{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T18:25:32.670Z","years_from_j2000":26.665,"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":"hr-8799-e","name":"HR 8799 e","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":134.52026258187138,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":346.8701486,"dec_deg":21.1340376,"epoch_ra_deg":347.200232,"epoch_dec_deg":21.279163,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HR 8799","semi_major_axis_km":2453405079.4799995,"periapsis_km":null,"mass_kg":1.898134113420134e+28,"mass_msun":0.00954599,"constellation":"Pegasus","discovered":"2010","featured":false,"url":"https://spacecatalog.org/object/hr-8799-e","radius_km":83645.78379300001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HR 8799","host_v_mag":5.98,"eccentricity":0.15,"uncertainties":{"mass_kg":[7.592536453680536e+27,1.3286938793940938e+28],"radius_km":[7864.133519000001,9293.975977000002],"distance_ly":[0.49086534846369884,0.49412691224086625],"eccentricity":[0.08,0.08],"host_mass_solar":[0.024,0.038],"inclination_deg":[8,8],"host_radius_solar":[0.050935,0.049341],"semi_major_axis_km":[164557657.77,314155528.46999997],"orbital_period_days":[1128.62,1128.62]},"host_mass_solar":1.51,"inclination_deg":25,"stars_in_system":1,"discovery_method":"Imaging","host_radius_solar":1.49338,"planets_in_system":4,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"A5","host_temperature_k":7400,"orbital_period_days":20815.6,"periastron_epoch_bjd":2449940,"equilibrium_temperature_k":1150},"designations":[{"catalog":"Exoplanet","designation":"HR 8799 e"}],"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":"2026-08-30T09:56:50.739Z","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."}