{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T17:28:45.196Z","years_from_j2000":26.673,"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-58661","name":"HD 58661","class":"b9iiipsr_blue_white_giant","category":"star","object_type":"B9IIIpSr blue-white giant","mag":5.7,"mag_band":"V","abs_mag":-0.225,"abs_mag_band":"V","distance_ly":499.47391989715453,"distance_method":"parallax","ra_deg":112.21452,"dec_deg":48.18393,"epoch_ra_deg":112.713799,"epoch_dec_deg":48.128599,"epoch_moved_arcsec":1.186,"pm_ra_mas_yr":-3.18,"pm_dec_mas_yr":-44.36,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Lynx","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-58661","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"07289+4811","companions":[{"measured":2015,"magnitude":9.87,"components":"AB","discoverer_code":"KUI  30","separation_arcsec":1.1,"position_angle_deg":96},{"measured":2017,"magnitude":10.2,"components":"AB,C","discoverer_code":"BU  758","separation_arcsec":16.4,"position_angle_deg":94}],"spectral_type":"B9IIIpSr","uncertainties":{"metallicity_fe_h":[0.124,0.124]},"color_index_bv":-0.092,"luminosity_solar":107.1519305237606,"metallicity_fe_h":-0.12,"radial_velocity_km_s":21,"spectral_type_source":"SIMBAD (1972ApJ...175..453M, quality C)","surface_gravity_log_g":3.75,"surface_temperature_k":13263,"metallicity_fe_h_source":"Median of 4 spectroscopic determinations in 4 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-3.18,"proper_motion_dec_mas_yr":-44.36,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 58661"},{"catalog":"HIP","designation":"HIP 36348"},{"catalog":"HR","designation":"HR 2844"}],"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."}