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A New Distant Milky Way Globular Cluster in the Pan-STARRS1 3π Survey

Laevens, B.P.M.; Martin, N.F.; Sesar, B.; Bernard, E.J.; Rix, H.-W.; Slater, C.T.; Bell, E.F.; Ferguson, A.M.N.; Schlafly, E.F.; Burgett, W.S.; Chambers, K.C.; Denneau, L.; Draper, P.W.; Kaiser, N.; Kudritzki, R.-P.; Magnier, E.A.; Metcalfe, N.; Morgan, J.S.; Price, P.A.; Sweeney, W.E.; Tonry, J.L.; Wainscoat, R.J.; Waters, C.

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B.P.M. Laevens

N.F. Martin

B. Sesar

E.J. Bernard

H.-W. Rix

C.T. Slater

E.F. Bell

A.M.N. Ferguson

E.F. Schlafly

W.S. Burgett

K.C. Chambers

L. Denneau

N. Kaiser

R.-P. Kudritzki

E.A. Magnier

J.S. Morgan

P.A. Price

W.E. Sweeney

J.L. Tonry

R.J. Wainscoat

C. Waters


We present a new satellite in the outer halo of the Galaxy, the first Milky Way satellite found in the stacked photometric catalog of the Panoramic Survey Telescope and Rapid Response System 1 (Pan-STARRS1) Survey. From follow-up photometry obtained with WFI on the MPG/ESO 2.2 m telescope, we argue that the object, located at a heliocentric distance of 145 ± 17 kpc, is the most distant Milky Way globular cluster yet known. With a total magnitude of MV = –4.3 ± 0.2 and a half-light radius of 20 ± 2 pc, it shares the properties of extended globular clusters found in the outer halo of our Galaxy and the Andromeda galaxy. The discovery of this distant cluster shows that the full spatial extent of the Milky Way globular cluster system has not yet been fully explored.


Laevens, B., Martin, N., Sesar, B., Bernard, E., Rix, H., Slater, C., …Waters, C. (2014). A New Distant Milky Way Globular Cluster in the Pan-STARRS1 3π Survey. Astrophysical Journal Letters, 786(1), Article L3.

Journal Article Type Article
Acceptance Date Mar 24, 2014
Publication Date May 1, 2014
Deposit Date Jun 16, 2015
Publicly Available Date Jun 30, 2015
Journal Astrophysical Journal Letters
Print ISSN 2041-8205
Electronic ISSN 2041-8213
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 786
Issue 1
Article Number L3
Keywords Globular clusters: individual (PSO J174.0675-10.8774), Local Group.


Published Journal Article (646 Kb)

Copyright Statement
© 2014. The American Astronomical Society. All rights reserved.

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