{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T17:04:59.011Z","years_from_j2000":26.67,"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":"k2-68-b","name":"K2-68 b","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":550.069254146842,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":334.0195539,"dec_deg":-10.5673649,"epoch_ra_deg":334.376016,"epoch_dec_deg":-10.433793,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-68","semi_major_axis_km":10591529.24556,"periapsis_km":null,"mass_kg":1.8633163747509103e+25,"mass_msun":0.00000937089,"constellation":"Aquarius","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/k2-68-b","radius_km":10077.398000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-68","host_v_mag":12.987,"uncertainties":{"radius_km":[1466.9630000000002,1466.9630000000002],"distance_ly":[4.0443390836876185,4.103047231676633],"host_mass_solar":[0.096,0.096],"inclination_deg":[1.33274,0.90609],"host_radius_solar":[0.086,0.086],"host_temperature_k":[96,96],"semi_major_axis_km":[463753.39916999993,463753.39916999993],"orbital_period_days":[0.00082,0.00082]},"host_mass_solar":0.73,"inclination_deg":88.71527,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.675,"planets_in_system":1,"discovery_facility":"K2","host_temperature_k":4746,"orbital_period_days":8.05428,"transit_midpoint_bjd":2456982.3281,"equilibrium_temperature_k":706.64},"designations":[{"catalog":"Exoplanet","designation":"K2-68 b"},{"catalog":"Host star","designation":"K2-68"}],"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."}