{"id":17613,"slug":"charon","name":"Charon","domain":"solar-system","class":"moon","otype":null,"otype_label":"Natural satellite","ra":null,"dec":null,"coo_err_mas":null,"coo_bibcode":null,"plx_mas":null,"pmra":null,"pmdec":null,"rv_kms":null,"redshift":null,"dist_pc":null,"vmag":null,"bmag":null,"gmag":null,"jmag":null,"kmag":null,"sp_type":null,"morph_type":null,"size_maj":null,"size_min":null,"size_angle":null,"nbref":0,"simbad_oid":null,"gaia_dr3":null,"jpl_spkid":null,"ned_name":null,"exo_name":null,"host_object_id":null,"depth":1,"deep_at":"2026-08-14T16:44:00.521972+00:00","views":4,"first_seen":"2026-08-14T16:33:43.823886+00:00","updated_at":"2026-08-14T16:33:43.823886+00:00","identifiers":["Horizons 901","PI"],"measurements":[{"parameter":"density","value":1.853,"value_text":"1.853 +- 0.004","unit":"g cm^-3","err_plus":null,"err_minus":null,"band":null,"method":"Density (g cm^-3)","source":"horizons","reference":"JPL Horizons on-line ephemeris system","ref_year":null},{"parameter":"jpl:eccentricity_e","value":0.0,"value_text":"0.000","unit":"e","err_plus":null,"err_minus":null,"band":null,"method":"Eccentricity, e","source":"horizons","reference":"JPL Horizons on-line ephemeris system","ref_year":null},{"parameter":"jpl:inclination_deg","value":0.0,"value_text":"0.0","unit":"deg.","err_plus":null,"err_minus":null,"band":null,"method":"Inclination, deg.","source":"horizons","reference":"JPL Horizons on-line ephemeris system","ref_year":null},{"parameter":"jpl:radius_km_iau2015","value":606.0,"value_text":"606 +- 0.5","unit":null,"err_plus":null,"err_minus":null,"band":null,"method":"Radius (km, IAU2015)","source":"horizons","reference":"JPL Horizons on-line ephemeris system","ref_year":null},{"parameter":"jpl:semi_major_axis_a_km","value":19600.0,"value_text":"19600.","unit":"km","err_plus":null,"err_minus":null,"band":null,"method":"Semi-major axis, a (km)","source":"horizons","reference":"JPL Horizons on-line ephemeris system","ref_year":null},{"parameter":"orbital_period","value":6.387222,"value_text":"6.387222","unit":"days","err_plus":null,"err_minus":null,"band":null,"method":"Orbital period, days","source":"horizons","reference":"JPL Horizons on-line ephemeris system","ref_year":null}],"orbit":null,"exoplanet":null,"sources":[{"source":"horizons","url":"https://ssd.jpl.nasa.gov/horizons/app.html#/?sstr=901","fetched_at":"2026-08-14T17:11:43.321005+00:00"}]}