{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-02T23:28:05.871Z","years_from_j2000":26.671,"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-350-d","name":"Kepler-350 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":3120.856654256654,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":285.4195845,"dec_deg":39.7061009,"epoch_ra_deg":285.643425,"epoch_dec_deg":39.74391,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-350","semi_major_axis_km":26718179.70702,"periapsis_km":null,"mass_kg":8.898530123009155e+25,"mass_msun":0.000044752,"constellation":"Lyra","discovered":"2013","featured":false,"url":"https://spacecatalog.org/object/kepler-350-d","radius_km":17858.68,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-350","host_v_mag":13.965,"eccentricity":0,"uncertainties":{"mass_kg":[2.8069188978619484e+25,3.1652489699294308e+25],"radius_km":[3444.1740000000004,8163.968000000001],"distance_ly":[64.61320920757545,64.61320920757545],"host_mass_solar":[0.12,0.2],"host_radius_solar":[0.24,0.57],"host_temperature_k":[30.19,30.19]},"host_mass_solar":1,"inclination_deg":89.65,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.25,"planets_in_system":3,"discovery_facility":"Kepler","host_temperature_k":6492.3,"orbital_period_days":26.136,"transit_midpoint_bjd":2454964.61923,"equilibrium_temperature_k":782},"designations":[{"catalog":"Exoplanet","designation":"Kepler-350 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."}