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

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.


  • 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.
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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