{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-09-01T00:38:51.002Z","years_from_j2000":26.665,"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-147752","name":"HD 147752","class":"k1v_orange_dwarf","category":"star","object_type":"K1V orange dwarf","mag":9.25,"mag_band":"V","abs_mag":6.137,"abs_mag_band":"V","distance_ly":136.7531291437202,"distance_method":"parallax","ra_deg":245.957925,"dec_deg":-2.974919,"epoch_ra_deg":246.308608,"epoch_dec_deg":-3.037995,"epoch_moved_arcsec":2.301,"pm_ra_mas_yr":-56.79,"pm_dec_mas_yr":-64.98,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ophiuchus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-147752","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16238-0258","companions":[{"measured":2019,"magnitude":12.9,"components":null,"discoverer_code":"TOK 901","separation_arcsec":0.2,"position_angle_deg":53}],"spectral_type":"K1V","color_index_bv":0.905,"luminosity_solar":0.30563282803659647,"metallicity_fe_h":0.02,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality C)","surface_gravity_log_g":4.51,"surface_temperature_k":5051,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-56.79,"proper_motion_dec_mas_yr":-64.98,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 147752"},{"catalog":"HIP","designation":"HIP 80315"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}