{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T15:00:50.661Z","years_from_j2000":26.681,"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-105953","name":"HD 105953","class":"g8iii_yellow_giant","category":"star","object_type":"G8III yellow giant","mag":7.67,"mag_band":"V","abs_mag":-0.384,"abs_mag_band":"V","distance_ly":1331.2506344491246,"distance_method":"parallax","ra_deg":182.924655,"dec_deg":-30.603804,"epoch_ra_deg":183.272085,"epoch_dec_deg":-30.753376,"epoch_moved_arcsec":0.78,"pm_ra_mas_yr":-25.56,"pm_dec_mas_yr":-14.22,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Hydra","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-105953","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"12117-3036","companions":[{"measured":2017,"magnitude":10.75,"components":"AB","discoverer_code":"HJ 4505","separation_arcsec":10.1,"position_angle_deg":276},{"measured":2017,"magnitude":12.61,"components":"AC","discoverer_code":"KNP   2","separation_arcsec":37.3,"position_angle_deg":116}],"spectral_type":"G8III","color_index_bv":0.962,"luminosity_solar":124.05092300422251,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1982MSS...C03....0H, quality C)","proper_motion_ra_mas_yr":-25.56,"proper_motion_dec_mas_yr":-14.22},"designations":[{"catalog":"HD","designation":"HD 105953"},{"catalog":"HIP","designation":"HIP 59456"}],"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."}