{"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":"2026-09-02T03:24:22.665Z","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-41990","name":"HD 41990","class":"a9_f0v_white_main_sequence_star","category":"star","object_type":"A9/F0V white main-sequence star","mag":8.44,"mag_band":"V","abs_mag":2.138,"abs_mag_band":"V","distance_ly":594.0918850727819,"distance_method":"parallax","ra_deg":91.84778999999999,"dec_deg":-21.199749,"epoch_ra_deg":92.133884,"epoch_dec_deg":-21.202696,"epoch_moved_arcsec":0.321,"pm_ra_mas_yr":8.64,"pm_dec_mas_yr":-8.37,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Lepus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-41990","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"06074-2112","companions":[{"measured":2024,"magnitude":10.87,"components":null,"discoverer_code":"HDS 834","separation_arcsec":0.2,"position_angle_deg":218}],"spectral_type":"A9/F0V","color_index_bv":0.382,"luminosity_solar":12.156260552373798,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality D)","proper_motion_ra_mas_yr":8.64,"proper_motion_dec_mas_yr":-8.37},"designations":[{"catalog":"HD","designation":"HD 41990"},{"catalog":"HIP","designation":"HIP 29018"}],"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."}