1 Director’s Message
Laura Ferrarese
3 Classifying Ultra-faint Satellite
Systems in the Milky Way’s Halo
Blair Conn and Helmut Jerjen
8 Science Highlights
John Blakeslee
13 On the Horizon
Gemini staff contributions
17 News for Users
Gemini staff contributions
21 Public Outreach Efforts Soar in
Hawai‘i and Chile
Janice Harvey and Manuel Paredes
ON THE COVER:
Composite image of the ultra-diffuse galaxy
NGC1051-DF2 which was found to be devoid
of dark matter. Also shown is a blow-up of
one of the galaxy’s globular clusters and a
spectrum of it from the W.M. Keck Observatory.
The work, led by Pieter van Dokkum of Yale
University, is featured in this issue’s Science
Highlights starting on page 8.
GeminiFocus April 2018
GeminiFocus is a quarterly publication
of the Gemini Observatory
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Phone: (808) 974-2500 / Fax: (808) 974-2589
Online viewing address:
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Managing Editor: Peter Michaud
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Any opinions, findings, and conclusions or recommendations
expressed in this material are those of the author(s) and do not
necessarily reflect the views of the National Science Foundation
or the Gemini Partnership.
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GeminiFocus
April 2018