{"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":"2026-09-02T20:47:00.969Z","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-149447","name":"HD 149447","class":"k5iii_orange_giant","category":"star","object_type":"K5III orange giant","mag":4.18,"mag_band":"V","abs_mag":-0.927,"abs_mag_band":"V","distance_ly":342.6011822812216,"distance_method":"parallax","ra_deg":249.09363000000002,"dec_deg":-35.255326,"epoch_ra_deg":249.536163,"epoch_dec_deg":-35.31019,"epoch_moved_arcsec":0.509,"pm_ra_mas_yr":14.72,"pm_dec_mas_yr":12.14,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Scorpius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-149447","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"K5III","uncertainties":{"metallicity_fe_h":[0.34,0.34]},"color_index_bv":1.535,"luminosity_solar":204.5502431109354,"metallicity_fe_h":-0.31,"radial_velocity_km_s":-2,"spectral_type_source":"SIMBAD (1982MSS...C03....0H, quality C)","surface_gravity_log_g":-0.25,"surface_temperature_k":3875,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":14.72,"proper_motion_dec_mas_yr":12.14,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 149447"},{"catalog":"HIP","designation":"HIP 81304"},{"catalog":"HR","designation":"HR 6166"}],"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."}