{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T00:42:08.578Z","years_from_j2000":26.674,"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-52265-b","name":"HD 52265 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":97.78266050861282,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":105.0746449,"dec_deg":-5.3668142,"epoch_ra_deg":105.405065,"epoch_dec_deg":-5.403901,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 52265","semi_major_axis_km":77790892.764,"periapsis_km":null,"mass_kg":2.2967422772383621e+27,"mass_msun":0.00115506,"constellation":"Monoceros","discovered":"2000","featured":false,"url":"https://spacecatalog.org/object/hd-52265-b","radius_km":87379.97,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 52265","host_v_mag":6.29351,"eccentricity":0.27,"uncertainties":{"mass_kg":[9.490670567100671e+25,9.490670567100671e+25],"distance_ly":[0.13796414777418245,0.13829030415189922],"eccentricity":[0.02,0.02],"host_radius_solar":[0.02,0.02],"semi_major_axis_km":[1346380.8362999998,1346380.8362999998],"orbital_period_days":[0.02,0.02],"argument_of_periastron_deg":[3,3]},"host_mass_solar":1.204,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.32,"planets_in_system":1,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"G0V","host_temperature_k":6136,"orbital_period_days":119.27,"periastron_epoch_bjd":2451293.4,"transit_midpoint_bjd":2456393.46,"equilibrium_temperature_k":405,"argument_of_periastron_deg":242},"designations":[{"catalog":"Exoplanet","designation":"HD 52265 b"},{"catalog":"Host star","designation":"HD 52265"}],"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."}