{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T01:47:33.841Z","years_from_j2000":26.685,"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-1647-b","name":"Kepler-1647 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":3954.4830016266556,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":298.150057,"dec_deg":40.6561751,"epoch_ra_deg":298.380108,"epoch_dec_deg":40.724981,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-1647","semi_major_axis_km":406981007.23934996,"periapsis_km":null,"mass_kg":2.884557080143236e+27,"mass_msun":0.00145069,"constellation":"Cygnus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/kepler-1647-b","radius_km":75732.92159000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-1647","host_v_mag":13.668,"eccentricity":0.0581,"uncertainties":{"mass_kg":[1.2302665807650241e+27,1.2302665807650241e+27],"radius_km":[878.26437,878.26437],"distance_ly":[72.84702696303465,72.84702696303465],"eccentricity":[0.0689,0.0689],"host_mass_solar":[0.0112,0.0112],"inclination_deg":[0.0035,0.0035],"host_radius_solar":[0.0055,0.0055],"host_temperature_k":[100,100],"semi_major_axis_km":[1047185.0948999999,1047185.0948999999],"orbital_period_days":[0.0227,0.0227],"argument_of_periastron_deg":[146.5723,146.5723]},"host_mass_solar":1.2207,"inclination_deg":90.0972,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":1.7903,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":6210,"orbital_period_days":1107.5923,"transit_midpoint_bjd":2454998.4972,"equilibrium_temperature_k":242.92,"argument_of_periastron_deg":155.0464},"designations":[{"catalog":"Exoplanet","designation":"Kepler-1647 b"},{"catalog":"Host star","designation":"Kepler-1647"}],"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."}