{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T19:47:29.659Z","years_from_j2000":26.673,"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":"k2-10-b","name":"K2-10 b","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":888.3195103493224,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":172.1216476,"dec_deg":1.6906217,"epoch_ra_deg":172.466342,"epoch_dec_deg":1.542783,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-10","semi_major_axis_km":20494908.2859,"periapsis_km":null,"mass_kg":1.5049863026834275e+26,"mass_msun":0.0000756879,"constellation":"Leo","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/k2-10-b","radius_km":24064.571300000003,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-10","host_v_mag":12.429,"eccentricity":0.31,"uncertainties":{"mass_kg":[5.0166210089447585e+25,5.0166210089447585e+25],"radius_km":[306.14880000000005,561.2728],"distance_ly":[9.92820013769767,10.149986474545056],"eccentricity":[0.18,0.16],"host_mass_solar":[0.04,0.04],"inclination_deg":[0.52796,0.35078],"host_radius_solar":[0.037,0.037],"host_temperature_k":[100,100],"semi_major_axis_km":[224396.80604999998,224396.80604999998],"orbital_period_days":[0.00047,0.00047]},"host_mass_solar":0.88,"inclination_deg":89.50414,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.956,"planets_in_system":1,"discovery_facility":"K2","host_spectral_type":"F9","host_temperature_k":5533,"orbital_period_days":19.30553,"transit_midpoint_bjd":2456819.57944,"equilibrium_temperature_k":649},"designations":[{"catalog":"Exoplanet","designation":"K2-10 b"},{"catalog":"Host star","designation":"K2-10"}],"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."}