{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T05:51:33.059Z","years_from_j2000":26.674,"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-813-b","name":"Kepler-813 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":2739.713572820645,"distance_method":"NASA Exoplanet Archive sy_dist (Morton+ 2016, 2016ApJ...822...86M)","ra_deg":285.6626752,"dec_deg":48.4353251,"epoch_ra_deg":285.84368,"epoch_dec_deg":48.47371,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-813","semi_major_axis_km":21527133.59373,"periapsis_km":null,"mass_kg":3.1174716269870997e+25,"mass_msun":0.0000156782,"constellation":"Draco","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/kepler-813-b","radius_km":13649.134000000002,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-813","host_v_mag":14.646,"eccentricity":0,"uncertainties":{"radius_km":[1211.8390000000002,2678.802],"distance_ly":[237.93107754436434,344.0917169273871],"host_mass_solar":[0.07,0.049],"host_radius_solar":[0.076,0.117],"host_temperature_k":[59.41,69.68],"orbital_period_days":[0.00007455,0.00007455]},"host_mass_solar":0.95,"inclination_deg":87.58,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.93,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":5743,"orbital_period_days":19.12947337,"transit_midpoint_bjd":2454972.43468,"equilibrium_temperature_k":817},"designations":[{"catalog":"Exoplanet","designation":"Kepler-813 b"},{"catalog":"Host star","designation":"Kepler-813"}],"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."}