{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T20:28:48.570Z","years_from_j2000":26.67,"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-167263","name":"16 Sgr","class":"o9_5iii_blue_giant","category":"star","object_type":"O9.5III blue giant","mag":5.96,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":273.804045,"dec_deg":-20.387974,"epoch_ra_deg":274.203558,"epoch_dec_deg":-20.379847,"epoch_moved_arcsec":0.091,"pm_ra_mas_yr":2.83,"pm_dec_mas_yr":-1.9,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Sagittarius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-167263","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"18152-2023","companions":[{"measured":2023,"magnitude":6.9,"components":"Aa,Ab","discoverer_code":"CHR 255","separation_arcsec":0.1,"position_angle_deg":161},{"measured":2012,"magnitude":13.43,"components":"AC","discoverer_code":"SNA  83","separation_arcsec":5.9,"position_angle_deg":27},{"measured":2015,"magnitude":13,"components":"AB","discoverer_code":"BU  286","separation_arcsec":6.1,"position_angle_deg":216},{"measured":2012,"magnitude":13.04,"components":"AD","discoverer_code":"SNA  83","separation_arcsec":6.5,"position_angle_deg":281},{"measured":2012,"magnitude":13.2,"components":"AE","discoverer_code":"SNA  83","separation_arcsec":7.3,"position_angle_deg":242}],"spectral_type":"O9.5III","color_index_bv":-0.023,"radial_velocity_km_s":-5,"spectral_type_source":"SIMBAD (2014ApJS..211...10S, quality C)","proper_motion_ra_mas_yr":2.83,"proper_motion_dec_mas_yr":-1.9},"designations":[{"catalog":"Bayer/Flamsteed","designation":"16 Sgr"},{"catalog":"HD","designation":"HD 167263"},{"catalog":"HIP","designation":"HIP 89440"},{"catalog":"HR","designation":"HR 6823"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"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."}