{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T08:32:03.399Z","years_from_j2000":26.666,"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-8765","name":"HD 8765","class":"g6v_yellow_main_sequence_star","category":"star","object_type":"G6V yellow main-sequence star","mag":8.14,"mag_band":"V","abs_mag":4.52,"abs_mag_band":"V","distance_ly":172.75231317782803,"distance_method":"parallax","ra_deg":21.580035,"dec_deg":-4.674109,"epoch_ra_deg":21.919007,"epoch_dec_deg":-4.535198,"epoch_moved_arcsec":3.789,"pm_ra_mas_yr":-97.03,"pm_dec_mas_yr":-103.81,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cetus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-8765","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"01263-0440","companions":[{"measured":2023,"magnitude":10,"components":"Aa,Ab","discoverer_code":"TOK 204","separation_arcsec":0.1,"position_angle_deg":7},{"measured":2015,"magnitude":17.5,"components":"AB","discoverer_code":"TOK 204","separation_arcsec":24.6,"position_angle_deg":227}],"spectral_type":"G6V","uncertainties":{"metallicity_fe_h":[0.01,0.01]},"color_index_bv":0.707,"luminosity_solar":1.3551894123510362,"metallicity_fe_h":0.185,"radial_velocity_km_s":-22,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_gravity_log_g":4.3,"surface_temperature_k":5650,"metallicity_fe_h_source":"Median of 2 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":-97.03,"proper_motion_dec_mas_yr":-103.81,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 8765"},{"catalog":"HIP","designation":"HIP 6712"}],"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."}