{"id":2131085,"slug":"m-21","name":"M 21","domain":"deep-sky","class":"cluster","otype":"OpC","otype_label":"OpenCluster","ra":271.0358333333333,"dec":-22.505,"coo_err_mas":null,"coo_bibcode":"2021A&A...647A..19T","plx_mas":0.798,"pmra":0.525,"pmdec":-1.521,"rv_kms":-18.22,"redshift":-6.077353e-05,"dist_pc":null,"vmag":null,"bmag":null,"gmag":null,"jmag":null,"kmag":null,"sp_type":null,"morph_type":null,"size_maj":110.0,"size_min":110.0,"size_angle":0.0,"nbref":158,"simbad_oid":2535882,"gaia_dr3":null,"jpl_spkid":null,"ned_name":null,"exo_name":null,"host_object_id":null,"depth":0,"deep_at":null,"views":7,"first_seen":"2026-08-14T16:50:56.835646+00:00","updated_at":"2026-08-14T16:50:56.835646+00:00","identifiers":["C 1801-225","[KPR2004b] 427","[KPS2012] MWSC 2796","M 21","NGC 6531","OCISM 3","OCl 26.0","[SC95] M 248","[SC96] GC 372","[SC96] Mis 946"],"measurements":[],"orbit":null,"exoplanet":null,"sources":[]}