{"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":"2026-09-02T21:06:25.955Z","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":"k2-413-b","name":"K2-413 b","class":"terrestrial_planet","category":"exoplanet","object_type":"Terrestrial planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":930.0740498246198,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":353.4175668,"dec_deg":-7.6120272,"epoch_ra_deg":353.764102,"epoch_dec_deg":-7.463739,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-413","semi_major_axis_km":1750295.0871899999,"periapsis_km":null,"mass_kg":2.1678969360082705e+24,"mass_msun":0.00000109027,"constellation":"Aquarius","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/k2-413-b","radius_km":4846.7181900000005,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-413","host_v_mag":15.013,"uncertainties":{"radius_km":[316.35376,483.4599800000001],"distance_ly":[11.360026635874174,11.640521120710572],"host_mass_solar":[0.256,0.364],"inclination_deg":[6.1473,6.025],"host_radius_solar":[0.048,0.055],"host_temperature_k":[138,138],"semi_major_axis_km":[179517.44483999998,134638.08362999998],"orbital_period_days":[0.00003,0.00003]},"host_mass_solar":0.808,"inclination_deg":89.9518,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.7,"planets_in_system":2,"discovery_facility":"K2","host_temperature_k":4116,"orbital_period_days":0.8094,"transit_midpoint_bjd":2457738.6924,"equilibrium_temperature_k":1535.2},"designations":[{"catalog":"Exoplanet","designation":"K2-413 b"}],"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."}