{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-06T03:46:43.778Z","years_from_j2000":26.679,"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-147633","name":"HD 147633","class":"g2v_yellow_main_sequence_star","category":"star","object_type":"G2V yellow main-sequence star","mag":7.33,"mag_band":"V","abs_mag":3.97,"abs_mag_band":"V","distance_ly":153.26903579854064,"distance_method":"parallax","ra_deg":246.323415,"dec_deg":-49.147866,"epoch_ra_deg":246.824365,"epoch_dec_deg":-49.210103,"epoch_moved_arcsec":3.461,"pm_ra_mas_yr":-91.95,"pm_dec_mas_yr":-91.5,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Norma","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-147633","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16253-4909","companions":[{"measured":2025,"magnitude":null,"components":"Ba,Bb","discoverer_code":"CVN  27","separation_arcsec":0.2,"position_angle_deg":33},{"measured":2025,"magnitude":8.23,"components":"AB","discoverer_code":"COO 197","separation_arcsec":2.4,"position_angle_deg":89},{"measured":2016,"magnitude":12,"components":"AC","discoverer_code":"COO 197","separation_arcsec":20.2,"position_angle_deg":87}],"mass_solar":0.923,"radius_solar":1.28,"spectral_type":"G2V","color_index_bv":0.3,"luminosity_solar":2.2490546058357808,"metallicity_fe_h":-0.2,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (2006A&A...460..695T, quality C)","surface_gravity_log_g":4.246,"surface_temperature_k":5562,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-91.95,"proper_motion_dec_mas_yr":-91.5,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":1.3979},"designations":[{"catalog":"HD","designation":"HD 147633"},{"catalog":"HIP","designation":"HIP 80448"}],"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."}