Planetary Size

From Traveller Wiki - Science-Fiction Adventure in the Far future
Jump to: navigation, search
Imperial Sunburst-Sun-IISS-Traveller.gif

Planetary Size: Worlds are classified according to their physical size.


Please see the following AAB Library Data articles for more information:


Description (Specifications)[edit]

Planetary density and size are two primary factors when determining a planet's gravity.

Planetary Size Data[edit]

The following table outlines the UWP codes for the size of a body:

Planetary Size
Code Description Diameter (Km) Expected
Gravity
Remarks
R Asteroidlet / Planetary Ring

(...around a world)

Multiple < 1 Microgravity
(0.01 G or less)
Planetary Ring (Tiny World)
D Debris 1+ < 200 Microgravity
(0.01 G or less)
Debris Field / (Tiny World)
0 Asteroid / Planetary Belt

(...around a star)

Multiple < 200 Microgravity
(0.01 G or less)
Planetoid Belt (Tiny World)
S Very Small 200-799 Very Low Gravity
(400 km, 0.02g - 0.03g)
Very Small World
1 Small 800-2399 Very Low Gravity
(1,600 km, 0.05g - 0.09g)
Small World
2 Small (e.g. Luna) 2,400-3,999 Low Gravity
(3,200 km, 0.10g - 0.17g)
Small World
3 Small (e.g. Mercury) 4,000-5,599 Low Gravity
(4,800 km, 0.24g - 0.34g)
Small World
4 Medium (e.g. Mars) 5,600-7,199 Low Gravity
(6,400 km, 0.32g - 0.46g)
Meso World
5 Medium 7,200-8,799 Standard Gravity
(8,000 km, 0.40g - 0.57g)
Meso World
6 Medium 8,800-10,399 Standard Gravity
(9,600 km, 0.60g - 0.81g)
Meso World
7 Large 10,400-11,999 Standard Gravity
(11,200 km, 0.70g - 0.94g)
Macro World
8 Large (e.g. Venus / Terra) 12,000-13,599 Standard Gravity
(12,800 km, 0.80g - 1.08g)
Macro World
9 Large 13,600-15,199 Standard Gravity
(14,400 km, 1.03g - 1.33g)
Macro World
A (10) Huge 15,200-16,799 Standard Gravity
(16,000 km, 1.14g - 1.48g)
Big World
B (11) Huge 16,800 - 18,399 High Gravity
(17,600 km, 1.49g - 1.89g)
Big World
C (12) Huge 18,400+ Very High Gravity
(17,600 km, 1.9g - 2.0g)
Big World
SGG Small Gas Giant (no futher codes) 40,000-120,000 Macrogravity
(2.01 G or higher)
Gas Giant
LGG Large Gas Giant (no further codes) 120,000-240,000+ Macrogravity
(2.01 G or higher)
Gas Giant
  • NOTE-1: Please note that the size code D ( Debris ) is non-standard. It is included to cover such cases as Comet Mid-Rift (Deneb 3234), which are less than 200Km, but not part of an asteroid belt, yet important enough to have mention.
  • NOTE-2: Please note that gravity values are estimations based on a standard planetary density. Planets with less or more dense cores may have very different values from the suggested average.

History & Background (Dossier)[edit]

When the UWP was created, any number of planetological figures were considered for inclusion. Initial discussion led to 16 and 32-factor descriptive chains, but theose were too many, especially for a Universal Code. Eventually the UWP was pared down to just eight factors. Of those eight factors, one of the most disputed was Planetary Size.

Size included many, many factors including:

  • Gravity
  • Physical measurement parameters
  • Planetary density
  • Tectonics
  • Vulcanism
  • etc.

A very unhappy compromise was eventually settled upon even though it as serious shortcomings.

Basic UWP Stats[edit]

Physical Stats (...the entire sequence):

SAH Sequence (planetology):

PGL Sequence (socioeconomics):

TL (technology):

Image Repository[edit]

No information yet available.

References & Contributors (Sources)[edit]

62px-Information icon.svg.png This article is missing content for one or more detailed sections. Additional details are required to complete the article. You can help the Traveller Wiki by expanding it.

This article was copied or excerpted from the following copyrighted sources and used under license from Far Future Enterprises or by permission of the author.