{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-02T02:59:56.641Z","years_from_j2000":26.668,"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-522-b","name":"Kepler-522 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2084.9187673527335,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":288.153973,"dec_deg":44.0688154,"epoch_ra_deg":288.35976,"epoch_dec_deg":44.113447,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"Kepler-522","semi_major_axis_km":37442851.057503,"periapsis_km":null,"mass_kg":2.281368125496307e+26,"mass_msun":0.000114733,"constellation":"Lyra","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/kepler-522-b","radius_km":44072.671,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"Kepler-522","host_v_mag":12.22,"eccentricity":0,"uncertainties":{"radius_km":[7717.501,9567.150000000001],"distance_ly":[32.91896320295091,33.975709866753164],"host_mass_solar":[0.109,0.141],"host_radius_solar":[0.346,0.431],"host_temperature_k":[64.51,72.53],"semi_major_axis_km":[176525.487426,176525.487426],"orbital_period_days":[0.00004568,0.00004568]},"host_mass_solar":1.54,"inclination_deg":85.76,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":1.98,"planets_in_system":1,"discovery_facility":"Kepler","host_temperature_k":6392,"orbital_period_days":38.58422849,"transit_midpoint_bjd":2455007.833446,"equilibrium_temperature_k":761},"designations":[{"catalog":"Exoplanet","designation":"Kepler-522 b"},{"catalog":"Host star","designation":"Kepler-522"}],"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":"2026-09-01T22:58:55.274Z","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."}