Magnetosphere of Jupiter By 1973 the magnetic moment was known within a factor of two, whereas the tilt was correctly estimated at about 10°. The modulation of Jupiter's DAM by Io (the so-called Io-DAM) was discovered in 1964, and allowed Jupiter's rotation period to be precisely determined. The definitive discovery of the Jovian magnetic field occurred in December 1973, when the Pioneer 10 spacecraft flew near the planet. As of 2009 a total of eight spacecraft have flown around Jupiter and all have contributed to the present knowledge of the Jovian magnetosphere. The first space probe to reach Jupiter was Pioneer 10 in
Probe NCG 8436 Probe NCG 8436 Probe NCG 8436 is a 1981 role-playing game adventure for "Space Opera" published by Fantasy Games Unlimited. "Probe NCG 8436" is an adventure that concerns a survey mission to an uncharted system some 57 light-years from the Martigan system in the Procyon subsector. William A. Barton reviewed "Probe NCG 8436" in "The Space Gamer" No. 48. Barton commented that "Overall [...] "Probe NCG 8436" has enough potential to provide some intriguing adventure sessions for "Space Opera" play. While not as exciting an adventure as the recent "Alien Base", it is far superior to the earlier "Martigan Belt"."