{"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":"2026-09-01T11:31:37.054Z","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":"hip-101425","name":"HIP 101425","class":"o6ib_fc_o4_5_iii_fc_blue_supergiant","category":"star","object_type":"O6Ib(fc)+O4.5:III:(fc) blue supergiant","mag":8.69,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":308.312835,"dec_deg":41.314026,"epoch_ra_deg":308.552467,"epoch_dec_deg":41.405086,"epoch_moved_arcsec":0.112,"pm_ra_mas_yr":-1.16,"pm_dec_mas_yr":-4.05,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cygnus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-101425","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20333+4119","companions":[{"measured":2010,"magnitude":14,"components":"Aa,Ab","discoverer_code":"HER   4","separation_arcsec":0.2,"position_angle_deg":245},{"measured":2018,"magnitude":14,"components":"Aa,Ac","discoverer_code":"HER   4","separation_arcsec":3.1,"position_angle_deg":340},{"measured":2021,"magnitude":10.8,"components":"AB","discoverer_code":"HJ 1539","separation_arcsec":9.5,"position_angle_deg":202},{"measured":2021,"magnitude":11.8,"components":"AD","discoverer_code":"HJ 1539","separation_arcsec":18,"position_angle_deg":52},{"measured":2015,"magnitude":10.14,"components":"AC","discoverer_code":"ARN  77","separation_arcsec":38,"position_angle_deg":121}],"spectral_type":"O6Ib(fc)+O4.5:III:(fc)","color_index_bv":1.071,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (2014ApJS..211...10S, quality C)","proper_motion_ra_mas_yr":-1.16,"proper_motion_dec_mas_yr":-4.05},"designations":[{"catalog":"HIP","designation":"HIP 101425"}],"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."}