{"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":"2026-09-08T23:07:24.105Z","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-228836835-b","name":"EPIC 228836835 b","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":489.63900048348387,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":189.5748998,"dec_deg":-5.2446247,"epoch_ra_deg":189.921354,"epoch_dec_deg":-5.39246,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"EPIC 228836835","semi_major_axis_km":null,"periapsis_km":null,"mass_kg":8.181869978874191e+24,"mass_msun":0.00000411478,"constellation":"Virgo","discovered":"2021","featured":false,"url":"https://spacecatalog.org/object/epic-228836835-b","radius_km":7015.910000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"EPIC 228836835","host_v_mag":16.77,"uncertainties":{"radius_km":[1275.6200000000001,1913.43],"distance_ly":[5.733829120260349,5.8675532351242135],"host_mass_solar":[0.020881,0.020881],"inclination_deg":[5,7],"host_radius_solar":[0.07,0.07],"host_temperature_k":[152,152],"orbital_period_days":[0.000063,0.000063]},"host_mass_solar":0.418179,"inclination_deg":89.7,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.32,"planets_in_system":1,"discovery_facility":"K2","host_temperature_k":3782,"orbital_period_days":0.728113,"transit_midpoint_bjd":2457585.45061,"equilibrium_temperature_k":932},"designations":[{"catalog":"Exoplanet","designation":"EPIC 228836835 b"},{"catalog":"Host star","designation":"EPIC 228836835"}],"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."}