{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T12:40:27.842Z","years_from_j2000":26.672,"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-108-b","name":"Kepler-108 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1104.7960213674794,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":294.5589885,"dec_deg":46.0623952,"epoch_ra_deg":294.760905,"epoch_dec_deg":46.122681,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-108","semi_major_axis_km":43682578.244399995,"periapsis_km":null,"mass_kg":3.344414005963173e+26,"mass_msun":0.000168195,"constellation":"Cygnus","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-108-b","radius_km":55170.565,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-108","host_v_mag":12.657,"eccentricity":0.22,"uncertainties":{"radius_km":[3061.4880000000003,3061.4880000000003],"eccentricity":[0.12,0.19],"host_mass_solar":[0.067,0.082],"host_radius_solar":[0.121,0.121],"host_temperature_k":[92,92],"orbital_period_days":[0.000054,0.000054]},"host_mass_solar":1.247,"inclination_deg":89.94,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":2.192,"planets_in_system":2,"discovery_facility":"Kepler","host_temperature_k":5854,"orbital_period_days":49.183921,"transit_midpoint_bjd":2454974.91123,"equilibrium_temperature_k":669},"designations":[{"catalog":"Exoplanet","designation":"Kepler-108 b"},{"catalog":"Host star","designation":"Kepler-108"}],"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."}