{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T17:05:58.705Z","years_from_j2000":26.654,"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":"fomalhaut","name":"Fomalhaut","class":"a4v_white_main_sequence_star","category":"star","object_type":"A4V white main-sequence star","mag":1.17,"mag_band":"V","abs_mag":1.737,"abs_mag_band":"V","distance_ly":25.125782713787046,"distance_method":"parallax","ra_deg":344.41256999999996,"dec_deg":-29.622236,"epoch_ra_deg":344.783082,"epoch_dec_deg":-29.479988,"epoch_moved_arcsec":9.806,"pm_ra_mas_yr":329.22,"pm_dec_mas_yr":-164.22,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Piscis Austrinus","discovered":"Antiquity","featured":true,"url":"https://spacecatalog.org/object/fomalhaut","radius_km":null,"radius_kind":null,"data_quality":null,"description":"Wrapped in a sharp-edged ring of debris whose inner edge suggests unseen planets doing the sweeping.","properties":{"wds_id":"22577-2937","companions":[{"measured":2006,"magnitude":24.6,"components":"Aa,Ab","discoverer_code":"KAL   1","separation_arcsec":12.7,"position_angle_deg":251}],"wikidata_id":"Q13169","also_known_as":["Alpha Piscis Austrini"],"spectral_type":"A4V","color_index_bv":0.145,"luminosity_solar":17.587333541355722,"wikipedia_article":"Fomalhaut","radial_velocity_km_s":6.1,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","proper_motion_ra_mas_yr":329.22,"proper_motion_dec_mas_yr":-164.22},"designations":[{"catalog":"Bayer/Flamsteed","designation":"24 Alpha PsA"},{"catalog":"Common name","designation":"Fomalhaut"},{"catalog":"Gliese","designation":"Gl 881"},{"catalog":"HD","designation":"HD 216956"},{"catalog":"HIP","designation":"HIP 113368"},{"catalog":"HR","designation":"HR 8728"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T16:03:54.983Z","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."}