{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-02T01:12:19.448Z","years_from_j2000":26.668,"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-99-b","name":"Kepler-99 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":679.6087826846011,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":297.3539994,"dec_deg":41.3000452,"epoch_ra_deg":297.580414,"epoch_dec_deg":41.366936,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-99","semi_major_axis_km":7586108.023196999,"periapsis_km":null,"mass_kg":3.6728832386916983e+25,"mass_msun":0.0000184715,"constellation":"Cygnus","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-99-b","radius_km":9439.588,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-99","host_v_mag":13.206,"eccentricity":0,"uncertainties":{"mass_kg":[7.763818228128793e+24,7.763818228128793e+24],"radius_km":[510.24800000000005,510.24800000000005],"distance_ly":[3.3626722542596243,3.3985494558084666],"host_mass_solar":[0.06,0.06],"host_radius_solar":[0.04,0.04],"host_temperature_k":[129,129],"semi_major_axis_km":[35903.488968,35903.488968]},"host_mass_solar":0.79,"inclination_deg":89.05,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.73,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":4782,"orbital_period_days":4.60358,"transit_midpoint_bjd":2455004.83893,"equilibrium_temperature_k":810},"designations":[{"catalog":"Exoplanet","designation":"Kepler-99 b"},{"catalog":"Host star","designation":"Kepler-99"}],"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."}