{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-09T01:45:05.376Z","years_from_j2000":26.687,"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-169830-b","name":"HD 169830 b","class":"gas_giant","category":"exoplanet","object_type":"Gas giant","mag":null,"mag_band":null,"abs_mag":null,"abs_mag_band":null,"distance_ly":122.65045352762591,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":276.9561859,"dec_deg":-29.8167919,"epoch_ra_deg":277.385702,"epoch_dec_deg":-29.80042,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":"HD 169830","semi_major_axis_km":114442371.08549999,"periapsis_km":null,"mass_kg":4.804153362002177e+27,"mass_msun":0.00241608,"constellation":"Sagittarius","discovered":"2000","featured":false,"url":"https://spacecatalog.org/object/hd-169830-b","radius_km":84190.92,"radius_kind":null,"data_quality":null,"description":null,"properties":{"host_star":"HD 169830","host_v_mag":5.9,"eccentricity":0.294,"uncertainties":{"mass_kg":[4.49855530148315e+26,4.251799103574498e+26],"distance_ly":[0.480428344376763,0.48401606453164725],"eccentricity":[0.011,0.012],"host_mass_solar":[0.158,0.158],"host_radius_solar":[0.04598,0.04598],"host_temperature_k":[50,50],"semi_major_axis_km":[5385523.345199999,4936729.7331],"orbital_period_days":[0.065,0.05685],"argument_of_periastron_deg":[2.12,1.748]},"host_mass_solar":1.17,"stars_in_system":1,"discovery_method":"Radial Velocity","host_radius_solar":1.935709,"planets_in_system":2,"discovery_facility":"La Silla Observatory","host_spectral_type":"F8 V","host_temperature_k":6300,"orbital_period_days":225.67372,"periastron_epoch_bjd":2451246.392,"transit_midpoint_bjd":2455515.75,"equilibrium_temperature_k":345,"argument_of_periastron_deg":147.743},"designations":[{"catalog":"Exoplanet","designation":"HD 169830 b"}],"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."}