deg":[27.013,32.134],"host_radius_solar":[0.038015,0.040237],"host_temperature_k":[107.02,122.98],"semi_major_axis_km":[550520164.176,309817190.2197],"orbital_period_days":[7737.11195,4708.95644],"argument_of_periastron_deg":[91.445,125.331]},"host_mass_solar":0.75,"inclination_deg":52.658,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.574666,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_temperature_k":4678,"orbital_period_days":20608.14049,"periastron_epoch_bjd":2438955.537,"equilibrium_temperature_k":46.73,"argument_of_periastron_deg":89.414},"designations":[{"catalog":"Exoplanet","designation":"HD 29985 b"},{"catalog":"Host star","designation":"HD 29985"}],"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."}