Class I gas supergiant

For other uses, see class I.

Class I
Classification:	gas supergiant
Age:	2–10 billion years
Diameter:	140,000–10 million km
Location:	cold zone/hot zone
Surface:	comprised of gaseous hydrogen compounds
Atmosphere:	zones vary in temperature, pressure, and composition

A class I gas supergiant planet, also called class 9 planet, was a planetary classification, a gas supergiant (a supergiant gas giant) planet with a very tenuous surface made up of gaseous hydrogen and hydrogen compounds. (ST reference: Star Charts)

The Klingons referred to this planet type as Q'tahL-class gas giant. (ENT episode: "Sleeping Dogs")

History and specifications

Astrometric representation of the Tephrei I (fore) and II in 2410.

In the 2150s decade, United Earth Starfleet referred to gas giants of this type as class 9 planet. In the year 2151, Captain Jonathan Archer of the United Earth ship Enterprise NX-01 told his Vulcan first officer T'Pol that none of the gas giants in his native Sol system were class 9 planets.

An Enterprise landing party attempted to rescue the Klingon bird of prey IKS Somraw, stranded in the atmosphere of such a planet. Communications officer and linguist Hoshi Sato found in the ship's database that the Klingons referred to this type of planet as Q'tahL-class gas giant. (ENT episode: "Sleeping Dogs")

Q'Tahl was a Klingon-controlled planet located near the Taurus Reach in the 2260s. Q'Tahl was the home of the Klingon 5th Battle Fleet in 2268. (VAN - Declassified novella: The Stars Look Down)

Baseras in 2411.

By 2378, Federation science referred to these as class I gas supergiant. (ST reference: Star Charts)

The ninth planet of the B'hava'el system, Baseras, was a class I supergiant. (Coda novel: The Ashes of Tomorrow)

In the 2400s, Koolhaas Prime was a class I gas supergiant in Federation space. (STO - Patrol the Risa Sector mission: "Koolhaas System Patrol")

Planets of this type

• Baseras (Bajor IX), B'hava'el system
• Koolhaas Prime, Koolhaas system
• Mandel Prime, Mandel system
• Q'tahL
• Tephrei I

Appendices

Connections

Planetary classification
numeric:	class 9 ("Q'tahL"-class)	alphabetical:	class A class A geothermal class A gas giant
class B class B geomorteus class B gas giant	class C class C geoinactive class C reducing	class D	class E
class F class F geometallic class F geocrystalline	class G class G geocrystalline class G desert	class H class H desert class H geothermal	class I class I gas supergiant ("Q'tahL"-class) class I metallic/silicate
class J class J gas giant class J moon	class K class K silicate/adaptable class K transjovian	class L	class M ("Minshara"-class) class MZ
class N class N reducing class N pelagic	class O	class P	class Q
class R	class S	class T	class Y ("Demon"-class)

References

• ST reference: Star Charts
• ENT episode: "Sleeping Dogs"

External link

• Class 9 gas giant article at Memory Alpha, the wiki for canon Star Trek.