{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T12:36:11.121Z","years_from_j2000":26.672,"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":"kepler-58-d","name":"Kepler-58 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":3161.2772141470896,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":296.3586251,"dec_deg":39.1152033,"epoch_ra_deg":296.592912,"epoch_dec_deg":39.179794,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-58","semi_major_axis_km":35305097.485199995,"periapsis_km":null,"mass_kg":1.4652295811875403e+27,"mass_msun":0.000736885,"constellation":"Cygnus","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-58-d","radius_km":18751.614,"radius_kind":null,"data_quality":"The published mass and radius imply a density no material has. One of the two is likely an upper limit rather than a measurement.","description":null,"properties":{"host_star":"Kepler-58","host_v_mag":15.086,"eccentricity":0,"uncertainties":{"radius_km":[8929.34,8929.34],"distance_ly":[76.05966728354457,79.83655813750445],"host_mass_solar":[0.027,0.024],"host_radius_solar":[0.526,0.526],"host_temperature_k":[200,200],"orbital_period_days":[0.000612,0.000612]},"host_mass_solar":1.024,"inclination_deg":88.44,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.127,"planets_in_system":4,"discovery_facility":"Kepler","host_temperature_k":6099,"orbital_period_days":40.101371,"transit_midpoint_bjd":2454965.71799,"equilibrium_temperature_k":583},"designations":[{"catalog":"Exoplanet","designation":"Kepler-58 d"}],"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."}