{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-08T18:07:44.474Z","years_from_j2000":26.687,"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-1660-ab-b","name":"Kepler-1660 AB b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":3876.499011714582,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":290.5519537,"dec_deg":40.2350445,"epoch_ra_deg":290.777023,"epoch_dec_deg":40.28567,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-1660 A","semi_major_axis_km":119678296.56,"periapsis_km":null,"mass_kg":9.475438001961661e+27,"mass_msun":0.00476533,"constellation":"Lyra","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/kepler-1660-ab-b","radius_km":82277.49,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-1660 A","host_v_mag":13.595,"eccentricity":0.05541,"uncertainties":{"mass_kg":[4.365686579440458e+26,4.365686579440458e+26],"distance_ly":[68.88422697377621,68.88422697377621],"eccentricity":[0.00147,0.00147],"host_mass_solar":[0.0728,0.0728],"inclination_deg":[4.21,4.21],"host_radius_solar":[0.072,0.072],"host_temperature_k":[73.89,73.89],"semi_major_axis_km":[747989.3535,747989.3535],"orbital_period_days":[0.0686,0.0686],"argument_of_periastron_deg":[1.87,1.87]},"host_mass_solar":1.1366,"inclination_deg":86.31,"stars_in_system":2,"discovery_method":"Eclipse Timing Variations","host_radius_solar":1.491,"planets_in_system":1,"discovery_facility":"Kepler","host_spectral_type":"F7 V","host_temperature_k":6305.24,"orbital_period_days":239.5044,"periastron_epoch_bjd":2454995.73,"equilibrium_temperature_k":415.08,"argument_of_periastron_deg":-46.17},"designations":[{"catalog":"Exoplanet","designation":"Kepler-1660 AB b"},{"catalog":"Host star","designation":"Kepler-1660 A"}],"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."}