{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-04T20:06:24.878Z","years_from_j2000":26.676,"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-63-b","name":"HAT-P-63 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1315.9039984084188,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":269.5720695,"dec_deg":5.7613709,"epoch_ra_deg":269.901105,"epoch_dec_deg":5.758395,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HAT-P-63","semi_major_axis_km":6423732.567857999,"periapsis_km":null,"mass_kg":1.1654485042625708e+27,"mass_msun":0.000586121,"constellation":"Ophiuchus","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/hat-p-63-b","radius_km":79999.54775814,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HAT-P-63","host_v_mag":13.657,"uncertainties":{"mass_kg":[4.555499040610563e+25,4.555499040610563e+25],"radius_km":[2359.235973716,2359.235973716],"distance_ly":[12.733144986061662,12.981023833126388],"host_mass_solar":[0.023,0.023],"inclination_deg":[0.44,0.44],"host_radius_solar":[0.0082,0.011],"host_temperature_k":[39,55],"semi_major_axis_km":[52359.254745,52359.254745],"orbital_period_days":[0.000013,0.000013]},"host_mass_solar":0.925,"inclination_deg":88.45,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.9661,"planets_in_system":1,"discovery_facility":"HATNet","host_temperature_k":5400,"orbital_period_days":3.377728,"transit_midpoint_bjd":2456382.94256,"eccentricity_upper_limit":0.069,"equilibrium_temperature_k":1237},"designations":[{"catalog":"Exoplanet","designation":"HAT-P-63 b"},{"catalog":"Host star","designation":"HAT-P-63"}],"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."}