{"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":"2026-09-05T03:30:55.361Z","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-47-b","name":"HAT-P-47 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":920.0740952838245,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":38.3080745,"dec_deg":30.360453,"epoch_ra_deg":38.705818,"epoch_dec_deg":30.478887,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HAT-P-47","semi_major_axis_km":null,"periapsis_km":null,"mass_kg":3.910136675379401e+26,"mass_msun":0.000196646,"constellation":"Aries","discovered":"2026","featured":false,"url":"https://spacecatalog.org/object/hat-p-47-b","radius_km":93868.995746646,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HAT-P-47","host_v_mag":10.609,"uncertainties":{"mass_kg":[7.40268593725956e+25,7.40268593725956e+25],"radius_km":[3217.139981553,3217.139981553],"distance_ly":[15.238025966926251,15.753353043718707],"host_mass_solar":[0.038,0.038],"inclination_deg":[0.3,0.25],"host_radius_solar":[0.04,0.04],"host_temperature_k":[50,50],"orbital_period_days":[5.5e-7,5.5e-7]},"host_mass_solar":1.387,"inclination_deg":84.56,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.515,"planets_in_system":1,"discovery_facility":"Transiting Exoplanet Survey Satellite (TESS)","host_spectral_type":"F","host_temperature_k":6703,"orbital_period_days":4.73217441,"transit_midpoint_bjd":2458387.36996,"equilibrium_temperature_k":1605},"designations":[{"catalog":"Exoplanet","designation":"HAT-P-47 b"},{"catalog":"Host star","designation":"HAT-P-47"}],"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."}