{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T07:54:19.699Z","years_from_j2000":26.674,"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-199546","name":"HD 199546","class":"g8iii_yellow_giant","category":"star","object_type":"G8III yellow giant","mag":8.14,"mag_band":"V","abs_mag":-0.138,"abs_mag_band":"V","distance_ly":1475.820753497582,"distance_method":"parallax","ra_deg":313.92606,"dec_deg":53.805878,"epoch_ra_deg":314.12078,"epoch_dec_deg":53.907954,"epoch_moved_arcsec":0.64,"pm_ra_mas_yr":0.17,"pm_dec_mas_yr":-23.98,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cygnus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-199546","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":376988100,"mass_solar":3.001,"radius_solar":11.333,"spectral_type":"G8III","uncertainties":{"metallicity_fe_h":[0.11,0.11]},"color_index_bv":0.98,"luminosity_solar":98.90084450210652,"metallicity_fe_h":0,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (2018A&A...612A..96F, quality C)","surface_gravity_log_g":2.728,"surface_temperature_k":5094,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":0.17,"proper_motion_dec_mas_yr":-23.98,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":81.0219},"designations":[{"catalog":"HD","designation":"HD 199546"},{"catalog":"HIP","designation":"HIP 103304"}],"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."}