System

A System or Star System is an astrographic term for a star and its family of planets and satellites.

• Also known as a Stellar System or a World-System among other terms.

Description (Specifications)

The term system denotes a major world and its associated star, plus any other planets, satellites, asteroids, and other bodies in a significant gravitational relationship with the source star.

• Also includes all bands of system including the close inner system and the far outer system of Oort clouds and orbiting comets or other astrographic objects.

Orbital Definitions

Each orbit should be understood as a generalized band into which an astronomic object such as a planet, belt, or related object may occupy. There are no set distances for each orbit or band, which are determined by the star or stars centered the system.Orbital bans are typically measured in AU or Astronomical Units and the distance between bands is variable.

Orbits:

• 1 to 6 represent the inner worlds of a system.
• Symbolic orbit 6.5 HZ, the Habitable Zone is the Goldilocks area where conventional life has the greatest odds of developing.
• 7 to 12 represent the outer worlds of a system.
• 13 to 144 represent the remote system of Kuiper Belts and Trans-Neptunian Objects.
• 145 to the edge of an astrographic hex or parsec represent the far system where Oort Clouds and the Hill Sphere is located.

Star System Locations

Includes the mainworld, satellites, and all other worlds within a system. In the case of polystellar systems, it may include all stars and their associated worlds.

Star System Locations

Type	World Band	Orbit	Distance	Location/s	Solar Region	Grav. Relationship	Remarks
Star	Very Rare	0 (zero)	Center (zero)	Star	Star	Source	Astronomic but not astrographic centerpoint.
Inner System	Inner Zone	1 to 6	Up to 42 Light Minutes	HZ Neg	Heliosphere	Significant gravity	Warmer Worlds
HZ	Goldilocks Zone	Variable (Symbolically Orbit 6.5)	Variable	HZ	Heliosphere	Significant gravity	Just right. Goldilocks Zone. Liquid water. Ideal environment for conventional life.
Outer System	Outer Zone	7 to 12	Up to 42 Light Hours	HZ Plus	Heliosphere	Significant gravity	Colder worlds.
Remote System	Rogue Worlds	13 to 144	Up to 2 Light Weeks	Remote System	Heliosphere to Heliopause to Interstellar Medium	Insignificant gravity	Kuiper Belt. Trans-Neptunian Objects.
Far System	Rogue Worlds	Orbit 145 to (3.27 parsecs)	To limits of an area of one Parsec volumetric cube	Far System	Interstellar Medium	Very weak gravity	Oort Cloud/s. Hill Sphere.

Polystellar Systems

Polystellar star systems with one to six stars can be found within Charted Space. Polystellar star systems with larger numbers of stars are considerably rarer. Polystellar systems are also known as multi-star systems for binaries and multiple-star systems for trinaries or greater.

Polystellar Star Systems

Type	# Stars	Rough %	Remarks
Monostellar Star System	1	60	Most common star system. Not a polystellar system.
Binary Star System	2	30	Common star system.
Trinary Star System	3	4 to 5	Uncommon star system.
Quaternary Star System	4	2 to 3	Infrequent star system.
Quinary Star System	5	1 to 2	Rare.
Sextenary Star System	6	N<1	Very rare.
Polystellar Star System	7+	N<0.1	Extremely rare.

History & Background (Dossier)

The IISS or its counterparts typically only have fairly comprehensive star charts for inner systems (inner zone, HZ and outer zone). Outer systems (remote and far) typically remain very roughly charted or nearly uncharted.

References & Contributors (Sources)

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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.

• MegaTraveller Imperial Encyclopedia
• Traveller: The New Era Main Rulebook (pg. 192)
• T5 Core Rules
• Author & Contributor: Lord (Marquis) and Master of Sophontology Maksim-Smelchak of the Ministry of Science