{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.664","julian_year":2026.664,"time":"2026-08-31T14:57:13.084Z","years_from_j2000":26.664,"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-40501","name":"HD 40501","class":"f3iv_v_a_f_yellow_white_subgiant","category":"star","object_type":"F3IV/V+A/F yellow-white subgiant","mag":7.92,"mag_band":"V","abs_mag":0.298,"abs_mag_band":"V","distance_ly":1090.8241344588494,"distance_method":"parallax","ra_deg":89.618115,"dec_deg":-20.164791,"epoch_ra_deg":89.907314,"epoch_dec_deg":-20.161835,"epoch_moved_arcsec":0.363,"pm_ra_mas_yr":13.46,"pm_dec_mas_yr":1.94,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Lepus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-40501","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"05585-2010","companions":[{"measured":2021,"magnitude":8.88,"components":null,"discoverer_code":"S   504","separation_arcsec":3.6,"position_angle_deg":67}],"spectral_type":"F3IV/V+A/F","color_index_bv":0.364,"luminosity_solar":66.19116119411208,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality D)","surface_temperature_k":6922,"proper_motion_ra_mas_yr":13.46,"proper_motion_dec_mas_yr":1.94,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 40501"},{"catalog":"HIP","designation":"HIP 28275"}],"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."}