that IGRINS is a very powerful (as well as
popular) visitor instrument to Gemini.
Daniel Jaffe of UT Austin is the IGRINS Prin-
cipal Investigator (PI). Chan Park of KASI is
deputy PI and KASI instrument PI. Jae-Joon
Lee at KASI supervises the IGRINS operation-
al program on the Korean side. The IGRINS
visit to Gemini is supported by the U.S.
National Science Foundation under grant
AST-1702267 (PI - Gregory Mace, University
of Texas at Austin), and by the Korean GMT
Project of KASI. Further technical details are
available in Yuk et al. (2010) (viewable here),
Park et al. (2014) (here), and Mace et al. (2016)
(here). IGRINS science support at Gemini is
provided by Hwihyun Kim.
2018A Weather
The weather loss at Gemini North was a
record high (in 18A as of early July). The
weather loss of more than 55% is similar to
what Gemini South suffered in 16A (see the
April 2016 issue of GeminiFocus, page 17).
In both cases the science program comple-
tion suffered greatly (Figures 4 and 5). Due
to the newly implemented “persistent band
1” philosophy, many of the 18A Band 1 pro-
grams in the North will be extended into
18B and will have future opportunities to
get data.
Figure 4.
The percentage of 13B
to 18A (partial semester,
up to July 3rd) programs
that obtained 80% or
more of their science
time in each semester.
Regular queue and Large
and Long Programs are
included, but not Fast
Turnaround or Director’s
Discretionary programs.
Low completion rates
correspond to poor-
weather semesters (e.g.,
North 16B and 18A; South
15A-16A and 17A) or
dome problems (North
13B and 14A).
Figure 5.
Telescope time use for
semesters 5A to 18A
(partial semester, up to
July 3rd). The distribution
of time used for science
and engineering, and lost
to faults and weather, is
shown.
July 2018
GeminiFocus
21