Orbital Zone

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Orbital Zone: Here for reference are the orbital zones for the various star types in Traveller.

  • This data includes the Jump Diameter limit of the star and the Gravitic Drive Limit for the star.

Description (Specifications)

These are combined tables from various sources including T5, book 6 Scouts and Mega Traveller. Additionally, the data for O class stars was obtained from a website by Landon Noll

  • A pink cell indicates the approximate size of the given star's jump shadow. Engaging a Jump drive is not safe within this area. Additionally, all incoming ships will be pulled out of jump outside of this area.
  • Cells that have a grey border are outside the star's 10 diameter limit where gravitic drives can not function.
  • A yellow cell indicates that the specified area is inside the star.
  • A dash "-" indicates that a planet will be vaporized with in that orbit, Likely a star ship as well.
  • An "I" indicates Inner Zone, "O" indicates Outer Zone and "H" indicates a habitable zone for most humanoid species.
  • An "H-" indicates a hot Habitable zone, and a "H+" indicates a colder habitable zone. These values are used in T5.

NOTE: for Stellar classifications O and B the 10D Gravitic and 100D Jump Limits had to be calculated as they are not represented on any tables.

Size IaO

The Hyper Giants table was calculated from data and can not be found in any of the Traveller source materials.

Size IaO Hyper Giants
Orbit AU O0 O5 B0 B5 A0 A5 F0 F5 G0 G5 K0 K5 M0 M5 M9
0 0.2 * * * * * * * * * * * * * * *
1 0.4 * * * * * * * * * * * * * * *
2 0.7 * * * * * * * * * * * * * * *
3 1 - - - - * * * * * * * * * * *
4 1.6 - - - - - * * * * * * * * * *
5 2.8 - - - - - - - * * * * * * * *
6 5.2 - - - - I - - - * * * * * * *
7 10 - - - - I I I I I * * * * * *
8 20 - - I I I I I I I I * * * * *
9 40 - I I I I I I I I I I I I * *
10 77 I I I I I I I I I I I I I * *
11 154 I I I I H- I I I I I I I I * *
12 308 I I I I H I I I I I I I I I *
13 615 I I H- H- H+ H H H H H- H- H- H- I *
14 1230 I H- H H O H+ H+ H+ H+ H H H H I *
15 2500 H- H H+ H+ O O O O O H+ H+ H+ H+ I *
16 4900 H H+ O O O O O O O O O O O I *
17 9800 H+ O O O O O O O O O O O O H- *
18 19600 O O O O O O O O O O O O O H *
19 39200 O O O O O O O O O O O O O H+ H
20 78400 O O O O O O O O O O O O O O H+
21 156800 O O O O O O O O O O O O O O O
22 313600 O O O O O O O O O O O O O O O

It is worth noting that the jump shadow for a M9IaO star extends out to 3.413 light years. Fortunately, these stars are very rare. For reference Orbit 21 extends beyond the System Hex, and orbit 22 nearly encompasses the surrounding hexes. These rows were left in this table to show just how big these stars are.

Size Ia

Size Ia Bright Super Giants
Orbit No. AU O0 O5 B0 B5 A0 A5 F0 F5 G0 G5 K0 K5 M0 M5 M9
1 .4 - - - - * * * * * * * * * * *
2 .7 - - - - - * * * * * * * * * *
3 1 - - - - - - - - * * * * * * *
4 1.6 - - - - - - - - - * * * * * *
5 2.8 - - - - - - - - - - * * * * *
6 5.2 - - - - - - I I - - - - * * *
7 10 - - I I I I I I I I I I I * *
8 19.6 I I I I I I I I I I I I I I I
9 38.8 I I I I I I I I I I I I I I I
10 77.2 I I I I I I I H- I I I I I I I
11 154 I I I H- H- H- H- H H- H- H- H- H- H- H-
12 307.4 I I H- H H H H H+ H H H H H H H
13 614.8 H- H- H H+ H+ H+ H+ O H+ H+ H+ H+ H+ H+ H+
14 1229.2 H H H+ O O O O O O O O O O O O
15 2458 H+ H+ O O O O O O O O O O O O O
16 4915.6 O O O O O O O O O O O O O O O

