{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T11:07:51.191Z","years_from_j2000":26.667,"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-101108","name":"HD 101108","class":"a5_lb_white_star","category":"star","object_type":"A5_lB white star","mag":8.83,"mag_band":"V","abs_mag":2.285,"abs_mag_band":"V","distance_ly":664.2696482405827,"distance_method":"parallax","ra_deg":174.580695,"dec_deg":38.754688,"epoch_ra_deg":174.937402,"epoch_dec_deg":38.60611,"epoch_moved_arcsec":0.222,"pm_ra_mas_yr":-5.48,"pm_dec_mas_yr":6.27,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ursa Major","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-101108","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"11383+3845","companions":[{"measured":2021,"magnitude":11.86,"components":null,"discoverer_code":"ES  306","separation_arcsec":7,"position_angle_deg":342}],"spectral_type":"A5_lB","color_index_bv":0.188,"luminosity_solar":10.616955571987242,"radial_velocity_km_s":-22,"spectral_type_source":"SIMBAD (1968AJ.....73..152S, quality D)","proper_motion_ra_mas_yr":-5.48,"proper_motion_dec_mas_yr":6.27},"designations":[{"catalog":"HD","designation":"HD 101108"},{"catalog":"HIP","designation":"HIP 56768"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}