{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T07:52:56.197Z","years_from_j2000":26.669,"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-197-c","name":"Kepler-197 c","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1078.1914456371246,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":295.2264739,"dec_deg":50.5592348,"epoch_ra_deg":295.404843,"epoch_dec_deg":50.621064,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-197","semi_major_axis_km":13463808.362999998,"periapsis_km":null,"mass_kg":3.1652489699294308e+25,"mass_msun":0.0000159185,"constellation":"Cygnus","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-197-c","radius_km":7845.063,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-197","host_v_mag":11.775,"eccentricity":0.08,"uncertainties":{"mass_kg":[1.7319286816595e+25,1.970815396371155e+25],"radius_km":[255.12400000000002,255.12400000000002],"distance_ly":[7.5407354528111075,7.645105493680465],"eccentricity":[0.08,0.21],"host_mass_solar":[0.019,0.023],"host_radius_solar":[0.033,0.033],"host_temperature_k":[102,102],"orbital_period_days":[0.000045,0.000045]},"host_mass_solar":0.857,"inclination_deg":83.51,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":1.12,"planets_in_system":4,"discovery_facility":"Kepler","host_temperature_k":6004,"orbital_period_days":10.349695,"transit_midpoint_bjd":2455007.06421,"equilibrium_temperature_k":930},"designations":[{"catalog":"Exoplanet","designation":"Kepler-197 c"},{"catalog":"Host star","designation":"Kepler-197"}],"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":"2026-09-01T22:58:55.274Z","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."}