{"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":"2026-09-07T21:30:52.544Z","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-202696-b","name":"HD 202696 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":614.954803929811,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":319.2250346,"dec_deg":27.2582799,"epoch_ra_deg":319.518098,"epoch_dec_deg":27.370307,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 202696","semi_major_axis_km":234270265.51619998,"periapsis_km":null,"mass_kg":3.7886756903865876e+27,"mass_msun":0.00190538,"constellation":"Vulpecula","discovered":"2019","featured":false,"url":"https://spacecatalog.org/object/hd-202696-b","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 202696","host_v_mag":8.23,"eccentricity":0.011,"uncertainties":{"mass_kg":[1.8981341134201343e+26,4.175895049524295e+26],"distance_ly":[5.094562619935532,5.176101714364718],"eccentricity":[0.011,0.078],"host_mass_solar":[0.14,0.09],"host_radius_solar":[0.39,0.41],"host_temperature_k":[85,71],"semi_major_axis_km":[1047185.0948999999,2393565.9312],"orbital_period_days":[3.9,8.9],"argument_of_periastron_deg":[98.5,97.8]},"host_mass_solar":1.91,"inclination_deg":90,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":6.43,"planets_in_system":2,"discovery_facility":"W. M. Keck Observatory","host_spectral_type":"K0 III-IV","host_temperature_k":5040,"orbital_period_days":517.8,"equilibrium_temperature_k":492.46,"argument_of_periastron_deg":201.6},"designations":[{"catalog":"Exoplanet","designation":"HD 202696 b"},{"catalog":"Host star","designation":"HD 202696"}],"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."}