{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T06:42:58.431Z","years_from_j2000":26.666,"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":"hs-psc-b","name":"HS Psc b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":122.83179647363644,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":24.347379,"dec_deg":26.9528036,"epoch_ra_deg":24.721934,"epoch_dec_deg":27.089731,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HS Psc","semi_major_axis_km":6507507.375449999,"periapsis_km":null,"mass_kg":2.771261915644812e+27,"mass_msun":0.00139371,"constellation":"Pisces","discovered":"2024","featured":false,"url":"https://spacecatalog.org/object/hs-psc-b","radius_km":86742.16,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HS Psc","host_v_mag":10.769,"eccentricity":0.27,"uncertainties":{"mass_kg":[8.351748238929571e+26,1.0629497758637636e+27],"distance_ly":[0.32256865756185926,0.3245255958281597],"eccentricity":[0.27,0.21],"host_mass_solar":[0.07,0.07],"host_radius_solar":[0.07,0.07],"host_temperature_k":[116,116],"semi_major_axis_km":[254316.38018999997,254316.38018999997],"orbital_period_days":[0.003,0.044],"argument_of_periastron_deg":[102.74,101.88]},"host_mass_solar":0.69,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.65,"planets_in_system":1,"discovery_facility":"McDonald Observatory","host_spectral_type":"K7 V","host_temperature_k":4203,"orbital_period_days":3.986,"periastron_epoch_bjd":2458486.71,"transit_midpoint_bjd":2458486.422,"equilibrium_temperature_k":783.44,"argument_of_periastron_deg":176.25},"designations":[{"catalog":"Exoplanet","designation":"HS Psc b"},{"catalog":"Host star","designation":"HS Psc"}],"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."}