{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T13:39:38.668Z","years_from_j2000":26.67,"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-d","name":"Kepler-11 d","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":297.338728,"epoch_dec_deg":41.975447,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-11","semi_major_axis_km":23187669.958499998,"periapsis_km":null,"mass_kg":4.359682543487707e+25,"mass_msun":0.0000219255,"constellation":"Cygnus","discovered":"2010","featured":false,"url":"https://spacecatalog.org/object/kepler-11-d","radius_km":19899.672000000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-11","host_v_mag":13.817,"eccentricity":0.004,"uncertainties":{"mass_kg":[8.958251801687069e+24,4.7777342942331034e+24],"radius_km":[446.46700000000004,382.68600000000004],"distance_ly":[20.792469079442395,20.792469079442395],"eccentricity":[0.002,0.007],"host_mass_solar":[0.025,0.025],"inclination_deg":[0.16,0.13],"host_radius_solar":[0.022,0.017],"host_temperature_k":[66,55],"semi_major_axis_km":[149597.8707,149597.8707],"orbital_period_days":[0.0009,0.0009],"argument_of_periastron_deg":[24.38,24.37]},"host_mass_solar":0.961,"inclination_deg":89.67,"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":22.6845,"transit_midpoint_bjd":2455594.0069,"equilibrium_temperature_k":653,"argument_of_periastron_deg":102.52},"designations":[{"catalog":"Exoplanet","designation":"Kepler-11 d"},{"catalog":"Host star","designation":"Kepler-11"}],"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."}