{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T18:44:24.063Z","years_from_j2000":26.684,"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-117207-b","name":"HD 117207 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":105.52691754111919,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":202.3368806,"dec_deg":-35.5713041,"epoch_ra_deg":202.720716,"epoch_dec_deg":-35.710356,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 117207","semi_major_axis_km":566527136.3409,"periapsis_km":null,"mass_kg":3.9974504070757095e+27,"mass_msun":0.00201038,"constellation":"Centaurus","discovered":"2004","featured":false,"url":"https://spacecatalog.org/object/hd-117207-b","radius_km":85466.54000000001,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 117207","host_v_mag":7.26,"eccentricity":0.157,"uncertainties":{"mass_kg":[1.6893308936043165e+26,3.036999359610753e+26],"distance_ly":[0.17025362916814007,0.17090594192357356],"eccentricity":[0.013,0.013],"host_mass_solar":[0.028,0.028],"inclination_deg":[12,9.3],"host_radius_solar":[0.041,0.041],"host_temperature_k":[53,53],"semi_major_axis_km":[5235925.4745000005,5086327.6038],"orbital_period_days":[8.53,8.37],"argument_of_periastron_deg":[5.523,5.275]},"host_mass_solar":1.053,"inclination_deg":76.6,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.074,"planets_in_system":1,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"G7 IV-V","host_temperature_k":5732,"orbital_period_days":2621.75,"periastron_epoch_bjd":2455978.9,"transit_midpoint_bjd":2453356,"equilibrium_temperature_k":147.2,"argument_of_periastron_deg":90.217},"designations":[{"catalog":"Exoplanet","designation":"HD 117207 b"},{"catalog":"Host star","designation":"HD 117207"}],"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."}