{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.688","julian_year":2026.688,"time":"2026-09-09T04:11:51.283Z","years_from_j2000":26.688,"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-d","name":"EPIC 249893012 d","class":"neptune_like_planet","category":"exoplanet","object_type":"Neptune-like planet","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":228.625829,"epoch_dec_deg":-16.82564,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"EPIC 249893012","semi_major_axis_km":32911531.553999998,"periapsis_km":null,"mass_kg":6.079666889411624e+25,"mass_msun":0.0000305755,"constellation":"Libra","discovered":"2020","featured":false,"url":"https://spacecatalog.org/object/epic-249893012-d","radius_km":25129.714,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"EPIC 249893012","host_v_mag":11.429,"eccentricity":0.15,"uncertainties":{"mass_kg":[1.4452646240055138e+25,1.4691532954766793e+25],"radius_km":[765.3720000000001,829.153],"distance_ly":[13.323488029728969,13.662690662554382],"eccentricity":[0.11,0.21],"host_mass_solar":[0.05,0.05],"inclination_deg":[0.5,0.36],"host_radius_solar":[0.04,0.04],"host_temperature_k":[85,85],"semi_major_axis_km":[5983914.828,2991957.414],"orbital_period_days":[0.005,0.005],"argument_of_periastron_deg":[61,81]},"host_mass_solar":1.05,"inclination_deg":89.47,"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":35.747,"periastron_epoch_bjd":2458008.77,"transit_midpoint_bjd":2458008.652,"equilibrium_temperature_k":752,"argument_of_periastron_deg":181},"designations":[{"catalog":"Exoplanet","designation":"EPIC 249893012 d"},{"catalog":"Host star","designation":"EPIC 249893012"}],"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."}