{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T11:40:19.837Z","years_from_j2000":26.683,"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":"k2-86-b","name":"K2-86 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":843.763287589438,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":51.5531053,"dec_deg":18.6355718,"epoch_ra_deg":51.936596,"epoch_dec_deg":18.729993,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-86","semi_major_axis_km":11519036.043899998,"periapsis_km":null,"mass_kg":2.6874755405061204e+25,"mass_msun":0.0000135157,"constellation":"Taurus","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/k2-86-b","radius_km":12501.076000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-86","host_v_mag":13.041,"uncertainties":{"radius_km":[1722.0870000000002,1722.0870000000002],"distance_ly":[9.579212813540753,9.797737586610973],"host_mass_solar":[0.08,0.08],"inclination_deg":[2.2274,1.04402],"host_radius_solar":[0.09,0.09],"host_temperature_k":[248,248],"semi_major_axis_km":[388954.46381999995,388954.46381999995],"orbital_period_days":[0.00098,0.00098]},"host_mass_solar":0.79,"inclination_deg":88.56037,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.76,"planets_in_system":1,"discovery_facility":"K2","host_temperature_k":5482,"orbital_period_days":8.77683,"transit_midpoint_bjd":2457070.0173,"equilibrium_temperature_k":830.49},"designations":[{"catalog":"Exoplanet","designation":"K2-86 b"},{"catalog":"Host star","designation":"K2-86"}],"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."}