{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T13:55:31.371Z","years_from_j2000":26.667,"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-102-e","name":"Kepler-102 e","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":351.58352892354077,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":281.4824731,"dec_deg":47.2078263,"epoch_ra_deg":281.667714,"epoch_dec_deg":47.235549,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-102","semi_major_axis_km":17383272.57534,"periapsis_km":null,"mass_kg":2.8069188978619484e+25,"mass_msun":0.0000141164,"constellation":"Lyra","discovered":"2013","featured":false,"url":"https://spacecatalog.org/object/kepler-102-e","radius_km":13840.477,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-102","host_v_mag":12.072,"uncertainties":{"mass_kg":[1.0749902162024483e+25,1.0749902162024483e+25],"radius_km":[701.591,701.591],"distance_ly":[0.714282467199668,0.7175440309768355],"host_mass_solar":[0.021,0.021],"inclination_deg":[0.051,0.051],"host_radius_solar":[0.018,0.018],"host_temperature_k":[98,98],"semi_major_axis_km":[149597.8707,149597.8707],"orbital_period_days":[0.0000022,0.0000022]},"host_mass_solar":0.803,"inclination_deg":89.488,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.724,"planets_in_system":5,"discovery_facility":"Kepler","host_temperature_k":4909,"orbital_period_days":16.1456994,"transit_midpoint_bjd":2454967.7537,"eccentricity_upper_limit":0.089,"equilibrium_temperature_k":590},"designations":[{"catalog":"Exoplanet","designation":"Kepler-102 e"}],"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":"2026-08-30T09:56:50.739Z","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."}