{"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":"2026-09-02T15:51:10.829Z","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-128-b","name":"Kepler-128 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1292.8153884298504,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":282.4922622,"dec_deg":43.9802442,"epoch_ra_deg":282.694942,"epoch_dec_deg":44.010587,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-128","semi_major_axis_km":18767052.879315,"periapsis_km":null,"mass_kg":2.263451621892933e+25,"mass_msun":0.0000113832,"constellation":"Lyra","discovered":"2013","featured":false,"url":"https://spacecatalog.org/object/kepler-128-b","radius_km":9063.2801,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-128","host_v_mag":11.693,"eccentricity":0,"uncertainties":{"mass_kg":[3.9416307927423103e+24,4.538847579521448e+24],"radius_km":[255.12400000000002,255.12400000000002],"distance_ly":[12.628774945192305,12.873392228479863],"host_mass_solar":[0.074,0.074],"host_radius_solar":[0.038,0.038],"host_temperature_k":[75,75],"semi_major_axis_km":[308171.613642,308171.613642]},"host_mass_solar":1.184,"inclination_deg":89.96,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.659,"planets_in_system":2,"discovery_facility":"Kepler","host_temperature_k":6072,"orbital_period_days":15,"transit_midpoint_bjd":2455008.95561,"equilibrium_temperature_k":968},"designations":[{"catalog":"Exoplanet","designation":"Kepler-128 b"},{"catalog":"Host star","designation":"Kepler-128"}],"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."}