  We present high-precision JHK photometry with the 3.8m UK Infrared Telescope
(UKIRT) of 83 standard stars, 28 from the widely used preliminary list known as
the "UKIRT Faint Standards" (Casali & Hawarden, 1992), referred to here as the
Fundamental List, and 55 additional stars referred to as the Extended List. The
stars have 9.4<K<15.0 and most should be readily observable with imaging array
detectors in normal operating modes on telescopes of up to 10m aperture. Many
are accessible from the southern hemisphere. Arcsec-accuracy positions (J2000,
Epoch ~1998) are given, together with optical photometry and spectral types
from the literature, where available, or inferred from the J-K colour. Finding
charts are provided for stars with proper motions exceeding 0.3"/yr. On 30
nights between late 1994 and early 1998 the stars from the Fundamental List,
which were used as standards for the whole programme, were observed on an
average of 10 nights each, and those from the Extended List 6 nights. The
average internal standard error of the mean results for K is 0.005 mag; for J-H
it is 0.003 mag for the Fundamental List stars and 0.006 mag for the Extended
List; for H-K the average is 0.004 mag. The results are on the natural system
of the IRCAM3 imager, which used a 256x256 InSb detector array with "standard"
JHK filters, behind gold-coated fore-optics and a gold- or silver-dielectric
coated dichroic. We give colour transformations onto the CIT, Arcetri and
LCO/Palomar NICMOS systems, and preliminary transformations onto the system
defined by the new Mauna Kea Observatory filter set.
