{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.664","julian_year":2026.664,"time":"2026-08-31T12:59:55.001Z","years_from_j2000":26.664,"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-11-e","name":"Kepler-11 e","class":"neptune_like_planet","category":"exoplanet","object_type":"Neptune-like planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2108.0987011170623,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":297.1150949,"dec_deg":41.9091092,"epoch_ra_deg":297.33869,"epoch_dec_deg":41.975421,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-11","semi_major_axis_km":29171584.7865,"periapsis_km":null,"mass_kg":4.777734294233103e+25,"mass_msun":0.0000240279,"constellation":"Cygnus","discovered":"2010","featured":false,"url":"https://spacecatalog.org/object/kepler-11-e","radius_km":26724.239000000005,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-11","host_v_mag":13.817,"eccentricity":0.012,"uncertainties":{"mass_kg":[1.2541552522361896e+25,8.958251801687069e+24],"radius_km":[574.029,446.46700000000004],"distance_ly":[20.792469079442395,20.792469079442395],"eccentricity":[0.006,0.006],"host_mass_solar":[0.025,0.025],"inclination_deg":[0.02,0.02],"host_radius_solar":[0.022,0.017],"host_temperature_k":[66,55],"semi_major_axis_km":[299195.7414,299195.7414],"orbital_period_days":[0.0012,0.0008],"argument_of_periastron_deg":[3.24,3.23]},"host_mass_solar":0.961,"inclination_deg":88.89,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.065,"planets_in_system":6,"discovery_facility":"Kepler","host_temperature_k":5663,"orbital_period_days":31.9996,"transit_midpoint_bjd":2455595.0755,"equilibrium_temperature_k":582,"argument_of_periastron_deg":204.69},"designations":[{"catalog":"Exoplanet","designation":"Kepler-11 e"}],"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":"2026-08-30T09:56:50.739Z","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."}