{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.664","julian_year":2026.664,"time":"2026-08-31T15:44:01.553Z","years_from_j2000":26.664,"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":"m56","name":"M56","class":"globular_cluster","category":"cluster","object_type":"Globular cluster","mag":8.4,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":32289.481393957598,"distance_method":"Globular-cluster distance scale (Harris 2010)","ra_deg":289.1479583333333,"dec_deg":30.1845,"epoch_ra_deg":289.409347,"epoch_dec_deg":30.231652,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Lyra","discovered":"1779","featured":false,"url":"https://spacecatalog.org/object/m56","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":8.9,"v_mag":8.4,"redshift":-0.000457,"wikidata_id":"Q13967","discovered_by":"Charles Messier","ngc_type_code":"GCl","major_axis_arcmin":5.8,"wikipedia_article":"Messier 56","distance_reference":"NGC 6779","radial_velocity_km_s":-137},"designations":[{"catalog":"IAU cluster","designation":"C 1914+300"},{"catalog":"Messier","designation":"M 56"},{"catalog":"MWSC","designation":"MWSC 3077"},{"catalog":"NGC","designation":"NGC 6779"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}