C.D.S. - SIMBAD4 rel 1.8 - 2023.11.28CET14:43:20 M21 --- Object M 21 --- OpC --- OID=@2535882 (@@140894,2) --- coobox=18517 Coordinates(ICRS,ep=J2000,eq=2000): 18 04 08.6 -22 30 18 (Opt ) D [~ ~ ] 2021A&A...647A..19T Coordinates(FK4,ep=B1950,eq=1950): 18 01 07.2 -22 30 29 Coordinates(Gal,ep=J2000,eq=2000): 007.6560 -00.3475 hierarchy counts: #parents=0, #children=535, #siblings=0 Proper motions: 0.525 -1.521 [0.012 0.023 90] C 2020A&A...633A..99C Parallax: 0.798 [0.005] C 2020A&A...633A..99C Radial Velocity: -18.22 [1.31] B 2019A&A...623A..80C Redshift: -0.000061 [0.000004] B 2019A&A...623A..80C cz: -18.22 [1.31] B 2019A&A...623A..80C Flux Spectral type: ~ ~ ~ Morphological type: ~ ~ ~ Angular size: 14.00 14.00 90 (~) D 2013A&A...560A..76M Identifiers (10): C 1801-225 M 21 NGC 6531 OCISM 3 OCl 26.0 [KPR2004b] 427 [SC95] M 248 [SC96] GC 372 [SC96] Mis 946 [KPS2012] MWSC 2796 Bibcodes 1850-2024 () (146): 2023A&A...673A.128G 2022A&A...664A..66M 2022A&A...664A.175P 2022MNRAS.509.4276F 2021A&A...646A..98T 2021A&A...647A..19T 2021A&A...650A..67R 2021A&A...651A.104P 2021A&A...656A..49H 2021ApJ...912....5H 2021ApJ...912..165R 2021MNRAS.503.3279S 2021MNRAS.504..356D 2020A&A...633A..99C 2020A&A...640A...1C 2020ApJS..246...15S 2020MNRAS.495.2882S 2020PASJ...72..104T 2019A&A...623A..80C 2019A&A...623A.108B 2019ApJS..245...32L 2019MNRAS.484.5102K 2018A&A...610A..30A 2018A&A...618A..93C 2018MNRAS.473..849D 2018MNRAS.478.5184D 2017A&A...600A.106C 2017AstBu..72..257L 2017MNRAS.470.3937S 2016A&A...585A.101K 2016A&A...593A.116J 2016ApJ...831...32N 2016AstL...42..314G 2015AJ....149....7C 2014A&A...564A..79D 2014ApJ...796..127C 2014PASP..126..398H 2013A&A...558A..53K 2013A&A...560A..76M 2013ApJ...762..123W 2012AJ....143....3D 2012AstL...38..506G 2012MNRAS.421.3159M 2011JHA....42..177H 2010A&A...510A..72F 2010A&A...524A..75A 2010JRASC.104..162G 2010MNRAS.407.2109V 2009A&A...495..807K 2009A&A...504..681K 2009AJ....138.1116S 2009MNRAS.399.2146W 2008A&A...477..165P 2007A&A...463..789A 2007A&A...468..151P 2006A&A...446..949D 2006ApJ...641L.121T 2006ChJAA...6..287Z 2005A&A...438.1163K 2005ApJS..161..118M 2005MNRAS.357..345Z 2005MNSSA..64..129S 2004AN....325..740K 2004ApJ...616..283T 2004RvMP...76..125M 2003AJ....125.1397C 2003ARep...47....6L 2003PhR...382..303T 2003RMxAA..39..171P 2002A&A...381..884G 2002A&A...383..153N 2002A&A...388..168D 2002S&T...103d..32F 2001AstL...27..728R 2001MNRAS.324..367J 2000A&A...357..451F 2000A&A...362..580V 2000A&A...363..537R 2000A&AS..146..251B 2000ApJ...530..277E 1999AstL...25..595R 1999Obs...119...16S 1999RMxAC...8..107R 1998A&A...333..897R 1998AJ....115..734S 1998Ap.....41..261V 1997A&AS..123...63V 1997ApJ...481L..47S 1997PAZh...23...90G 1996AJ....112.1073F 1996ApJS..104..101S 1995A&AS..109..375A 1995AZh....72..333D 1995ApJ...444..663S 1995ApJS...96..605S 1994A&AS..104..379B 1994AJ....107..206R 1994JRASC..88..176T 1993AGAb....9..165K 1992MNRAS.259..489F 1991ApJ...378..106A 1991Ast....19g..74H 1991MNRAS.249...76B 1990AGAb....4...32S 1990PAZh...16..619K 1989Afz....31...37E 1988AZh....65..330E 1988GriO...52d...2V 1988NASAR1202....1L 1988PAZh...14..817E 1987A&A...176...34H 1987A&A...177..177G 1987AZh....64..965E 1987PAZh...13..850U 1986A&A...158...45M 1986BICDS..31..175M 1986IrAJ...17..477B 1985AN....306...45S 1984AISAO..18...64P 1984BICDS..26....9M 1983A&A...121..237B 1982ApJS...49..425J 1982PASJ...34..231I 1981A&AS...44..467M 1981SvA....25...25S 1977A&A....57..135B 1976A&A....51..247B 1976ApJ...204..493S 1976ApJS...30..451H 1973BICDS...4...22M 1971A&AS....4..241B 1970PDDO....4....1H 1968ArA.....5....1L 1968PROE....6..181S 1966AN....289...51D 1965ApJS...12..215H 1963CoBos..18....1P 1963ZA.....57..117B 1961LowOB...5..133J 1961PUSNO..17..343H 1961VA......8..139H 1953MNRAS.113..758S 1951ApJ...113..624M 1949ApJ...110..117S 1937LicOB..18...89Z 1850CDT..1784..227M Measures (distance:6 Fe_H:2 PLX:6 PM:8 velocities:4 ): distance:6Fe_H:2PLX:6PM:8velocities:4 Notes (0) : ================================================================================