{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T15:29:04.294Z","years_from_j2000":26.678,"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-145991","name":"HD 145991","class":"k_orange_star","category":"star","object_type":"K orange star","mag":9.24,"mag_band":"V","abs_mag":4.874,"abs_mag_band":"V","distance_ly":243.5820629446846,"distance_method":"parallax","ra_deg":242.41374000000002,"dec_deg":65.829137,"epoch_ra_deg":242.467069,"epoch_dec_deg":65.756006,"epoch_moved_arcsec":7.333,"pm_ra_mas_yr":93.01,"pm_dec_mas_yr":-258.64,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Draco","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-145991","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16097+6550","age_years":8049645000,"companions":[{"measured":2016,"magnitude":18.96,"components":null,"discoverer_code":"LDS2369","separation_arcsec":28.8,"position_angle_deg":147}],"mass_solar":0.927,"radius_solar":0.967,"spectral_type":"K","color_index_bv":0.74,"luminosity_solar":0.978137704322986,"radial_velocity_km_s":-27.5,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":4.444,"surface_temperature_k":5579,"proper_motion_ra_mas_yr":93.01,"proper_motion_dec_mas_yr":-258.64,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.8141},"designations":[{"catalog":"HD","designation":"HD 145991"},{"catalog":"HIP","designation":"HIP 79180"}],"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."}