Leo v: A companion of a companion of the Milky Way galaxy?

V. Belokurov, M. G. Walker, N. W. Evans, D. C. Faria, G. Gilmore, M. J. Irwin, S. Koposov, M. Mateo, E. Olszewski, D. B. Zucker

Research output: Contribution to journalArticlepeer-review

136 Scopus citations


We report the discovery of a new Milky Way satellite in the constellation Leo, identified in data from the Sloan Digital Sky Survey. It lies at a distance of-180 kpc, and is separated by ≤⊙3° from another recent discovery, Leo IV. We present follow-up imaging from the Isaac Newton Telescope and spectroscopy from the Hectochelle fiber spectrograph at the Multiple Mirror Telescope. Leo V's heliocentric velocity is-173.3 ±3.1 km s-1, offset by-40 km s-1 from that of Leo IV. A simple interpretation of the kinematic data is that both objects may lie on the same stream, although the implied orbit is only modestly eccentric (e-0.2)

Original languageEnglish (US)
Pages (from-to)L83-L86
JournalAstrophysical Journal
Issue number2 PART 2
StatePublished - 2008


  • Dwarf
  • Galaxies
  • Individual (Leo)
  • Local group

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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