{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T04:15:53.479Z","years_from_j2000":26.674,"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-17652","name":"β For","class":"g9iiib_yellow_giant","category":"star","object_type":"G9IIIb yellow giant","mag":4.45,"mag_band":"V","abs_mag":0.831,"abs_mag_band":"V","distance_ly":172.66098939206734,"distance_method":"parallax","ra_deg":42.272535000000005,"dec_deg":-32.405898,"epoch_ra_deg":42.554584,"epoch_dec_deg":-32.292797,"epoch_moved_arcsec":4.833,"pm_ra_mas_yr":86.96,"pm_dec_mas_yr":158.96,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Fornax","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-17652","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"02491-3224","companions":[{"measured":1928,"magnitude":14,"components":"AB","discoverer_code":"B  1031","separation_arcsec":4.8,"position_angle_deg":67},{"measured":2022,"magnitude":13.2,"components":"AC","discoverer_code":"DAM1389","separation_arcsec":19.3,"position_angle_deg":208}],"spectral_type":"G9IIIb","uncertainties":{"metallicity_fe_h":[0.067,0.067]},"color_index_bv":0.981,"luminosity_solar":40.513522022926395,"metallicity_fe_h":-0.355,"radial_velocity_km_s":17,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality B)","surface_gravity_log_g":2.63,"surface_temperature_k":4805,"metallicity_fe_h_source":"Median of 4 spectroscopic determinations in 6 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":86.96,"proper_motion_dec_mas_yr":158.96,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"Beta For"},{"catalog":"HD","designation":"HD 17652"},{"catalog":"HIP","designation":"HIP 13147"},{"catalog":"HR","designation":"HR 841"}],"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."}