{"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":"2026-09-07T23:26:21.345Z","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-350851","name":"HD 350851","class":"g5_yellow_star","category":"star","object_type":"G5 yellow star","mag":8.16,"mag_band":"V","abs_mag":1.798,"abs_mag_band":"V","distance_ly":610.7796761386589,"distance_method":"parallax","ra_deg":299.48654999999997,"dec_deg":20.540888,"epoch_ra_deg":299.781665,"epoch_dec_deg":20.612856,"epoch_moved_arcsec":0.273,"pm_ra_mas_yr":10.16,"pm_dec_mas_yr":1.07,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Sagitta","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-350851","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"19579+2032","age_years":502911900,"companions":[{"measured":2016,"magnitude":11.4,"components":"AB","discoverer_code":"BU  981","separation_arcsec":3,"position_angle_deg":107},{"measured":2015,"magnitude":12.12,"components":"AC","discoverer_code":"BU  981","separation_arcsec":30.3,"position_angle_deg":56}],"mass_solar":2.701,"radius_solar":10.46,"spectral_type":"G5","color_index_bv":1,"luminosity_solar":16.62646796893536,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1995A&AS..110..367N, quality E)","surface_gravity_log_g":2.781,"surface_temperature_k":4996,"proper_motion_ra_mas_yr":10.16,"proper_motion_dec_mas_yr":1.07,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":65.6327},"designations":[{"catalog":"HD","designation":"HD 350851"},{"catalog":"HIP","designation":"HIP 98255"}],"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."}