{"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":"2026-09-05T20:35:41.117Z","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":"hip-948-b","name":"HIP 948 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":113.67299923097256,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":2.9276336,"dec_deg":-39.2304879,"epoch_ra_deg":3.267087,"epoch_dec_deg":-39.08104,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HIP 948","semi_major_axis_km":2249503181.7159,"periapsis_km":null,"mass_kg":3.910136675498844e+28,"mass_msun":0.0196646,"constellation":"Sculptor","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/hip-948-b","radius_km":77175.01000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HIP 948","host_v_mag":9.92,"eccentricity":0.23,"uncertainties":{"mass_kg":[1.615873471772299e+28,1.8707916055190296e+28],"distance_ly":[0.18949685545342793,0.18982301183114467],"eccentricity":[0.11,0.161],"host_mass_solar":[0.08,0.08],"inclination_deg":[22.006,7.363],"host_radius_solar":[0.050659,0.062427],"host_temperature_k":[137.15,117.06],"semi_major_axis_km":[667804894.8048,495916941.37049997],"orbital_period_days":[10015.46337,8914.75178],"argument_of_periastron_deg":[17.596,27.759]},"host_mass_solar":0.71,"inclination_deg":110.998,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.688488,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_temperature_k":4497,"orbital_period_days":24955.45756,"periastron_epoch_bjd":2446439.434,"equilibrium_temperature_k":46.4,"argument_of_periastron_deg":117.432},"designations":[{"catalog":"Exoplanet","designation":"HIP 948 b"},{"catalog":"Host star","designation":"HIP 948"}],"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."}