{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T13:25:36.838Z","years_from_j2000":26.67,"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-240-c","name":"Kepler-240 c","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":2436.15004738834,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":291.1587635,"dec_deg":40.7502108,"epoch_ra_deg":291.381922,"epoch_dec_deg":40.802288,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-240","semi_major_axis_km":11070242.431799999,"periapsis_km":null,"mass_kg":6.109527728750581e+26,"mass_msun":0.000307257,"constellation":"Lyra","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-240-c","radius_km":14031.820000000002,"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-240","host_v_mag":15.953,"eccentricity":0,"uncertainties":{"mass_kg":[2.3530341399098034e+26,2.585948686753667e+26],"radius_km":[5676.509,5676.509],"distance_ly":[62.413284439876016,65.7205101099238],"host_mass_solar":[0.019,0.017],"host_radius_solar":[0.299,0.299],"host_temperature_k":[200,200],"orbital_period_days":[0.000025,0.000025]},"host_mass_solar":0.868,"inclination_deg":89.24,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.739,"planets_in_system":2,"discovery_facility":"Kepler","host_temperature_k":4985,"orbital_period_days":7.953528,"transit_midpoint_bjd":2455007.66155,"equilibrium_temperature_k":696},"designations":[{"catalog":"Exoplanet","designation":"Kepler-240 c"}],"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."}