{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T11:50:52.883Z","years_from_j2000":26.672,"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-383-c","name":"Kepler-383 c","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":1532.934975268694,"distance_method":"NASA Exoplanet Archive sy_dist (Morton+ 2016, 2016ApJ...822...86M)","ra_deg":291.3426078,"dec_deg":38.3631616,"epoch_ra_deg":291.575763,"epoch_dec_deg":38.415714,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-383","semi_major_axis_km":25730833.760399997,"periapsis_km":null,"mass_kg":1.2362387486328154e+25,"mass_msun":0.00000621722,"constellation":"Lyra","discovered":"2014","featured":false,"url":"https://spacecatalog.org/object/kepler-383-c","radius_km":7908.844,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-383","host_v_mag":15.473,"eccentricity":0,"uncertainties":{"radius_km":[3125.2690000000002,3125.2690000000002],"distance_ly":[93.26115464432561,74.79744210178077],"host_mass_solar":[0.017,0.017],"host_radius_solar":[0.265,0.265],"host_temperature_k":[200,200],"orbital_period_days":[0.000354,0.000354]},"host_mass_solar":0.669,"inclination_deg":89.04,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.672,"planets_in_system":2,"discovery_facility":"Kepler","host_temperature_k":4710,"orbital_period_days":31.200751,"transit_midpoint_bjd":2454973.07568,"equilibrium_temperature_k":406},"designations":[{"catalog":"Exoplanet","designation":"Kepler-383 c"},{"catalog":"Host star","designation":"Kepler-383"}],"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."}