{"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":"2026-09-02T07:08:07.920Z","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":"k2-35-c","name":"K2-35 c","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":823.8579638573852,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":170.1031027,"dec_deg":1.2858679,"epoch_ra_deg":170.44769,"epoch_dec_deg":1.138935,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"K2-35","semi_major_axis_km":8227882.888499999,"periapsis_km":null,"mass_kg":2.615809526092624e+25,"mass_msun":0.0000131553,"constellation":"Leo","discovered":"2016","featured":false,"url":"https://spacecatalog.org/object/k2-35-c","radius_km":12309.733,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"K2-35","host_v_mag":14.166,"eccentricity":0.12,"uncertainties":{"radius_km":[701.591,829.153],"distance_ly":[7.956584834399955,7.956584834399955],"eccentricity":[0.096124,0.156754],"host_mass_solar":[0.070197,0.070197],"inclination_deg":[0.44,0.79],"host_radius_solar":[0.028268,0.028977],"host_temperature_k":[93.27,95.55],"semi_major_axis_km":[299195.7414,299195.7414],"orbital_period_days":[0.000338,0.000335],"argument_of_periastron_deg":[143.8159,94.4387]},"host_mass_solar":0.701968,"inclination_deg":88.58,"stars_in_system":1,"discovery_method":"Transit","host_radius_solar":0.619575,"planets_in_system":2,"discovery_facility":"K2","host_spectral_type":"K4 V","host_temperature_k":4402.71,"orbital_period_days":5.608352,"transit_midpoint_bjd":2456812.119,"equilibrium_temperature_k":766,"argument_of_periastron_deg":41.16},"designations":[{"catalog":"Exoplanet","designation":"K2-35 c"},{"catalog":"Host star","designation":"K2-35"}],"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."}