Hermes data:
110 tons, accel is 2 mm/s^2
Made a timeline for both the movie and the book, in case anyone wanted to write stories in them:
Movie:
Sol Event
18 Storm arrives, Whatney is hit, left behind
19 Makes record of being alive
Sol Event
-124 July 7, 2035 Hermes leaves earth
0 November 7, 2035 (Hermes arrives at Mars, a trip of 124 days and 150 million miles)
6 Storm arrives, Whatney thought dead