apply for time
with the following
on the 4.2-m William Herschel Telescope:
ISIS - single-slit spectroscopy, R < 10000, 4' slit,
LIRIS - IR spectroscopy, R < 4000, and imaging (including imaging
polarimetry), 4' field
ACAM - optical imaging, low-resolution spectroscopy, 8' field
Prime-focus imager - optical imaging, 16' field
AF2/WYFFOS - multi-object fibre-fed spectroscopy, R < 9000, 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)
Visiting instruments are mounted at the
Cassegrain or Nasmyth f/11 foci. Recent visiting instruments include
AOLI, CANARY, EXPO,
SAURON, SPIFS, TRIFFID and
The enclosure at the spare Nasmyth focus includes an optical bench,
and can be used for experimental work, e.g. for instruments requiring
Targets with significant proper motion (e.g. comets) can be observed
with differential tracking.
at the WHT is 0.7 arcsec. The dark-of-moon
sky brightness at high ecliptic latitude
is similar to that at other good dark sites, V ~ 21.9 mag
The CANARY laser guide star is currently in use at the WHT
during a few nights
During these nights, the risk of collisions with the pointing
of other telescopes can be queried via the
laser traffic control system pages.
2013 August: WHT lower dome shutter is now again operational.
2013 February: Differential tracking with autoguiding is now available,
but is not compatible with some dither/nodding scripts.
Observers interested in dithered, autoguided, observations of a moving target
should contact ING.
2013 January: Vignetting at low elevation: the WHT
lower dome shutter is currently (and probably until July 2013)
out of action, and observations at
elevation < 25 deg will be vignetted