{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T05:42:58.582Z","years_from_j2000":26.682,"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-12-b","name":"KOI-12 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1302.662049473119,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":297.4537402,"dec_deg":41.0110188,"epoch_ra_deg":297.681615,"epoch_dec_deg":41.078204,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"KOI-12","semi_major_axis_km":23038072.087799996,"periapsis_km":null,"mass_kg":2.0879475247621475e+27,"mass_msun":0.00105006,"constellation":"Cygnus","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/koi-12-b","radius_km":87935.311167,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"KOI-12","host_v_mag":11.51,"eccentricity":0.34,"uncertainties":{"mass_kg":[1.5185072907361074e+27,6.643469396970469e+27],"radius_km":[3574.606145,4289.527374],"distance_ly":[14.03450893315147,14.33783436442804],"eccentricity":[0.07,0.08],"host_mass_solar":[0.1,0.1],"inclination_deg":[0.25,0.15],"host_radius_solar":[0.06,0.07],"host_temperature_k":[71,71],"semi_major_axis_km":[448793.61209999997,598391.4828],"orbital_period_days":[0.000006,0.000008],"argument_of_periastron_deg":[120,120]},"host_mass_solar":1.5,"inclination_deg":88.95,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.4,"planets_in_system":2,"discovery_facility":"Kepler","host_temperature_k":6635,"orbital_period_days":17.855182,"transit_midpoint_bjd":2454979.59635,"equilibrium_temperature_k":911,"argument_of_periastron_deg":228},"designations":[{"catalog":"Exoplanet","designation":"KOI-12 b"},{"catalog":"Host star","designation":"KOI-12"}],"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."}