{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T04:57:35.596Z","years_from_j2000":26.682,"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-167588","name":"HD 167588","class":"f8v_yellow_white_main_sequence_star","category":"star","object_type":"F8V yellow-white main-sequence star","mag":6.51,"mag_band":"V","abs_mag":3.378,"abs_mag_band":"V","distance_ly":137.96806165071507,"distance_method":"parallax","ra_deg":273.68332499999997,"dec_deg":29.207306,"epoch_ra_deg":273.944141,"epoch_dec_deg":29.213182,"epoch_moved_arcsec":6.416,"pm_ra_mas_yr":11.79,"pm_dec_mas_yr":-240.17,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Hercules","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-167588","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":5721574000,"mass_solar":1.184,"radius_solar":1.949,"spectral_type":"F8V","uncertainties":{"metallicity_fe_h":[0.039,0.039]},"color_index_bv":0.579,"luminosity_solar":3.8797165729369056,"metallicity_fe_h":-0.37,"radial_velocity_km_s":3,"spectral_type_source":"SIMBAD (2000A&AS..141..491C, quality D)","surface_gravity_log_g":4.016,"surface_temperature_k":5823,"metallicity_fe_h_source":"Median of 6 spectroscopic determinations in 8 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":11.79,"proper_motion_dec_mas_yr":-240.17,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":3.9272},"designations":[{"catalog":"HD","designation":"HD 167588"},{"catalog":"HIP","designation":"HIP 89408"},{"catalog":"HR","designation":"HR 6831"}],"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."}