Size Ib

Size Ib Weaker Super Giants
Orbit No. AU O0 O5 B0 B5 A0 A5 F0 F5 G0 G5 K0 K5 M0 M5 M9
1 0.4 - - - - - - - - - * * * * * *
2 0.7 - - - - - - - - - - * * * * *
3 1.0 - - - - - - - - - - * * * * *
4 1.6 - - - - - - - I I - - * * * *
5 2.8 - - - - I I I I I I I - * * *
6 5.2 - - - I I I I I I I I I I * *
7 10.0 - - - I I I I I I I I I I I *
8 19.6 - - I I I I I I I I I I I I I
9 38.8 - - I I I H- H- H- H- H- H- I I I I
10 77.2 I I I H- H- H H H H H H H- H- I I
11 154.0 I I I H H H+ H+ H+ H+ H+ H+ H H H- H-
12 307.6 I I H- H+ H+ O O O O O O H+ H+ H H
13 614.8 H- H- H O O O O O O O O O O H+ H+
14 1229.2 H H H+ O O O O O O O O O O O O
15 2548.0 H+ H+ O O O O O O O O O O O O O
16 4915.6 O O O O O O O O O O O O O O O

Size II

Size II Bright Giants
Orbit No. AU O0 O5 B0 B5 A0 A5 F0 F5 G0 G5 K0 K5 M0 M5 M9
1 0.4 - - - - - - - - - - - * * * *
2 0.7 - - - - - I I I I I I - * * *
3 1.0 - - - - I I I I I I I I * * *
4 1.6 - - - - I I I I I I I I I * *
5 2.8 - - - I I I I I I I I I I * *
6 5.2 - - I I I I I I I I I I I I I
7 10.0 - I I I I H- H- H- H- H- I I I I I
8 19.6 I I I I H- H H H H H H- H- I I I
9 38.8 I I I I H H+ H+ H+ H+ H+ H H H- H- I
10 77.2 I I I H- H+ O O O O O H+ H+ H H- H-
11 154.0 I I H- H O O O O O O O O H+ H H
12 307.6 I H- H H+ O O O O O O O O O H+ H+
13 614.8 H- H H+ O O O O O O O O O O O O
14 1229.2 H H+ O O O O O O O O O O O O O
15 2548.0 H+ O O O O O O O O O O O O O O
16 4915.6 O O O O O O O O O O O O O O O

Size III

Size III Giants
Orbit No. AU O0 O5 B0 B5 A0 A5 F0 F5 G0 G5 K0 K5 M0 M5 M9
1 0.4 - - - - I I I I I I I I - * *
2 0.7 - - - - I I I I I I I I I * *
3 1.0 - - - - I I I I I I I I I * *
4 1.6 - - - I I I I I I I I I I I *
5 2.8 - - - I I I H- H- H- I I I I I I
6 5.2 - - - I I H- H H H H- H- I I I I
7 10.0 - - I I H- H H+ H+ H+ H H H- H- I I
8 19.6 - I I I H H+ O O O H+ H+ H H H- H-
9 38.8 I I I H- H+ O O O O O O H+ H+ H H
10 77.2 I I I H O O O O O O O O O H+ H+
11 154.0 I I H- H+ O O O O O O O O O O O
12 307.6 I H- H O O O O O O O O O O O O
13 614.8 H- H H+ O O O O O O O O O O O O
14 1229.2 H H+ O O O O O O O O O O O O O
15 2548.0 H+ O O O O O O O O O O O O O O
16 4915.6 O O O O O O O O O O O O O O O

