{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-05T21:48:05.017Z","years_from_j2000":26.679,"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-66454","name":"HD 66454","class":"k1iii_orange_giant","category":"star","object_type":"(K1III) orange giant","mag":6.89,"mag_band":"V","abs_mag":-1.551,"abs_mag_band":"V","distance_ly":1591.0067921647824,"distance_method":"parallax","ra_deg":120.655905,"dec_deg":-27.544303,"epoch_ra_deg":120.932278,"epoch_dec_deg":-27.618927,"epoch_moved_arcsec":0.289,"pm_ra_mas_yr":-10.04,"pm_dec_mas_yr":-4.09,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Puppis","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-66454","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"08026-2733","age_years":270606730,"companions":[{"measured":2018,"magnitude":8.41,"components":"AB","discoverer_code":"HJ 4037","separation_arcsec":6.5,"position_angle_deg":245},{"measured":2018,"magnitude":9.22,"components":"AC","discoverer_code":"HJ 4037","separation_arcsec":64.5,"position_angle_deg":74}],"mass_solar":3.4,"radius_solar":15.13,"spectral_type":"(K1III)","color_index_bv":0.752,"luminosity_solar":363.412616064223,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1982MSS...C03....0H, quality E)","surface_gravity_log_g":2.536,"surface_temperature_k":5051,"proper_motion_ra_mas_yr":-10.04,"proper_motion_dec_mas_yr":-4.09,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":143.94},"designations":[{"catalog":"HD","designation":"HD 66454"},{"catalog":"HIP","designation":"HIP 39352"}],"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."}