{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T00:08:30.964Z","years_from_j2000":26.682,"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":"hd-125271-b","name":"HD 125271 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":128.33144531469617,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":216.6474037,"dec_deg":-81.4542756,"epoch_ra_deg":217.584326,"epoch_dec_deg":-81.574932,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 125271","semi_major_axis_km":1618200167.3618999,"periapsis_km":null,"mass_kg":2.0697150635759225e+28,"mass_msun":0.0104089,"constellation":"Apus","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/hd-125271-b","radius_km":79088.44,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 125271","host_v_mag":9.68,"eccentricity":0.165,"uncertainties":{"mass_kg":[2.378350123489199e+27,3.560881749131663e+27],"distance_ly":[0.21852477307021811,0.21917708582565157],"eccentricity":[0.061,0.066],"host_mass_solar":[0.089,0.089],"inclination_deg":[14.447,12.161],"host_radius_solar":[0.050699,0.050728],"host_temperature_k":[112.82,117.5],"semi_major_axis_km":[234120667.64549997,262843458.81989998],"orbital_period_days":[3025.64091,3707.63683],"argument_of_periastron_deg":[37.86,35.742]},"host_mass_solar":0.75,"inclination_deg":93.088,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.751364,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_temperature_k":4703.93,"orbital_period_days":14901.99295,"periastron_epoch_bjd":2451853.215,"equilibrium_temperature_k":59.78,"argument_of_periastron_deg":164.716},"designations":[{"catalog":"Exoplanet","designation":"HD 125271 b"},{"catalog":"Host star","designation":"HD 125271"}],"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."}