{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T16:25:27.534Z","years_from_j2000":26.675,"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":"k2-22-b","name":"K2-22 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":795.2866651693985,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":169.4827046,"dec_deg":2.6190363,"epoch_ra_deg":169.828106,"epoch_dec_deg":2.472362,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-22","semi_major_axis_km":1346380.8362999998,"periapsis_km":null,"mass_kg":2.657387758788188e+27,"mass_msun":0.00133644,"constellation":"Leo","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/k2-22-b","radius_km":14669.63,"radius_kind":null,"data_quality":"The published mass and radius imply a density no material has. One of the two is likely an upper limit rather than a measurement.","description":null,"properties":{"host_star":"K2-22","host_v_mag":15.565,"eccentricity":0.19,"uncertainties":{"radius_km":[637.8100000000001,637.8100000000001],"distance_ly":[9.124224666625897,9.124224666625897],"eccentricity":[0.152914,0.221175],"host_mass_solar":[0.059529,0.059529],"inclination_deg":[7,8],"host_radius_solar":[0.03,0.03],"host_temperature_k":[90,90],"orbital_period_days":[0.000024,0.000024],"argument_of_periastron_deg":[144.3427,90.897]},"host_mass_solar":0.595292,"inclination_deg":90.6,"stars_in_system":2,"discovery_method":"Transit","host_radius_solar":0.58,"planets_in_system":1,"discovery_facility":"K2","host_spectral_type":"M0 V","host_temperature_k":3879,"orbital_period_days":0.381073,"transit_midpoint_bjd":2456846.94318,"equilibrium_temperature_k":2100,"argument_of_periastron_deg":46.7},"designations":[{"catalog":"Exoplanet","designation":"K2-22 b"},{"catalog":"Host star","designation":"K2-22"}],"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."}