{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-04T18:30:54.927Z","years_from_j2000":26.676,"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-149964","name":"HD 149964","class":"g5_8_v_yellow_main_sequence_star","category":"star","object_type":"G5/8(V) yellow main-sequence star","mag":10.31,"mag_band":"V","abs_mag":5.366,"abs_mag_band":"V","distance_ly":317.89124894902346,"distance_method":"parallax","ra_deg":249.88974000000002,"dec_deg":-37.269574,"epoch_ra_deg":250.340562,"epoch_dec_deg":-37.322936,"epoch_moved_arcsec":1.406,"pm_ra_mas_yr":22.08,"pm_dec_mas_yr":-47.85,"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-149964","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16396-3716","age_years":9270089000,"companions":[{"measured":2016,"magnitude":13.52,"components":null,"discoverer_code":"RST3955","separation_arcsec":4.6,"position_angle_deg":318}],"mass_solar":0.939,"radius_solar":1.031,"spectral_type":"G5/8(V)","luminosity_solar":0.6217273892939604,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1982MSS...C03....0H, quality E)","surface_gravity_log_g":4.375,"surface_temperature_k":5659,"proper_motion_ra_mas_yr":22.08,"proper_motion_dec_mas_yr":-47.85,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.9967},"designations":[{"catalog":"HD","designation":"HD 149964"},{"catalog":"HIP","designation":"HIP 81569"}],"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."}