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Messier 2
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==References== {{reflist|30em|refs= <ref name=grillmair2022>{{cite journal|doi=10.3847/1538-4357/ac5bd7|title=The Extended Tidal Tails of NGC 7089 (M2) |year=2022 |last1=Grillmair |first1=Carl J. |journal=The Astrophysical Journal |volume=929 |issue=1 |page=89 |arxiv=2203.04425 |bibcode=2022ApJ...929...89G |s2cid=247318732 |doi-access=free }}</ref> <ref name=myeong2018>{{cite journal |arxiv=1805.00453 |last1=Myeong |first1=G. C |title=The Sausage Globular Clusters |journal=The Astrophysical Journal |volume=863 |issue=2 |pages=L28 |last2=Evans |first2=N. W |last3=Belokurov |first3=V |last4=Sanders |first4=J. L |last5=Koposov |first5=S. E |year=2018|bibcode=2018ApJ...863L..28M |doi=10.3847/2041-8213/aad7f7 |s2cid=67791285 |doi-access=free }}</ref> <ref name=omeara2014>{{cite book | author = Stephen James O'Meara | date = 7 April 2014 | title = Deep-Sky Companions: The Messier Objects | publisher = Cambridge University Press | pages = 47β | isbn = 978-1-107-01837-2 | url = https://books.google.com/books?id=fDQZAwAAQBAJ&pg=PA47}}</ref> <ref name=helmi2018>{{cite journal |arxiv=1804.09381 |title=Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way |journal=Astronomy and Astrophysics |volume=616 |pages=A12 |last1=Helmi |first1=A |last2=van Leeuwen |first2=F |last3=McMillan |first3=P J |last4=Massari |first4=D |last5=Antoja |first5=T |last6=Robin |first6=A |last7=Lindegren |first7=L |last8=Bastian |first8=U |others=Gaia Collaboration|year=2018|bibcode=2018A&A...616A..12G |doi=10.1051/0004-6361/201832698 |s2cid=260496632 }}</ref> <ref name=stobie1971>{{cite journal| bibcode=1971ApJ...168..381S | title=On the Difference Between the Oosterhoff Types i and II Globular Clusters | last1=Stobie | first1=R. S. | journal=The Astrophysical Journal | year=1971 | volume=168 | page=381 | doi=10.1086/151094 }}</ref> <ref name=mf2009>{{cite journal| bibcode=2009ApJ...694.1498M | title=The ACS Survey of Galactic Globular Clusters. VII. Relative Ages | last1=MarΓn-Franch | first1=Antonio | last2=Aparicio | first2=Antonio | last3=Piotto | first3=Giampaolo | last4=Rosenberg | first4=Alfred | last5=Chaboyer | first5=Brian | last6=Sarajedini | first6=Ata | last7=Siegel | first7=Michael | last8=Anderson | first8=Jay | last9=Bedin | first9=Luigi R. | last10=Dotter | first10=Aaron | last11=Hempel | first11=Maren | last12=King | first12=Ivan | last13=Majewski | first13=Steven | last14=Milone | first14=Antonino P. | last15=Paust | first15=Nathaniel | last16=Reid | first16=I. Neill | journal=The Astrophysical Journal | year=2009 | volume=694 | issue=2 | page=1498 | doi=10.1088/0004-637X/694/2/1498 | arxiv=0812.4541 | s2cid=118407466 }}</ref> <ref name=vdb2011>{{Cite journal |last=van den Bergh |first=Sidney |date=2011 |title=Some Systematics of Galactic Globular Clusters |journal=Publications of the Astronomical Society of the Pacific |volume=123 |issue=907 |pages=1044β1053 |bibcode=2011PASP..123.1044V |doi=10.1086/662132 |arxiv=1108.0708 |doi-access=free |issn=0004-6280}}</ref> <ref name=aj140_6_1830>{{cite journal | display-authors=1 | last1=Goldsbury | first1=Ryan | last2=Richer | first2=Harvey B. | last3=Anderson | first3=Jay | last4=Dotter | first4=Aaron | last5=Sarajedini | first5=Ata | last6=Woodley | first6=Kristin | title=The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters | journal=The Astronomical Journal | volume=140 | issue=6 | pages=1830β1837 |date=December 2010 | doi=10.1088/0004-6256/140/6/1830 | bibcode=2010AJ....140.1830G |arxiv = 1008.2755 | s2cid=119183070 }}</ref> <ref name=hcob849_11>{{cite journal | last1=Shapley | first1=Harlow | last2=Sawyer | first2=Helen B. | title=A Classification of Globular Clusters | journal=Harvard College Observatory Bulletin | volume=849 | issue=849 | pages=11β14 |date=August 1927 | bibcode=1927BHarO.849...11S }}</ref> <!-- unused <ref name=apj670_1_363>{{citation | display-authors=1 | last1=Hessels | first1=J. W. T. | last2=Ransom | first2=S. M. | last3=Stairs | first3=I. H. | last4=Kaspi | first4=V. M. | last5=Freire | first5=P. C. C. | title=A 1.4 GHz Arecibo Survey for Pulsars in Globular Clusters | journal=The Astrophysical Journal | volume=670 | issue=1 | pages=363β378 |date=November 2007 | doi=10.1086/521780 | bibcode=2007ApJ...670..363H |arxiv = 0707.1602 }}</ref> --> <ref name=apj742_1_51>{{cite journal | display-authors=1 | last1=Boyles | first1=J. | last2=Lorimer | first2=D. R. | last3=Turk | first3=P. J. | last4=Mnatsakanov | first4=R. | last5=Lynch | first5=R. S. | last6=Ransom | first6=S. M. | last7=Freire | first7=P. C. | last8=Belczynski | first8=K. | title=Young Radio Pulsars in Galactic Globular Clusters | journal=The Astrophysical Journal | volume=742 | issue=1 | page=51 |date=November 2011 | doi=10.1088/0004-637X/742/1/51 | bibcode=2011ApJ...742...51B |arxiv = 1108.4402 | s2cid=118649860 }}</ref> <ref name="simbad">{{cite simbad | title=M 2 | access-date=2006-11-15 }}</ref> }}
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