{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T08:54:14.143Z","years_from_j2000":26.685,"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-3222-b","name":"GJ 3222 b","class":"neptune_like_planet","category":"exoplanet","object_type":"Neptune-like planet","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":59.484954633821786,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":50.8972464,"dec_deg":-40.0762325,"epoch_ra_deg":51.14508,"epoch_dec_deg":-39.980335,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 3222","semi_major_axis_km":13613406.233699998,"periapsis_km":null,"mass_kg":6.833248557929761e+25,"mass_msun":0.0000343654,"constellation":"Eridanus","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/gj-3222-b","radius_km":21685.54,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 3222","host_v_mag":6.9,"eccentricity":0.929,"uncertainties":{"mass_kg":[1.138874758659599e+25,2.087937061524043e+25],"eccentricity":[0.08,0.042],"host_mass_solar":[0.114,0.114],"semi_major_axis_km":[598391.4828,598391.4828],"orbital_period_days":[0.00231,0.00285],"argument_of_periastron_deg":[27.775,24.72]},"host_mass_solar":0.89,"stars_in_system":2,"discovery_method":"Radial Velocity","host_radius_solar":0.931389,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_spectral_type":"K0V","host_temperature_k":5257.46,"orbital_period_days":10.66669,"periastron_epoch_bjd":2456563.978,"equilibrium_temperature_k":811.06,"argument_of_periastron_deg":290.895},"designations":[{"catalog":"Exoplanet","designation":"GJ 3222 b"},{"catalog":"Host star","designation":"GJ 3222"}],"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."}