{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-08T19:07:03.964Z","years_from_j2000":26.687,"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":"epic-201841433-b","name":"EPIC 201841433 b","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1423.633449968259,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":175.206752,"dec_deg":6.1348146,"epoch_ra_deg":175.552581,"epoch_dec_deg":5.985887,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"EPIC 201841433","semi_major_axis_km":5235925.4745000005,"periapsis_km":null,"mass_kg":6.688828011926346e+24,"mass_msun":0.00000336391,"constellation":"Virgo","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/epic-201841433-b","radius_km":6633.224,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"EPIC 201841433","host_v_mag":14.983,"uncertainties":{"radius_km":[204.09920000000002,235.9897],"distance_ly":[25.72721507429672,26.673071831239053],"host_mass_solar":[0.163,0.081],"inclination_deg":[0.5574,0.5117],"host_radius_solar":[0.024858,0.04342],"host_temperature_k":[166,103],"semi_major_axis_km":[149597.8707,134638.08362999998],"orbital_period_days":[0.0001,0.0001]},"host_mass_solar":0.802,"inclination_deg":89.001,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.628461,"planets_in_system":1,"discovery_facility":"K2","host_temperature_k":5053,"orbital_period_days":4.1698,"transit_midpoint_bjd":2456811.6359,"equilibrium_temperature_k":1032.49},"designations":[{"catalog":"Exoplanet","designation":"EPIC 201841433 b"},{"catalog":"Host star","designation":"EPIC 201841433"}],"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."}