{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T18:09:57.909Z","years_from_j2000":26.684,"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-335129","name":"HD 335129","class":"g5_yellow_star","category":"star","object_type":"G5 yellow star","mag":9.16,"mag_band":"V","abs_mag":4.454,"abs_mag_band":"V","distance_ly":284.85258635545046,"distance_method":"parallax","ra_deg":311.753385,"dec_deg":30.921914,"epoch_ra_deg":312.029684,"epoch_dec_deg":31.020512,"epoch_moved_arcsec":1.691,"pm_ra_mas_yr":-24.6,"pm_dec_mas_yr":58.41,"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-335129","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"G5","color_index_bv":0.724,"luminosity_solar":1.4401243711755702,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1995A&AS..110..367N, quality E)","proper_motion_ra_mas_yr":-24.6,"proper_motion_dec_mas_yr":58.41},"designations":[{"catalog":"HD","designation":"HD 335129"},{"catalog":"HIP","designation":"HIP 102556"}],"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."}