{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T07:58:45.483Z","years_from_j2000":26.677,"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":"ic-4651-9122-b","name":"IC 4651 9122 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":2802.740031250628,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":261.2086139,"dec_deg":-49.9489317,"epoch_ra_deg":261.728342,"epoch_dec_deg":-49.973378,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"IC 4651 9122","semi_major_axis_km":304880460.4865999,"periapsis_km":null,"mass_kg":1.1958244914546844e+28,"mass_msun":0.00601397,"constellation":"Ara","discovered":"2018","featured":false,"url":"https://spacecatalog.org/object/ic-4651-9122-b","radius_km":81001.87,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"IC 4651 9122","host_v_mag":10.909,"eccentricity":0.18,"uncertainties":{"mass_kg":[9.49067056710067e+26,9.49067056710067e+26],"distance_ly":[104.33416366780905,104.33416366780905],"eccentricity":[0.09,0.09],"host_radius_solar":[0.680919,0.466403],"host_temperature_k":[35.15,35.15],"semi_major_axis_km":[5834316.9573,5834316.9573],"orbital_period_days":[8.1,8.1],"argument_of_periastron_deg":[60.7,60.7]},"host_mass_solar":2.1,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":10.267424,"planets_in_system":1,"discovery_facility":"La Silla Observatory","host_temperature_k":4740.1,"orbital_period_days":734,"periastron_epoch_bjd":2454605.6,"equilibrium_temperature_k":513.04,"argument_of_periastron_deg":118.5},"designations":[{"catalog":"Exoplanet","designation":"IC 4651 9122 b"},{"catalog":"Host star","designation":"IC 4651 9122"}],"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."}