|
Size: 1297
Comment:
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Size: 1446
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 11: | Line 11: |
| || Astronomical Unit || 1.496e11 meters || average earth orbit radius || || Earth year || 3.1557e7 seconds || || Solar Gravitational Constant || 1.3271e20 m³/s² || |
||<-3> Astronomical Unit ||<-2> 1.496e11 meters || average earth orbit radius || ||<-3> Earth year ||<-2> 3.1557e7 seconds || ||<-3> Solar Gravitational Constant ||<-2> 1.3271e20 m³/s² || ||<-5 > || |
| Line 25: | Line 25: |
| ||<-5:> Satellites || |
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:
Astronomical Unit |
1.496e11 meters |
average earth orbit radius |
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Earth year |
3.1557e7 seconds |
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Solar Gravitational Constant |
1.3271e20 m³/s² |
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Planets & |
Orbit |
Period |
Velocity |
Escape |
|
Asteroids |
Radius AU |
Years |
km/s |
km/s |
|
circular approximation |
|||||
Earth |
1.0 |
1.0 |
29.79 |
11.2 |
|
Mars |
1.524 |
1.881 |
24.13 |
5.03 |
|
Vesta |
2.362 |
3.630 |
19.34 |
0.36 |
|
1 Ceres |
2.769 |
4.608 |
17.91 |
0.51 |
|
10 Hygiea |
3.142 |
5.568 |
16.76 |
0.21 |
|
Jupiter |
5.204 |
11.86 |
13.07 |
59.5 |
|
Saturn |
9.583 |
29.46 |
9.68 |
35.5 |
|
Satellites |
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