{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-02T22:53:39.886Z","years_from_j2000":26.671,"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-808-b","name":"Kepler-808 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1046.9619724707463,"distance_method":"NASA Exoplanet Archive sy_dist (Morton+ 2016, 2016ApJ...822...86M)","ra_deg":291.5941514,"dec_deg":48.4454907,"epoch_ra_deg":291.780375,"epoch_dec_deg":48.498592,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-808","semi_major_axis_km":1965716.020998,"periapsis_km":null,"mass_kg":1.6304018279070464e+25,"mass_msun":0.00000819953,"constellation":"Cygnus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/kepler-808-b","radius_km":9312.026,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-808","host_v_mag":14.519,"eccentricity":0,"uncertainties":{"radius_km":[510.24800000000005,382.68600000000004],"distance_ly":[54.9540880814941,36.480590847617755],"host_mass_solar":[0.05,0.027],"host_radius_solar":[0.036,0.019],"host_temperature_k":[57.3,51.38],"semi_major_axis_km":[19447.723190999997,19447.723190999997],"orbital_period_days":[3.47e-7,3.47e-7]},"host_mass_solar":0.76,"inclination_deg":76.59,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.71,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":4653,"orbital_period_days":0.631332353,"transit_midpoint_bjd":2454966.944034,"equilibrium_temperature_k":1322},"designations":[{"catalog":"Exoplanet","designation":"Kepler-808 b"},{"catalog":"Host star","designation":"Kepler-808"}],"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."}