  In order to obtain high precision CCD positions of Himalia, the sixth Jovian
satellite, a total of 598 CCD observations have been obtained during the years
2015-2016. The observations were made by using the 2.4 m and 1 m telescopes
administered by Yunnan Observatories over 27 nights. Several factors which
would influence the positional precision of Himalia were analyzed, including
the reference star catalogue used, the geometric distortion and the phase
effect. By taking advantage of its unprecedented positional precision, the
recently released catalogue Gaia DR1 was chosen to match reference stars in the
CCD frames of both Himalia and open clusters which were observed for deriving
the geometric distortion. The latest version of SOFA library was used to
calculate the positions of reference stars. The theoretical positions of
Himalia were retrieved from the Jet Propulsion Laboratory Horizons System which
includes the satellite ephemeris JUP300, while the positions of Jupiter were
based on the planetary ephemeris DE431. Our results showed that the means of
observed minus computed (O-C) residuals are 0.071 and -0.001 arcsec in right
ascension and declination, respectively. Their standard deviations are
estimated at about 0.03 arcsec in each direction.
