Sirius is a star system and the brightest star in the Earth's night sky. What the naked eye perceives as a single star is a binary star system, consisting of a white main-sequence star and a faint white dwarf companion called Sirius B.
Sirius appears bright because of its intrinsic luminosity and its proximity to Earth. At a distance of 2.6 parsecs (8.6 ly) the Sirius system is one of Earth's near neighbours. Sirius is gradually moving closer to the Solar System, so it will slightly increase in brightness over the next 60,000 years.
Sirius is also known colloquially as the "Dog Star", reflecting its prominence in its constellation, Canis Major (Greater Dog).[18] The heliacal rising of Sirius marked the flooding of the Nile in Ancient Egypt and the "dog days" of summer for the ancient Greeks, while to the Polynesians in the Southern Hemisphere the star marked winter and was an important reference for their navigation around the Pacific Ocean.
Some say there is convincing evidence that the Egyptian, Sumerian, and Dogon civilizations were founded by aliens from the Sirius star system.
This cache is not an easy grab and will require some significant physical exersion.