{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T08:34:46.659Z","years_from_j2000":26.683,"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-147512","name":"HD 147512","class":"g8_k0v_yellow_main_sequence_star","category":"star","object_type":"G8/K0V yellow main-sequence star","mag":7.34,"mag_band":"V","abs_mag":5.138,"abs_mag_band":"V","distance_ly":89.92457490028333,"distance_method":"parallax","ra_deg":245.63634,"dec_deg":-4.249244,"epoch_ra_deg":245.990143,"epoch_dec_deg":-4.313927,"epoch_moved_arcsec":5.143,"pm_ra_mas_yr":-79.68,"pm_dec_mas_yr":-175.52,"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-147512","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16225-0415","companions":[{"measured":2017,"magnitude":12.68,"components":"AC","discoverer_code":"BU 1453","separation_arcsec":83.6,"position_angle_deg":349},{"measured":2017,"magnitude":8.53,"components":"AB","discoverer_code":"BU 1453","separation_arcsec":120.6,"position_angle_deg":22}],"mass_solar":0.865,"radius_solar":0.998,"spectral_type":"G8/K0V","uncertainties":{"metallicity_fe_h":[0.024,0.024]},"color_index_bv":0.718,"luminosity_solar":0.7670081876935096,"metallicity_fe_h":-0.07,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality D)","surface_gravity_log_g":4.39,"surface_temperature_k":5400,"metallicity_fe_h_source":"Median of 6 spectroscopic determinations in 6 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-79.68,"proper_motion_dec_mas_yr":-175.52,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.7603},"designations":[{"catalog":"HD","designation":"HD 147512"},{"catalog":"HIP","designation":"HIP 80218"}],"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."}