{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T20:42:58.563Z","years_from_j2000":26.681,"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":"koi-1599-01","name":"KOI-1599.01","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":3690.9160327937557,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":298.3738383,"dec_deg":40.6184483,"epoch_ra_deg":298.604241,"epoch_dec_deg":40.687773,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"KOI-1599","semi_major_axis_km":22032774.396695998,"periapsis_km":null,"mass_kg":2.7471972191840344e+25,"mass_msun":0.0000138161,"constellation":"Cygnus","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/koi-1599-01","radius_km":12118.39,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"KOI-1599","host_v_mag":14.795,"eccentricity":0.014,"uncertainties":{"mass_kg":[1.7916503603374138e+24,1.7916503603374138e+24],"radius_km":[1913.43,1913.43],"distance_ly":[87.60560305471728,91.87825160280663],"inclination_deg":[0.16,0.16],"host_temperature_k":[122,122],"orbital_period_days":[0.0013,0.0013]},"host_mass_solar":1.02,"inclination_deg":89.78,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.972,"planets_in_system":2,"discovery_facility":"Kepler","host_temperature_k":5833,"orbital_period_days":20.4415,"transit_midpoint_bjd":2454952.73,"equilibrium_temperature_k":660,"argument_of_periastron_deg":230.175},"designations":[{"catalog":"Exoplanet","designation":"KOI-1599.01"}],"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."}