{"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":"2026-09-02T01:57:03.956Z","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-413-b","name":"Kepler-413 b","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":2764.2927174453785,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":288.5106679,"dec_deg":51.1624235,"epoch_ra_deg":288.677647,"epoch_dec_deg":51.207894,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-413","semi_major_axis_km":53152123.459709994,"periapsis_km":null,"mass_kg":4.001352471420224e+26,"mass_msun":0.000201234,"constellation":"Cygnus","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-413-b","radius_km":27725.600700000003,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-413","host_v_mag":15.885,"eccentricity":0.1181,"uncertainties":{"mass_kg":[1.2541552522361896e+26,1.3138769309141035e+26],"radius_km":[631.4319,631.4319],"distance_ly":[70.0062049131218,73.66894103488083],"eccentricity":[0.0017,0.0018],"host_mass_solar":[0.014,0.015],"inclination_deg":[0.016,0.024],"host_radius_solar":[0.0096,0.0088],"semi_major_axis_km":[269276.16725999996,299195.7414],"orbital_period_days":[0.021,0.024],"argument_of_periastron_deg":[2.3,2.2]},"host_mass_solar":0.82,"inclination_deg":89.929,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.7761,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":4700,"orbital_period_days":66.262,"transit_midpoint_bjd":2455096.64,"equilibrium_temperature_k":334.96,"argument_of_periastron_deg":94.6},"designations":[{"catalog":"Exoplanet","designation":"Kepler-413 b"},{"catalog":"Host star","designation":"Kepler-413"}],"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."}