{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-06T00:59:41.878Z","years_from_j2000":26.679,"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-58-b","name":"HAT-P-58 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1681.6296678697574,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":68.8465093,"dec_deg":56.8682691,"epoch_ra_deg":69.403754,"epoch_dec_deg":56.923697,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HAT-P-58","semi_major_axis_km":7470917.662757999,"periapsis_km":null,"mass_kg":7.061023510856114e+26,"mass_msun":0.000355109,"constellation":"Camelopardalis","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/hat-p-58-b","radius_km":95227.343721849,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HAT-P-58","host_v_mag":12.925,"uncertainties":{"mass_kg":[5.694373799270162e+25,5.694373799270162e+25],"radius_km":[3074.155990877,3074.155990877],"distance_ly":[39.738893061008014,41.6730003808683],"host_mass_solar":[0.028,0.028],"inclination_deg":[0.34,0.34],"host_radius_solar":[0.034,0.034],"host_temperature_k":[48,48],"semi_major_axis_km":[65823.063108,65823.063108],"orbital_period_days":[0.0000024,0.0000024]},"host_mass_solar":1.031,"inclination_deg":85.64,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.53,"planets_in_system":1,"discovery_facility":"HATNet","host_temperature_k":6078,"orbital_period_days":4.0138379,"transit_midpoint_bjd":2457369.03094,"eccentricity_upper_limit":0.073,"equilibrium_temperature_k":1622},"designations":[{"catalog":"Exoplanet","designation":"HAT-P-58 b"},{"catalog":"Host star","designation":"HAT-P-58"}],"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."}