Planetary Size

Worlds are classified according to their physical size (Planetary Size).

• Only Mainworlds (worlds or planets) of interest are recorded.
• e.g. Gas Giants are simply classified as Small (SGG) or Large (LGG).

Description (Specifications)

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

Planetary Size

Code	Description	Diameter (Km)	Remarks
0	Asteroid/Planetary Belt (...around a star)	Multiple < 200	Tiny World Planetesimal Planetoid Worldlet
R	Asteroid/Planetary Ring (...around a world)	Multiple < 1	Tiny World Planetesimal Planetoid
D	Debris	1+ < 200	Tiny World Planetoid Protoplanet
S	Very Small	200-799	Small World
1	Small	800-2399	Small World
2	Small (e.g. Luna)	2,400-3,999	Small World
3	Small (e.g. Mercury)	4,000-5,599	Meso World
4	Small (e.g. Mars)	5,600-7,199	Meso World
5	Medium	7,200-8,799	Meso World
6	Medium	8,800-10,399	Macro World
7	Medium	10,400-11,999	Macro World
8	Large (e.g. Venus/Terra)	12,000-13,599	Macro World
9	Large	13,600-15,199	Big World
A	Large	15,200-16,799	Big World
B	Huge	16,800+	Big World
SGG	Small Gas Giant (no futher codes)	40,000-120,000	Gas Giant
LGG	Large Gas Giant (no further codes)	120,000-240,000+	Gas Giant

• 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.

History & Background (Dossier)

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References & Contributors / Sources

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 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 Far Future Enterprises or by permission of the author. The page history lists all of the contributions.

• Marc Miller. Referee's Manual (Game Designers Workshop, 1987), .
• MegaTraveller World Builder's Handbook
• TNE World Tamer's Handbook
• Marc Miller. T5 Core Rules (Far Future Enterprises, 2013), 409,413.
• Author & Contributor: Lord (Marquis) and Master of Sophontology Maksim-Smelchak of the Ministry of Science