{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-02T23:44:23.322Z","years_from_j2000":26.671,"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-34599","name":"HD 34599","class":"g3v_yellow_main_sequence_star","category":"star","object_type":"G3V yellow main-sequence star","mag":8.28,"mag_band":"V","abs_mag":4.937,"abs_mag_band":"V","distance_ly":152.05410329154577,"distance_method":"parallax","ra_deg":79.14610499999999,"dec_deg":-42.514401,"epoch_ra_deg":79.356112,"epoch_dec_deg":-42.483576,"epoch_moved_arcsec":2.501,"pm_ra_mas_yr":14.9,"pm_dec_mas_yr":92.57,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Columba","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-34599","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":8589220000,"mass_solar":0.951,"radius_solar":1.044,"spectral_type":"G3V","uncertainties":{"metallicity_fe_h":[0.03,0.03]},"color_index_bv":0.66,"luminosity_solar":0.9229963848404533,"metallicity_fe_h":0.08,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality C)","surface_gravity_log_g":4.338,"surface_temperature_k":5688,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":14.9,"proper_motion_dec_mas_yr":92.57,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":1.026},"designations":[{"catalog":"HD","designation":"HD 34599"},{"catalog":"HIP","designation":"HIP 24597"}],"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."}