{"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":"2026-09-03T00:58:04.555Z","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":"k2-403-b","name":"K2-403 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":804.2983658857121,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":164.1893864,"dec_deg":9.6739464,"epoch_ra_deg":164.540607,"epoch_dec_deg":9.530616,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-403","semi_major_axis_km":null,"periapsis_km":null,"mass_kg":1.4691532954766793e+26,"mass_msun":0.0000738858,"constellation":"Leo","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/k2-403-b","radius_km":34014.407300000006,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-403","host_v_mag":12.305,"uncertainties":{"radius_km":[2468.3247,2276.9817],"distance_ly":[8.183263516913092,8.352864833325798],"host_mass_solar":[0.241,0.34],"host_radius_solar":[0.052,0.056],"host_temperature_k":[138,138],"orbital_period_days":[0.000768,0.000768]},"host_mass_solar":0.784,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.886,"planets_in_system":1,"discovery_facility":"K2","host_spectral_type":"G4","host_temperature_k":5511,"orbital_period_days":33.589979,"transit_midpoint_bjd":2457908.9613,"equilibrium_temperature_k":949},"designations":[{"catalog":"Exoplanet","designation":"K2-403 b"},{"catalog":"Host star","designation":"K2-403"}],"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."}