{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T06:19:10.396Z","years_from_j2000":26.669,"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":"k2-8-b","name":"K2-8 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":1316.0833844161627,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":169.7935178,"dec_deg":-0.2844389,"epoch_ra_deg":170.137344,"epoch_dec_deg":-0.43122,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-8","semi_major_axis_km":12805577.731919998,"periapsis_km":null,"mass_kg":7.465209834739224e+25,"mass_msun":0.0000375436,"constellation":"Leo","discovered":"2015","featured":false,"url":"https://spacecatalog.org/object/k2-8-b","radius_km":22833.598,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-8","host_v_mag":14.801,"uncertainties":{"radius_km":[4528.451,4528.451],"distance_ly":[38.06734162520971,38.06734162520971],"host_mass_solar":[0.04,0.04],"inclination_deg":[1.37,2.56],"host_radius_solar":[0.04,0.04],"host_temperature_k":[60,60],"semi_major_axis_km":[209437.01898,209437.01898],"orbital_period_days":[0.00086,0.00086]},"host_mass_solar":0.78,"inclination_deg":86.42,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.74,"planets_in_system":2,"discovery_facility":"K2","host_spectral_type":"K3 V","host_temperature_k":4870,"orbital_period_days":10.35239,"transit_midpoint_bjd":2456813.6114,"equilibrium_temperature_k":631},"designations":[{"catalog":"Exoplanet","designation":"K2-8 b"}],"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."}