{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.653","julian_year":2026.653,"time":"2026-08-27T16:19:26.758Z","years_from_j2000":26.653,"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-22-b","name":"Kepler-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":634.8372967154237,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":289.2172051,"dec_deg":47.8841427,"epoch_ra_deg":289.404172,"epoch_dec_deg":47.931382,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-22","semi_major_axis_km":121473471.0084,"periapsis_km":null,"mass_kg":5.434672759690155e+25,"mass_msun":0.0000273318,"constellation":"Cygnus","discovered":"2011","featured":true,"url":"https://spacecatalog.org/object/kepler-22-b","radius_km":13394.010000000002,"radius_kind":null,"data_quality":null,"description":"The first habitable-zone planet confirmed by the Kepler mission, and still of unknown nature: too large to assume it is rocky, too small to assume it is not.","properties":{"host_star":"Kepler-22","host_v_mag":11.751,"uncertainties":{"radius_km":[765.3720000000001,765.3720000000001],"distance_ly":[2.9941155474397045,3.0234696214342116],"host_mass_solar":[0.043,0.051],"inclination_deg":[0.042,0.025],"host_radius_solar":[0.011,0.011],"host_temperature_k":[61,61],"semi_major_axis_km":[1944772.3190999997,1645576.5776999998],"orbital_period_days":[0.000013,0.000013]},"host_mass_solar":0.857,"inclination_deg":89.764,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.869,"planets_in_system":1,"discovery_facility":"Kepler","host_spectral_type":"G5 V","host_temperature_k":5596,"orbital_period_days":289.863876,"transit_midpoint_bjd":2454966.7001,"eccentricity_upper_limit":0.72,"equilibrium_temperature_k":279},"designations":[{"catalog":"Exoplanet","designation":"Kepler-22 b"},{"catalog":"Host star","designation":"Kepler-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":"2026-08-27T16:03:54.983Z","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."}