Eris
This is the 15th cache in a series that creates the model of the Solar System with objects all within the boundaries of Contra Costa and Alameda Counties. This was created in response to concerns about the distance needed to travel for the Vgr1 and Vgr2 series of caches placed during the summer of 2009.
The Sun for the Pnr Solar System Model is located at the west end of Sun Crest Drive in Antioch, CA and is named Pnr - Sun. Objects are placed at a distance from Pnr - Sun relative to their average orbital distance (+/- 5%). The scale used is 1,500 feet for every Astronomical Unit. An Astronomical Unit is the average distance between the Sun and the Earth. With this scale, Neptune, the farthest planet, is in the range of 8.5 to 8.6 miles distant. Eris, the farthest dwarf planet, is in the range of 17.3 to 21.1 miles distant. Sorry folks, Pluto is now classified as a dwarf planet and is in the range of 10.1 to 12.3 miles distant.
The cache log sheet contains a number associated with the coordinate code letter "h". You should record this number. If you find all 15 object caches (the sun, the 8 planets, the 5 dwarf planets, and the asteroid belt), this number will help you find the caches named after the spacecraft.
Please consider visiting the other caches in the Pnr Solar System Model. This link will take you to a list of the Pnr caches. You may also pick from the table below.
If you do your homework, it is possible to do this entire series in one (long) day. The total round trip from the Pnr - Sun cache to the Pnr - Pioneer 11 (February 2012) cache is some where between 150 - 250 miles, depending on your route, how often you double back for missed turns, find other caches, etc.
For more information on Eris, visit its Wikipedia description.
For more information on the Solar System, visit its Wikipedia description.
For more information on the Pioneer 10 & Pioneer 11 spacecraft, visit their Wikipedia descriptions.
The idea was inspired by TeamJiffy's great series I finished at the end of 2008; Northern CA Solar System Model: Comet Halley