{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T22:41:22.825Z","years_from_j2000":26.684,"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-100922","name":"HD 100922","class":"k0_1v_orange_dwarf","category":"star","object_type":"K0/1V orange dwarf","mag":8.86,"mag_band":"V","abs_mag":5.445,"abs_mag_band":"V","distance_ly":157.18389080027472,"distance_method":"parallax","ra_deg":174.207705,"dec_deg":-12.35064,"epoch_ra_deg":174.548348,"epoch_dec_deg":-12.49961,"epoch_moved_arcsec":1.233,"pm_ra_mas_yr":13.57,"pm_dec_mas_yr":-44.18,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Crater","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-100922","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"11368-1221","companions":[{"measured":2022,"magnitude":9.73,"components":"AB","discoverer_code":"BU  456","separation_arcsec":1.1,"position_angle_deg":165},{"measured":2016,"magnitude":14.6,"components":"AC","discoverer_code":"KPP4375","separation_arcsec":3.7,"position_angle_deg":290},{"measured":2015,"magnitude":14.6,"components":"BC","discoverer_code":"KPP4375","separation_arcsec":4.2,"position_angle_deg":298}],"radius_solar":0.764,"spectral_type":"K0/1V","color_index_bv":0.804,"luminosity_solar":0.5780960474057177,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality D)","surface_gravity_log_g":4.548,"surface_temperature_k":5256,"proper_motion_ra_mas_yr":13.57,"proper_motion_dec_mas_yr":-44.18,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.3751},"designations":[{"catalog":"HD","designation":"HD 100922"},{"catalog":"HIP","designation":"HIP 56641"}],"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."}