{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-01T19:41:00.866Z","years_from_j2000":26.668,"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-35929","name":"HD 35929","class":"f2iv_v_yellow_white_subgiant","category":"star","object_type":"F2IV/V yellow-white subgiant","mag":8.11,"mag_band":"V","abs_mag":0.33,"abs_mag_band":"V","distance_ly":1173.2242817252074,"distance_method":"parallax","ra_deg":81.92829,"dec_deg":-8.327346,"epoch_ra_deg":82.250687,"epoch_dec_deg":-8.304519,"epoch_moved_arcsec":0.122,"pm_ra_mas_yr":-0.25,"pm_dec_mas_yr":-4.57,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Orion","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-35929","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"F2IV/V","uncertainties":{"metallicity_fe_h":[0.41,0.41]},"color_index_bv":0.438,"luminosity_solar":64.26877173170195,"metallicity_fe_h":0.19,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality D)","surface_gravity_log_g":2.06,"surface_temperature_k":6364,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-0.25,"proper_motion_dec_mas_yr":-4.57,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 35929"},{"catalog":"HIP","designation":"HIP 25546"}],"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."}