{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T02:50:03.755Z","years_from_j2000":26.677,"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-25638","name":"HD 25638","class":"b0iii_blue_white_giant","category":"star","object_type":"B0III blue-white giant","mag":6.95,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":61.964145,"dec_deg":62.330102,"epoch_ra_deg":62.559025,"epoch_dec_deg":62.401705,"epoch_moved_arcsec":0.06,"pm_ra_mas_yr":0.13,"pm_dec_mas_yr":-2.25,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Camelopardalis","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-25638","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"04078+6220","companions":[{"measured":2022,"magnitude":12.9,"components":"AB","discoverer_code":"ES 2603","separation_arcsec":6.4,"position_angle_deg":255},{"measured":2022,"magnitude":13.5,"components":"AC","discoverer_code":"STF 485","separation_arcsec":11.2,"position_angle_deg":1},{"measured":2018,"magnitude":14.1,"components":"AD","discoverer_code":"STF 485","separation_arcsec":14.4,"position_angle_deg":131},{"measured":2022,"magnitude":6.94,"components":"AE","discoverer_code":"STF 485","separation_arcsec":17.9,"position_angle_deg":305},{"measured":2017,"magnitude":14.1,"components":"AS","discoverer_code":"FYM 353","separation_arcsec":20.1,"position_angle_deg":262},{"measured":2015,"magnitude":15.4,"components":"AT","discoverer_code":"FYM 353","separation_arcsec":27.5,"position_angle_deg":196},{"measured":2015,"magnitude":15.2,"components":"AU","discoverer_code":"FYM 353","separation_arcsec":35.3,"position_angle_deg":213},{"measured":2017,"magnitude":11.7,"components":"AF","discoverer_code":"STF 485","separation_arcsec":36.1,"position_angle_deg":320},{"measured":2017,"magnitude":13.2,"components":"AQ","discoverer_code":"WSI  20","separation_arcsec":45.4,"position_angle_deg":325},{"measured":2017,"magnitude":10.5,"components":"AH","discoverer_code":"STF 484","separation_arcsec":56.6,"position_angle_deg":256},{"measured":2017,"magnitude":9.63,"components":"AG","discoverer_code":"STF 484","separation_arcsec":59.9,"position_angle_deg":260},{"measured":2017,"magnitude":9.81,"components":"AI","discoverer_code":"STF 484","separation_arcsec":69.4,"position_angle_deg":279},{"measured":2017,"magnitude":9.8,"components":"AL","discoverer_code":"STF 485","separation_arcsec":98.1,"position_angle_deg":71},{"measured":2017,"magnitude":9.62,"components":"AN","discoverer_code":"HZG   2","separation_arcsec":115.9,"position_angle_deg":206},{"measured":2017,"magnitude":9.4,"components":"AO","discoverer_code":"STF 485","separation_arcsec":138.4,"position_angle_deg":78}],"spectral_type":"B0III","color_index_bv":0.386,"variable_mag_max":6.699,"variable_mag_min":7.249,"radial_velocity_km_s":-9,"spectral_type_source":"SIMBAD (quality C)","proper_motion_ra_mas_yr":0.13,"proper_motion_dec_mas_yr":-2.25},"designations":[{"catalog":"HD","designation":"HD 25638"},{"catalog":"HIP","designation":"HIP 19272"},{"catalog":"HR","designation":"HR 1260"}],"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."}