{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T10:41:48.137Z","years_from_j2000":26.677,"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-50-b","name":"HAT-P-50 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1681.1991414511713,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":118.0634379,"dec_deg":12.1393474,"epoch_ra_deg":118.43607,"epoch_dec_deg":12.070587,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HAT-P-50","semi_major_axis_km":6776783.54271,"periapsis_km":null,"mass_kg":2.562481053117181e+27,"mass_msun":0.00128871,"constellation":"Canis Minor","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/hat-p-50-b","radius_km":92081.8542952,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HAT-P-50","host_v_mag":11.703,"uncertainties":{"mass_kg":[1.3856379027966979e+26,1.3856379027966979e+26],"radius_km":[4575.495865600001,4575.495865600001],"distance_ly":[51.19676661019721,54.45506882358749],"host_mass_solar":[0.115,0.049],"inclination_deg":[0.57,0.57],"host_radius_solar":[0.071,0.071],"host_temperature_k":[49,49],"semi_major_axis_km":[209437.01898,86766.76500599999],"orbital_period_days":[0.0000065,0.0000065]},"host_mass_solar":1.273,"inclination_deg":83.65,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.698,"planets_in_system":1,"discovery_facility":"HATNet","host_spectral_type":"F5","host_temperature_k":6280,"orbital_period_days":3.1220109,"transit_midpoint_bjd":2456285.90993,"eccentricity_upper_limit":0.115,"equilibrium_temperature_k":1862},"designations":[{"catalog":"Exoplanet","designation":"HAT-P-50 b"},{"catalog":"Host star","designation":"HAT-P-50"}],"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."}