{"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":"2026-09-06T13:30:05.558Z","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-9773-b","name":"GJ 9773 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":51.927683052660434,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":333.1502333,"dec_deg":8.5503355,"epoch_ra_deg":333.483955,"epoch_dec_deg":8.682938,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"GJ 9773","semi_major_axis_km":436975380.31469995,"periapsis_km":null,"mass_kg":1.0306816576619272e+27,"mass_msun":0.000518345,"constellation":"Pegasus","discovered":"2025","featured":false,"url":"https://spacecatalog.org/object/gj-9773-b","radius_km":90569.02,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"GJ 9773","host_v_mag":12.033,"eccentricity":0.218,"uncertainties":{"mass_kg":[3.0369993584163196e+25,3.0369993584163196e+25],"distance_ly":[0.08202832899576097,0.08202832899576097],"eccentricity":[0.02,0.02],"host_mass_solar":[0.011,0.011],"host_radius_solar":[0.005,0.005],"host_temperature_k":[25,25],"semi_major_axis_km":[6731904.181499999,6731904.181499999],"orbital_period_days":[37,41],"argument_of_periastron_deg":[5.2,5.2]},"host_mass_solar":0.358,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.362,"planets_in_system":1,"discovery_facility":"Calar Alto Observatory","host_spectral_type":"M3.0 V","host_temperature_k":3528,"orbital_period_days":2965,"transit_midpoint_bjd":2459362,"equilibrium_temperature_k":59.89,"argument_of_periastron_deg":99},"designations":[{"catalog":"Exoplanet","designation":"GJ 9773 b"},{"catalog":"Host star","designation":"GJ 9773"}],"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."}