{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T15:18:55.574Z","years_from_j2000":26.683,"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-166724-b","name":"HD 166724 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":147.2080718314304,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":273.4988604,"dec_deg":-42.5757218,"epoch_ra_deg":273.98038,"epoch_dec_deg":-42.568264,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 166724","semi_major_axis_km":810820459.1939999,"periapsis_km":null,"mass_kg":7.212873479075538e+27,"mass_msun":0.00362746,"constellation":"Corona Australis","discovered":"2012","featured":false,"url":"https://spacecatalog.org/object/hd-166724-b","radius_km":82915.3,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 166724","host_v_mag":9.33,"eccentricity":0.734,"uncertainties":{"mass_kg":[5.504561339294489e+26,1.2337809898418685e+27],"distance_ly":[0.2932145835673523,0.2945192090782193],"eccentricity":[0.02,0.02],"host_mass_solar":[0.02,0.02],"inclination_deg":[16,15],"host_radius_solar":[0.015508,0.013056],"host_temperature_k":[52,52],"semi_major_axis_km":[64327084.40099999,64327084.40099999],"orbital_period_days":[467,705],"argument_of_periastron_deg":[3.6,3.6]},"host_mass_solar":0.81,"inclination_deg":68,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.797485,"planets_in_system":1,"discovery_facility":"La Silla Observatory","host_spectral_type":"K0 IV-V","host_temperature_k":5127,"orbital_period_days":5144,"periastron_epoch_bjd":2453212,"equilibrium_temperature_k":94.83,"argument_of_periastron_deg":202.3},"designations":[{"catalog":"Exoplanet","designation":"HD 166724 b"},{"catalog":"Host star","designation":"HD 166724"}],"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."}