Hydronaut (world)

Hydronaut/Alpha (Theta Borealis 0709)
Classic Era (1116)	E58A000-0 Starport E Frontier - no facilities Size 5 Medium (8,000 km, 0.40g - 0.57g) Atmosphere 8 Dense Hydrographics A Water World 100% Population 0 Barren (0) Government 0 No Government structure Law 0 No Law Tech Level 0 Pre-Industrial (primitive)
See also	UWP
System Details
Primary	G2 V K1 V
Planetoid Belts	3
Gas Giants	0

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Jump map from Travellermap.com

Hydronaut is a barren water world with no overt population, government, or law level.

• Its surface is 90% or more covered in an ocean of water.
• Any inhabitants of this world would need to live on the roughly 10% of exposed land mass, in underwater colonies, on city ships, or similar arrangements.
• This world could be populated if anyone had an inclination to do so...
• It is an unclaimed Non-Aligned world located in the Alpha Subsector of Theta Borealis Sector.

• This is a temperate world, with a climate of pleasant, average temperatures, considered to be an ideal or near-ideal environment by many different sophont species.
• This die back world was once settled and developed, but the inhabitants have either died off or left, leaving behind the ruins and remnants of their civilization.
• It is the former homeworld of the Halkyon, an extinct minor race.

Description (Astrography & Planetology)

Stellar Data

Hydronaut is a binary star system.

• The primary is a yellow main sequence.
• The secondary is an orange main sequence.

Hydronaut has two stars in the star system.

Hydronaut
	Type	Category		Mass (Sol)	Temperature (K)	Luminosity
	G2 V	Main Sequence (Dwarf)		1	5720 - 5770	1
	Unit	Diameter	Safe Distance	Habitable Zone	Jump Shadow	M-Drive Limit
	AU	0.0094	0.0829	0.95 - 1.68	0.94	9.4
	Orbit #	*	*	4	3	7
	Remarks		None
Hydronaut
	Type	Category		Mass (Sol)	Temperature (K)	Luminosity
	K1 V	Main Sequence (Dwarf)		0.86	5100 - 5170	0.58985
	Unit	Diameter	Safe Distance	Habitable Zone	Jump Shadow	M-Drive Limit
	AU	0.0074	0.0637	0.76 - 1.36	0.74	7.4
	Orbit #	*	*	3	2	6
	Remarks		None

System Data

The worlds of the system have been surveyed. They consist of:

• The mainworld.
• x5 secondary rocky worlds.
• x3 planetoid belts.

Mainworld Data

The mainworld orbits within the star's Habitable Zone.

• It lies within the zone's prime H region.
• It receives moderate levels of stellar energy.

Mainworld Size (S)

Hydronaut is a Meso World between 7,200km and 8,800km in diameter. The world has a standard gravity between 0.4G and 0.57G. The horizon will appear about 4km away.

Mainworld Atmosphere (A)

Hydronaut has a pressure of 1.50 to 2.49 atmospheres. A Dense Atmosphere requires no survival gear although it may be hard on sophonts not accustomed to it.

Mainworld Hydrosphere (H)

Hydronaut has 95-100% of its surface covered by liquid water with only a few islands and archipelagos. Wilderness refueling is possible. Such worlds are Water Worlds or Ocean Worlds.

Satellites:

Hydronaut retains two small vacuum moons.

• The worlds orbit once every few weeks.

Mainworld Geography and Topography

Hembree, the capital city prior to the native civilization's destruction, was located in the Feor-Naess province southwest of the Ballu Strait, on the east side of the Morgana Beach area.

The following were political-geographical divisions recognised by the extinct Halkyons:

• Aird-Sgainne Province
• Feor-naess Province
  • Hembree city
• Fermosus Province
• Heald Province
  • Village of Nave
• Hul-Dene Province
• Messana Province
• Moine-Ruadh Province

No centrally held map of the world exists within AAB Library Data records.

• Locally, detailed maps may be available.
• Verified updated charts are constantly sought.
• Detailed survey data commands premium prices.

(Placeholder chart, predominantly watery world.)

Native Lifeforms

Abundant aquatic native life occupying every available ecological niche. Its metabolic functions drive the process of atmospheric renewal.

The majority of the plants on the planet are deciduous. A few epiphytes are found in Moine-Ruadh. There is one type of carnivorous plant which grows in the unpopulated regions of Aird-Sgainne and Fernosus.

History & Background (Dossier)

Hydronaut is the former homeworld of the Halkyon, an extinct minor race.

World Starport (St)

Hydronaut has a Class E Starport, a frontier quality installation with few expected amenities. There is unrefined fuel for starships and a limited variety of ship provisions. There is no shipyard of any kind, but there may be parts and technical support for doing minor services and repair. Ports of this classification generally consist of a downport.

World Demographics (P)

Hydronaut is unpopulated.

Urbanization

Multiple ruins litter the seabed.

• Ruins are found all across the world.
• Most are buried below thick layers of silt.

World Technology Level (T)

Hydronaut possesses a Tech Level of TL–0.

• The world has no technological base.

World Government (G)

Hydronaut has no government or ruling authority of any kind.

World Military

None.

World Law (L)

Hydronaut has no law level. No laws of any kind are enforced.

World Economy

• Resources: 2 (very scarce)
• Labor: 0 (unpopulated)
• Infrastructure: 0 (none)
• Efficiency: -5 (extremely poor)

Trade Data

• Importance: -3 (very unimportant)

World Culture

• Homogeneity: 0 (none)
• Acceptance: 0 (none)
• Strangeness: 0 (none)
• Symbols: 0 (none)

World Timeline

• 300-420: the First Survey charts the system.
• 995-1065: the Second Survey charts the system.
• 1065: the Second Survey is published.

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 Mongoose Publishing or by permission of the author. The page history lists all of the contributions.

• Bill Bledsaw. Theta Borealis Sector (Group One, 1981), .
• J. Andrew Keith, Marc Miller, John Harshman. Aslan (Game Designers Workshop, 1984), IBC. (sector named but no further data)
• Peter G. Celella, James Holden. Solomani & Aslan (Digest Group Publications, 1991), 50, 51. (sector named, dot map provided)
• EXTERNAL LINK: Goerge.com
• Author & Contributor: Jo Grant of CORE (generated data)
• Author & Contributor: Graham2001
• Author & Contributor: Lord (Marquis) and Master Scout Emeritus Adie Alegoric Stewart of the IISS