{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-06T01:31:16.440Z","years_from_j2000":26.679,"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":"pz-tel-b","name":"PZ Tel b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":153.50484685962985,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":283.2745823,"dec_deg":-50.1808952,"epoch_ra_deg":283.793697,"epoch_dec_deg":-50.148123,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"PZ Tel","semi_major_axis_km":4039142508.8999996,"periapsis_km":null,"mass_kg":5.1249364193431455e+28,"mass_msun":0.025774,"constellation":"Telescopium","discovered":"2023","featured":false,"url":"https://spacecatalog.org/object/pz-tel-b","radius_km":75899.39,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"PZ Tel","host_v_mag":8.43,"eccentricity":0.52,"uncertainties":{"mass_kg":[1.7083121397810487e+28,4.745311499391802e+28],"distance_ly":[0.4363972333850027,0.43933264078445333],"eccentricity":[0.1,0.08],"host_mass_solar":[0.13,0.15],"inclination_deg":[0.32,0.36],"host_radius_solar":[0.058267,0.093693],"host_temperature_k":[144.38,108.78],"semi_major_axis_km":[598391482.8,2094370189.7999997],"orbital_period_days":[10000,40000],"argument_of_periastron_deg":[30,50]},"host_mass_solar":1.36,"inclination_deg":91.73,"stars_in_system":1,"discovery_method":"Imaging","host_radius_solar":1.25646,"planets_in_system":1,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"G9 IV","host_temperature_k":5169,"orbital_period_days":44000,"periastron_epoch_bjd":2450500,"equilibrium_temperature_k":53.77,"argument_of_periastron_deg":50},"designations":[{"catalog":"Exoplanet","designation":"PZ Tel b"},{"catalog":"Host star","designation":"PZ Tel"}],"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."}