Traveller T20 Subsector

[Tom Kalbfus]

While we're on the subject of Terra, these are the important stats of the Terran system:
System Star Type Size (km) Color Spectral Class
Primary Dwarf 1391400 Yellow G2 V
Sol Orbital Distances
Orbit No. Name # moons gigameters (Gm) light seconds (ls) Orbital Period
0 29.9 100 33 days
1 Mercury 0 B300711-F 59.8 199 92 days
2 Venus 0 B8D8672-F 104.7 349 214 days
3 TERRA 1 A867943-F N S 149.6 499 365 days
4 Mars 2 B453772-F 239.3 798 739 days
5 Ceres 0 B000771-F PB 418.9 1,396 1,711 days
6 Jupiter 5 LGG 777.9 2,593 12 years
7 Saturn 11 LGG 1,495.9 4,986 32 years
8 Uranus 6 SGG 2,932 9,773 87 years
9 Neptune 2 SGG 5,804 19,347 242 years
10 Pluto 1 B000771-F PB 11,548 38,493 678 years

Primary Planet Type Size (km)
Planet Terrestrial 12,742
TERRA Orbital Distances
Orbit No. Name kilometers (km) light seconds (ls)
0 6,500 0.02 1.45 hours
1 13,000 0.04 4.09 hours
2 19,500 0.07 7.51 hours
3 26,000 0.09 11.57 hours
4 32,500 0.11 16.17 hours
5 39,000 0.13 21.25 hours
6 45,500 0.15 26.78 hours
7 52,000 0.17 1.36 days
8 58,500 0.20 1.63 days
9 65,000 0.22 1.91 days
10 71,500 0.24 2.20 days
11 78,000 0.26 2.50 days
12 84,500 0.28 2.82 days
13 91,000 0.30 3.16 days
14 97,500 0.33 3.50 days
15 130,000 0.43 5.39 days
20 162,500 0.54 7.53 days
25 195,000 0.65 9.90 days
30 227,500 0.76 12.47 days
35 260,000 0.87 15.24 days
40 292,500 0.98 18.19 days
45 325,000 1.08 21.30 days
50 357,500 1.19 24.57 days
55 Luna B200743-F 390,000 1.30 28.00 days
60 422,500 1.41 31.57 days


Primary Planet Type Size (km)
Planet Terrestrial 6,779 0.107
Mars Orbital Distances
Orbit No. Name kilometers (km) light seconds (ls)
0 3,500 0.01 1.75 hours
1 7,000 0.02 4.94 hours
2 Phobos BS00543-F 10,500 0.04 9.08 hours
3 14,000 0.05 13.97 hours
4 17,500 0.06 19.53 hours
5 21,000 0.07 25.67 hours
6 Deimos BS00543-F 24,500 0.08 32.35 hours
7 28,000 0.09 0.54 days
8 31,500 0.11 0.64 days
9 35,000 0.12 0.75 days

Primary Planet Type Size (km)
Planet Large Gas Giant 139,822
Jupiter Orbital Distances
Orbit No. Name kilometers (km) light seconds (ls)
0 70,000 0.23 2.87 hours
1 140,000 0.47 8.11 hours
2 210,000 0.70 14.89 hours
3 280,000 0.93 22.93 hours
4 350,000 1.17 1.34 days
5 Io B200742-F 420,000 1.40 1.76 days
6 490,000 1.63 2.21 days
7 560,000 1.87 2.70 days
8 630,000 2.10 3.22 days
9 Europa B20A732-F 700,000 2.33 3.78 days
10 770,000 2.57 4.36 days
11 840,000 2.80 4.96 days
12 910,000 3.03 5.60 days
13 980,000 3.27 6.26 days
14 Ganymede B30A742-F 1,050,000 3.50 6.94 days
15 1,400,000 4.67 10.68 days
20 Callisto B30A743-F 1,750,000 5.83 14.93 days
25 2,100,000 7.00 19.63 days
30 2,450,000 8.17 24.73 days
35 2,800,000 9.33 30.21 days
40 3,150,000 10.50 36.05 days
45 3,500,000 11.67 42.23 days
50 3,850,000 12.83 48.72 days
55 4,200,000 14.00 55.51 days
60 4,550,000 15.17 62.59 days