{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-06T22:36:33.448Z","years_from_j2000":26.682,"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-249893012-b","name":"EPIC 249893012 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1047.927395348788,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":228.2482353,"dec_deg":-16.7246474,"epoch_ra_deg":228.62574,"epoch_dec_deg":-16.825595,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"EPIC 249893012","semi_major_axis_km":7031099.9229,"periapsis_km":null,"mass_kg":5.2256468843174565e+25,"mass_msun":0.0000262805,"constellation":"Libra","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/epic-249893012-b","radius_km":12437.295,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"EPIC 249893012","host_v_mag":11.429,"eccentricity":0.06,"uncertainties":{"mass_kg":[6.44994129721469e+24,6.509662975892603e+24],"radius_km":[510.24800000000005,574.029],"distance_ly":[13.323488029728969,13.662690662554382],"eccentricity":[0.04,0.08],"host_mass_solar":[0.05,0.05],"inclination_deg":[3.5,2.6],"host_radius_solar":[0.04,0.04],"host_temperature_k":[85,85],"semi_major_axis_km":[1047185.0948999999,747989.3535],"orbital_period_days":[0.0003,0.0003],"argument_of_periastron_deg":[123,67]},"host_mass_solar":1.05,"inclination_deg":86.14,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.71,"planets_in_system":3,"discovery_facility":"K2","host_spectral_type":"G8 IV/V","host_temperature_k":5430,"orbital_period_days":3.5951,"periastron_epoch_bjd":2457994.67,"transit_midpoint_bjd":2457994.396,"equilibrium_temperature_k":1616,"argument_of_periastron_deg":225},"designations":[{"catalog":"Exoplanet","designation":"EPIC 249893012 b"}],"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."}