= Extracting Materials from Titan =

Titan is (im)practically inaccessible.  High delta V to get there and come back.  Long round travel times.

Humans and their machines may someday occupy the asteroid belt between Mars and Jupiter.  Titan's nitrogen
atmosphere is a candidate source of reaction mass for thermal rockets, but Titan is a long way from Earth,
and longer way (in travel time and Hohmann semimajor axis) from the asteroid belts.

Some numbers:
||<-3>  Earth year                   ||<-2> 3.1557e7   seconds ||
||<-3>  Solar Gravitational Constant ||<-2> 1.3271e20  m³/s²   ||
||<-3> Astronomical Unit<<BR>>average earth orbit radius ||<-2> 1.496e11   meters  ||
||<-5 >  <<BR>>                                                     ||
|| Planets & || Orbit    || Period || Velocity || Escape || outer   ||
|| Asteroids || SemiM AU || Years  || km/s     || km/s   || surface ||
||<-6:>  circular approximation                                     ||
|| Earth     || 1.0      || 1.0    || 29.79    || 11.2   || N₂ O₂   ||
|| Mars      || 1.524    || 1.881  || 24.13    || 5.03   || CO₂     ||
|| 4 Vesta   || 2.362    || 3.630  || 19.34    || 0.36   || dust    ||
|| 1 Ceres   || 2.769    || 4.608  || 17.91    || 0.51   || dust    ||
|| 10 Hygiea || 3.142    || 5.568  || 16.76    || 0.21   || dust    ||
|| Jupiter   || 5.204    || 11.86  || 13.07    || 59.5   || H₂ He   ||
|| Saturn    || 9.583    || 29.46  ||  9.68    || 35.5   || H₂ He   ||
||<-6:> Satellites                                                  ||
||           || SemiM km || 24h d  || km/s     || km/s   ||         ||
|| Moon      || 384400   || 27.322 || 1.02     || 2.376  || dust    ||
|| Deimos    || 23463    || 1.263  || 1.35     || 0.006  || dust    ||
|| Titan     || 1221870  || 15.945 || 5.57     || 2.639  || N₂      ||
|| Iapetus   || 3560820  || 79.322 || 3.26     || 0.571  || H₂O ice ||

=== Hohmann Matrix ===

Earth Deimos Vesta Titan Iapetus