{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T17:57:42.792Z","years_from_j2000":26.681,"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":"gj-3323-c","name":"GJ 3323 c","class":"super_earth","category":"exoplanet","object_type":"Super-Earth","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":17.530383452070613,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":75.4868824,"dec_deg":-6.9485133,"epoch_ra_deg":75.813562,"epoch_dec_deg":-6.909223,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 3323","semi_major_axis_km":18909170.85648,"periapsis_km":null,"mass_kg":1.3795707774598087e+25,"mass_msun":0.00000693806,"constellation":"Eridanus","discovered":"2017","featured":false,"url":"https://spacecatalog.org/object/gj-3323-c","radius_km":8419.092,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 3323","host_v_mag":12.57,"eccentricity":0.17,"uncertainties":{"mass_kg":[2.926362255217776e+24,2.9860839338956896e+24],"distance_ly":[0.005609889696727987,0.005609889696727987],"eccentricity":[0.12,0.21],"host_radius_solar":[0.027,0.027],"host_temperature_k":[49,49],"semi_major_axis_km":[329115.31554,314155.52846999996],"orbital_period_days":[0.19,0.21]},"host_mass_solar":0.164,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.119,"planets_in_system":2,"discovery_facility":"La Silla Observatory","host_spectral_type":"M4","host_temperature_k":3159,"orbital_period_days":40.54,"equilibrium_temperature_k":147.8},"designations":[{"catalog":"Exoplanet","designation":"GJ 3323 c"}],"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."}