{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T05:47:59.968Z","years_from_j2000":26.666,"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-45339","name":"HD 45339","class":"a8_9v_white_main_sequence_star","category":"star","object_type":"A8/9V white main-sequence star","mag":9,"mag_band":"V","abs_mag":0.702,"abs_mag_band":"V","distance_ly":1489.2985134939709,"distance_method":"parallax","ra_deg":96.73426500000001,"dec_deg":4.153617,"epoch_ra_deg":97.089025,"epoch_dec_deg":4.137895,"epoch_moved_arcsec":0.137,"pm_ra_mas_yr":0.88,"pm_dec_mas_yr":-5.05,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Monoceros","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-45339","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"06269+0409","companions":[{"measured":2013,"magnitude":9.76,"components":null,"discoverer_code":"HEI 699","separation_arcsec":0.5,"position_angle_deg":170}],"spectral_type":"A8/9V","color_index_bv":0.272,"luminosity_solar":45.62469770768503,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality D)","proper_motion_ra_mas_yr":0.88,"proper_motion_dec_mas_yr":-5.05},"designations":[{"catalog":"HD","designation":"HD 45339"},{"catalog":"HIP","designation":"HIP 30690"}],"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."}