{"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":"2026-09-01T23:48:19.244Z","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-46729","name":"HD 46729","class":"g6iii_iv_yellow_giant","category":"star","object_type":"G6III/IV yellow giant","mag":8.95,"mag_band":"V","abs_mag":0.389,"abs_mag_band":"V","distance_ly":1681.2183846774565,"distance_method":"parallax","ra_deg":98.02858499999999,"dec_deg":-51.713775,"epoch_ra_deg":98.18463,"epoch_dec_deg":-51.732554,"epoch_moved_arcsec":0.051,"pm_ra_mas_yr":-1.24,"pm_dec_mas_yr":1.45,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Carina","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-46729","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"06321-5143","age_years":317636160,"companions":[{"measured":2015,"magnitude":11.68,"components":null,"discoverer_code":"HDS 894","separation_arcsec":8,"position_angle_deg":245}],"mass_solar":3.202,"radius_solar":12.541,"spectral_type":"G6III/IV","color_index_bv":0.8,"luminosity_solar":60.869537233490085,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality D)","surface_gravity_log_g":2.403,"surface_temperature_k":4814,"proper_motion_ra_mas_yr":-1.24,"proper_motion_dec_mas_yr":1.45,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":84.9329},"designations":[{"catalog":"HD","designation":"HD 46729"},{"catalog":"HIP","designation":"HIP 31146"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}