{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T07:06:35.733Z","years_from_j2000":26.669,"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":"k2-58-d","name":"K2-58 d","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":592.7761702450725,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":333.8218395,"dec_deg":-14.049857,"epoch_ra_deg":334.182676,"epoch_dec_deg":-13.916523,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-58","semi_major_axis_km":22693996.985189997,"periapsis_km":null,"mass_kg":2.1320639288015223e+25,"mass_msun":0.0000107225,"constellation":"Aquarius","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/k2-58-d","radius_km":10906.551000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-58","host_v_mag":12.415,"uncertainties":{"radius_km":[1594.525,1594.525],"distance_ly":[4.608589617137585,4.680344020235268],"host_mass_solar":[0.08,0.08],"inclination_deg":[0.80853,0.40609],"host_radius_solar":[0.1,0.1],"host_temperature_k":[255,255],"semi_major_axis_km":[688150.2052199999,688150.2052199999],"orbital_period_days":[0.004,0.004]},"host_mass_solar":0.89,"inclination_deg":89.43128,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.86,"planets_in_system":3,"discovery_facility":"K2","host_temperature_k":5413,"orbital_period_days":22.8827,"transit_midpoint_bjd":2456998.0703,"equilibrium_temperature_k":621.48},"designations":[{"catalog":"Exoplanet","designation":"K2-58 d"},{"catalog":"Host star","designation":"K2-58"}],"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":"2026-09-01T22:58:55.274Z","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."}