Size IV

Size IV Sub Giants
Orbit No. AU O0 O5 B0 B5 A0 A5 F0 F5 G0 G5 K0 K5 M0 M5 M9
0 0.2 - - - - - I I I I I I na na na na
1 0.4 - - - - I I I I I I I na na na na
2 0.7 - - - - I I I I I I I na na na na
3 1.0 - - - I I I I I I I H- na na na na
4 1.6 - - I I I I I H- H- H- H na na na na
5 2.8 - - I I I H- H- H H H H+ na na na na
6 5.2 - - I I H- H H H+ H+ H+ O na na na na
7 10.0 - - I I H H+ H+ O O O O na na na na
8 19.6 - I I H- H+ O O O O O O na na na na
9 38.8 I I I H O O O O O O O na na na na
10 77.2 I I I H+ O O O O O O O na na na na
11 154.0 I I H- O O O O O O O O na na na na
12 307.6 I H- H O O O O O O O O na na na na
13 614.8 H- H H+ O O O O O O O O na na na na
14 1229.2 H H+ O O O O O O O O O na na na na
15 2548.0 H+ O O O O O O O O O O na na na na
16 4915.6 O O O O O O O O O O O na na na na

Size V

Size V Main Sequence
Orbit No. AU O0 O5 B0 B5 A0 A5 F0 F5 G0 G5 K0 K5 M0 M5 M9
0 0.2 - - - - I I I I I H- H- H H H+ H+
1 0.4 - - - - I I I I H- H H H+ H+ O O
2 0.7 - - - - I I I I H- H+ H+ O O O O
3 1.0 - - - I I I I H- H O O O O O O
4 1.6 - - - I I I H- H H+ O O O O O O
5 2.8 - - - I I H- H H+ O O O O O O O
6 5.2 - - I I H- H H+ O O O O O O O O
7 10.0 - I I I H H+ O O O O O O O O O
8 19.6 - I I H- H+ O O O O O O O O O O
9 38.8 I I I H O O O O O O O O O O O
10 77.2 I I I H+ O O O O O O O O O O O
11 154.0 I I H- O O O O O O O O O O O O
12 307.6 I H- H O O O O O O O O O O O O
13 614.8 H- H H+ O O O O O O O O O O O O
14 1229.2 H H+ O O O O O O O O O O O O O
15 2548.0 H+ O O O O O O O O O O O O O O
16 4915.6 O O O O O O O O O O O O O O O

Size VI

Size VI Sub Dwarf
Orbit No. AU O0 O5 B0 B5 A0 A5 F0 F5 G0 G5 K0 K5 M0 M5 M9
0 0.2 - - - - I I I I H- H- O O O O O
1 0.4 - - - - I I I H- H H O O O O O
2 0.7 - - - I I I H- H H+ H+ O O O O O
3 1.0 - - - I I H- H H+ O O O O O O O
4 1.6 - - - I I H H+ O O O O O O O O
5 2.8 - - I I H- H+ O O O O O O O O O
6 5.2 - - I I H O O O O O O O O O O
7 10 - I I H- H+ O O O O O O O O O O
8 20 I I I H O O O O O O O O O O O
9 40 I I I H+ O O O O O O O O O O O
10 77 I I H- O O O O O O O O O O O O
11 154 I I H O O O O O O O O O O O O
12 308 I H- H+ O O O O O O O O O O O O
13 615 H- H O O O O O O O O O O O O O
14 1230 H H+ O O O O O O O O O O O O O
15 2500 H+ O O O O O O O O O O O O O O

Size D

Alternatively: Size VII

Size D White Dwarf
Orbit No. AU O B A F G K M
0 0.2 na H O O O O O
1 0.4 na O O O O O O

History & Background (Dossier)

Traveller, now known as Classic Traveller, was founded in 1977 CE, a long time ago in a Galaxy not so far away... We know it's not so far away because it features Earth. It's now 2019 CE, and a world of change has occurred in the scientific fields that perform astronomy, astrography, celestial observation, space sciences, exobiology, and practically every other field involved with science fiction in one way or another. The breakneck pace of new discovers in space science, mean that it is very hard to keep an old-fashioned hard copy RPG abreast of the latest discoveries. Referees, authors, players, and fans just have to do their best to customize their game to their tastes and the latest news. [1]

References & Contributors (Sources)

This list of sources was used by the Traveller Wiki Editorial Team and individual contributors to compose this article. Copyrighted material is used under license from Mongoose Publishing or by permission of the author. The page history lists all of the contributions.
  1. ↑ Information provided to the library by Maksim-Smelchak
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