{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T10:22:27.603Z","years_from_j2000":26.686,"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-199509-b","name":"HD 199509 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":79.27426454232078,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":317.3445632,"dec_deg":-82.0274926,"epoch_ra_deg":318.412489,"epoch_dec_deg":-81.918083,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 199509","semi_major_axis_km":63728692.91819999,"periapsis_km":null,"mass_kg":2.5814494555496967e+26,"mass_msun":0.000129825,"constellation":"Octans","discovered":"2022","featured":false,"url":"https://spacecatalog.org/object/hd-199509-b","radius_km":47389.283,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 199509","host_v_mag":6.98,"eccentricity":0.373,"uncertainties":{"mass_kg":[3.0369993584163196e+25,2.277749517319198e+25],"distance_ly":[0.06653590105421567,0.06653590105421567],"eccentricity":[0.087,0.09],"host_mass_solar":[0.136,0.136],"host_radius_solar":[0.03,0.03],"host_temperature_k":[96.14,117.02],"semi_major_axis_km":[2842359.5432999996,2692761.6725999997],"orbital_period_days":[0.0943,0.14198],"argument_of_periastron_deg":[12.411,15.866]},"host_mass_solar":1.04,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":0.92,"planets_in_system":1,"discovery_facility":"Multiple Observatories","host_spectral_type":"G3V","host_temperature_k":5796.02,"orbital_period_days":99.62167,"periastron_epoch_bjd":2444997.238,"equilibrium_temperature_k":410.73,"argument_of_periastron_deg":316.962},"designations":[{"catalog":"Exoplanet","designation":"HD 199509 b"},{"catalog":"Host star","designation":"HD 199509"}],"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."}