Observers can
apply for time
with the following
common-user instruments
on the 4.2-m William Herschel Telescope:
-
ISIS - single-slit spectroscopy, R < 10000, 4' slit,
spectro-polarimetry
-
ACAM - permanently mounted high-throughput
imager (8 arcmin fov) / spectrograph
-
AF2/WYFFOS - multi-object fibre-fed spectroscopy, R < 3000, 40' field
-
NAOMI/OASIS - integral-field spectroscopy with or without
natural-guide-star adaptive optics (NGS AO), R < 4000, 17" field
-
NAOMI/INGRID - IR imaging with or without
NGS AO, 40" field (coronagraphy is also possible, with
OSCA, 25" field)
-
LIRIS - IR spectroscopy, R < 4000, and imaging, 4' field
-
prime-focus - optical imaging, 16' field
-
ACAM - optical imaging, low-resolution spectroscopy, 8' field
Visiting instruments are mounted at the
Cassegrain or Nasmyth f/11 foci. Recent visiting instruments include
EXPO,
GHaFaS,
INTEGRAL,
PLANETPOL,
PNS,
SAURON and
ULTRACAM.
The enclosure at the spare Nasmyth focus includes an optical bench,
and can be used for experimental work, e.g. for instruments requiring
mechanical
stability.
The median
seeing
at the WHT is 0.7 arcsec. The
sky brightness
is similar to that at other good dark sites, V = 21.9 mag
arcsec2.
See the ING
astronomy,
PR,
and
home pages
for other information. Useful links:
documentation,
the ING newsletter,
fault reporting,
the service programme,
overrides,
the data archive,
observation logs,
ING staff list,
weather,
La Palma,
list of useful links.
