{"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":"2026-09-05T19:02:10.534Z","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-81174","name":"HD 81174","class":"g8iv_v_yellow_subgiant","category":"star","object_type":"G8IV/V yellow subgiant","mag":8.07,"mag_band":"V","abs_mag":3.883,"abs_mag_band":"V","distance_ly":224.31665802571203,"distance_method":"parallax","ra_deg":140.50599,"dec_deg":-54.543628,"epoch_ra_deg":140.714384,"epoch_dec_deg":-54.656852,"epoch_moved_arcsec":3.269,"pm_ra_mas_yr":19.41,"pm_dec_mas_yr":121,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Vela","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-81174","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"09223-5428","age_years":7915034000,"companions":[{"measured":2016,"magnitude":14.7,"components":"CD","discoverer_code":"DAM1605","separation_arcsec":10,"position_angle_deg":299}],"mass_solar":1.1,"radius_solar":1.986,"spectral_type":"G8IV/V","color_index_bv":0.819,"luminosity_solar":2.436688423459583,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1975MSS...C01....0H, quality D)","surface_gravity_log_g":4.051,"surface_temperature_k":5381,"proper_motion_ra_mas_yr":19.41,"proper_motion_dec_mas_yr":121,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":2.9638},"designations":[{"catalog":"HD","designation":"HD 81174"},{"catalog":"HIP","designation":"HIP 45937"}],"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."}