The cache is not located at the listed co-ordinates. There is no need to go there.
Hipparchus of Nicaea (c.190 - c.120 BC) was a Greek astronomer, geographer, and mathematician. He is considered the founder of trigonometry, but is most famous for his incidental discovery of precession of the equinoxes.
Late in his career (around 135BC) Hipparchus compiled his star catalogue, the original of which does not survive. The work started by Hipparchus has had a lasting heritage, with adoption and expansion by names such as Ptolemy, Al Sufi, and Nicholas Copernicus. The catalogue was superseded only in the late 16th century by Tycho Brahe, only thanks to superior ruled instruments and spherical trigonometry, which improved the accuracy of the observations.
The rather cumbersome formal name for a European Space Agency's Mission was the "High Precision Parallax Collecting Satellite" which provided the acronym HiPParCoS, that echoed and commemorated the name of Hipparchus. This mission was devoted to precision astrometry, the accurate measurement of the positions of celestial objects in the sky, and a legacy of its namesake.
To solve this puzzle, the cache can be loacted at:
S 35 5(60129).(68933)(25336)(30122)
E 146 5(82396).(12486)(45556)(59747)
The cache is a 200mL sistema container which contains a logbook and pencil only.
Please watch your step at GZ as there are a few rabbit holes in the area.
Good luck with your solving and finding. We hope you enjoy the experience.