{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T16:45:56.649Z","years_from_j2000":26.67,"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-149249","name":"HD 149249","class":"b2_3iii_iv_blue_white_giant","category":"star","object_type":"B2/3III/IV blue-white giant","mag":7.34,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":249.021645,"dec_deg":-51.239798,"epoch_ra_deg":249.538953,"epoch_dec_deg":-51.29486,"epoch_moved_arcsec":0.084,"pm_ra_mas_yr":-0.02,"pm_dec_mas_yr":-3.16,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ara","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-149249","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16361-5114","companions":[{"measured":2016,"magnitude":10.9,"components":"AB","discoverer_code":"I   374","separation_arcsec":2.8,"position_angle_deg":299},{"measured":2016,"magnitude":13,"components":"AC","discoverer_code":"I   374","separation_arcsec":22.8,"position_angle_deg":355},{"measured":2016,"magnitude":14.2,"components":"AD","discoverer_code":"I   374","separation_arcsec":28.6,"position_angle_deg":130}],"spectral_type":"B2/3III/IV","color_index_bv":0.01,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality E)","proper_motion_ra_mas_yr":-0.02,"proper_motion_dec_mas_yr":-3.16},"designations":[{"catalog":"HD","designation":"HD 149249"},{"catalog":"HIP","designation":"HIP 81281"}],"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."}