{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T15:14:28.110Z","years_from_j2000":26.673,"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":"k2-59-b","name":"K2-59 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":1015.3672041613254,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":338.94255,"dec_deg":-14.027727,"epoch_ra_deg":339.300381,"epoch_dec_deg":-13.888868,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-59","semi_major_axis_km":20255551.692779996,"periapsis_km":null,"mass_kg":3.816215267518691e+25,"mass_msun":0.0000191923,"constellation":"Aquarius","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/k2-59-b","radius_km":15371.221000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-59","host_v_mag":14.266,"uncertainties":{"radius_km":[1977.211,1977.211],"distance_ly":[11.307841615439495,11.558982026281386],"host_mass_solar":[0.073,0.073],"host_radius_solar":[0.072,0.072],"host_temperature_k":[93,93],"semi_major_axis_km":[643270.84401,643270.84401],"orbital_period_days":[0.0033,0.0033]},"host_mass_solar":0.774,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.731,"planets_in_system":2,"discovery_facility":"K2","host_temperature_k":5055,"orbital_period_days":20.6921,"transit_midpoint_bjd":2456987.0603,"equilibrium_temperature_k":566.37},"designations":[{"catalog":"Exoplanet","designation":"K2-59 b"},{"catalog":"Host star","designation":"K2-59"}],"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."}