{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T16:47:31.715Z","years_from_j2000":26.681,"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-72945","name":"HD 72945","class":"f8v_yellow_white_main_sequence_star","category":"star","object_type":"F8V yellow-white main-sequence star","mag":5.91,"mag_band":"V","abs_mag":3.909,"abs_mag_band":"V","distance_ly":81.94874683959807,"distance_method":"parallax","ra_deg":128.96239500000001,"dec_deg":6.62022,"epoch_ra_deg":129.319139,"epoch_dec_deg":6.526621,"epoch_moved_arcsec":5.015,"pm_ra_mas_yr":-134.77,"pm_dec_mas_yr":-131,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cancer","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-72945","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"08358+0637","companions":[{"measured":2022,"magnitude":7.16,"components":"AB","discoverer_code":"STF1245","separation_arcsec":10.1,"position_angle_deg":25},{"measured":2015,"magnitude":14.6,"components":"AF","discoverer_code":"ANT   4","separation_arcsec":47.3,"position_angle_deg":72},{"measured":2020,"magnitude":10.7,"components":"AC","discoverer_code":"STF1245","separation_arcsec":99.8,"position_angle_deg":109},{"measured":2020,"magnitude":11.91,"components":"AD","discoverer_code":"STF1245","separation_arcsec":109.1,"position_angle_deg":292},{"measured":2020,"magnitude":9.6,"components":"AE","discoverer_code":"STF1245","separation_arcsec":113.2,"position_angle_deg":207},{"measured":2016,"magnitude":12.3,"components":"AG","discoverer_code":"ANT   4","separation_arcsec":120.5,"position_angle_deg":211}],"spectral_type":"F8V","uncertainties":{"metallicity_fe_h":[0.045,0.045]},"color_index_bv":0.53,"luminosity_solar":2.3790304458806246,"metallicity_fe_h":0.06,"radial_velocity_km_s":26.6,"spectral_type_source":"SIMBAD (2009ApJS..180..117A, quality C)","surface_gravity_log_g":4.58,"surface_temperature_k":6222,"metallicity_fe_h_source":"Median of 6 spectroscopic determinations in 7 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-134.77,"proper_motion_dec_mas_yr":-131,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Gliese","designation":"Gl 310.1A"},{"catalog":"HD","designation":"HD 72945"},{"catalog":"HIP","designation":"HIP 42172"},{"catalog":"HR","designation":"HR 3395"}],"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."}