{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-05T01:31:55.869Z","years_from_j2000":26.676,"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":"k2-226-b","name":"K2-226 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":689.054271383278,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":183.6456643,"dec_deg":-9.5626286,"epoch_ra_deg":183.991096,"epoch_dec_deg":-9.711973,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-226","semi_major_axis_km":6126032.805164999,"periapsis_km":null,"mass_kg":1.779706024601831e+25,"mass_msun":0.0000089504,"constellation":"Virgo","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/k2-226-b","radius_km":9815.851572205,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-226","host_v_mag":12.337,"eccentricity":0.22,"uncertainties":{"radius_km":[550.4883896150001,657.7263826220001],"distance_ly":[10.681621370223347,11.02082400304876],"eccentricity":[0.16,0.37],"host_mass_solar":[0.03,0.042],"inclination_deg":[1.1,1.5],"host_radius_solar":[0.032,0.034],"host_temperature_k":[99,99],"semi_major_axis_km":[73302.956643,98734.59466199999],"orbital_period_days":[0.00039,0.00036],"argument_of_periastron_deg":[130,99]},"host_mass_solar":0.856,"inclination_deg":87.6,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.889,"planets_in_system":1,"discovery_facility":"K2","host_temperature_k":5288,"orbital_period_days":3.27109,"transit_midpoint_bjd":2457620.0082,"equilibrium_temperature_k":1187,"argument_of_periastron_deg":-33},"designations":[{"catalog":"Exoplanet","designation":"K2-226 b"},{"catalog":"Host star","designation":"K2-226"}],"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."}