{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.688","julian_year":2026.688,"time":"2026-09-09T03:35:31.649Z","years_from_j2000":26.688,"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-147722","name":"HD 147722","class":"g0_yellow_star","category":"star","object_type":"G0 yellow star","mag":5.4,"mag_band":"V","abs_mag":2.801,"abs_mag_band":"V","distance_ly":107.9274284811144,"distance_method":"parallax","ra_deg":246.16568999999998,"dec_deg":-29.704663,"epoch_ra_deg":246.588361,"epoch_dec_deg":-29.767348,"epoch_moved_arcsec":2.866,"pm_ra_mas_yr":69.27,"pm_dec_mas_yr":-82.06,"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-147722","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16247-2942","age_years":5292994500,"companions":[{"measured":2018,"magnitude":6.6,"components":null,"discoverer_code":"H N  39","separation_arcsec":4,"position_angle_deg":359}],"mass_solar":1.207,"radius_solar":1.972,"spectral_type":"G0","uncertainties":{"metallicity_fe_h":[0.03,0.03]},"color_index_bv":0.625,"luminosity_solar":6.600852070021595,"metallicity_fe_h":0.13,"radial_velocity_km_s":-0.2,"spectral_type_source":"SIMBAD (quality D)","surface_gravity_log_g":4.029,"surface_temperature_k":5880,"metallicity_fe_h_source":"Median of 3 spectroscopic determinations in 3 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":69.27,"proper_motion_dec_mas_yr":-82.06,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":4.1954},"designations":[{"catalog":"HD","designation":"HD 147722"},{"catalog":"HIP","designation":"HIP 80399"},{"catalog":"HR","designation":"HR 6105"}],"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."}