Mercury (SR 1827) (world)

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Mercury/Sol (Solomani Rim 1827)
Classic Era (1115)
StarportG Error in Starport Decode
Size3 Small (4,800 km, 0.24g - 0.34g)
Atmosphere0 Vacuum
Hydrographics0 Desert World 0%
Population4 Moderate (20 thousand)
Government6 Captive Government/Colony
LawA Extreme Law (no weapons)
Tech LevelE High Stellar (anti-grav cities)
See also UWP
System Details
Primary G2 V
Planetoid Belts 1
Gas Giants 4

Mercury (SR 1827) is a hellworld, with a vacuum environment in which a population is struggling to survive against an inhospitable environment.

  • Life in a vacuum requires great discipline. After all, it only takes one forgotten seal on a vacuum suit to spell death. Those who survive tend to be very methodically-minded and attentive to small detail.
  • Hellworlds often offer daily, and sometimes even hourly, life-threatening situations to their inhabitants. Survivors often form intense survival skills and tend to be grim realists.
  • A hellworld, with a vacuum environment, is that much harder to survive in. Most such hellworlds have vast temperature differentials compounded by the difficulties of living in a vacuum. Survivors tend to be especially hardened and methodical individuals.
  • This a "high technology" world with technology achievements at, near, or over technology standards for Charted Space.
  • It is a member of the Third Imperium in the Sol Subsector of Solomani Rim Sector in the Domain of Sol.

Description (Astrography & Planetology)[edit]

Mercury has the most extreme temperature ranges in the Terra system, ranging from 449°C during the day to -170°C at night.

Monostellar System[edit]

Mercury Monostellar System
Star Name Hierarchy Category Mass (Sol) Temp (K) Luminosity (Sol)

G2 V

Primary Main Sequence 1 5100 - 5900 1
Unit Diameter Min Distance Hab Zone Jump Shadow M-Drive Limit
AU 0.0093 0.08294 0.8 - 1.3 0.93 9.3
Orbit #  *  * 3 3 7

System Data[edit]

The primary of the Terra system is Sol, an ordinary yellow main sequence star. It has a luminosity of 1 Sol, a mass of 1 Sol, and a diameter of 1.391 million km. Sol retains a family of four inner rocky worlds, a stony planetoid belt, four outer gas giant worlds, and an outer ring of icy worldlets and debris:

  1. Mercury
  2. Venus
  3. Terra / Luna
  4. Mars
  5. Asteroid Belt
  6. Jupiter
  7. Saturn
  8. Uranus
  9. Neptune
  10. Pluto / Kuiper Belt
  • Mercury is the innermost of the four inner rocky worlds.
  • Mercury orbits Sol at a distance of 41.6 Solar diameters, within the star's 100 diameter safe jump limit.


Mercury is categorised an inner world. It orbits Sol at a mean distance of 0.39 AU (57.9 million km), within the inner system. It has an orbital period of 87 days 12 hours and a rotation period of 58 days 6 hours. The axial tilt is 0 degrees. Mercury has a diameter of 4,879 km, a density of 5.42 g/cm³, and a surface gravity of 0.38 G. The world is largely geologically inert. Its atmosphere is rated as Vacuum: trace amounts of atomic hydrogen and helium have been detected lying within deep surface features. It has no hydrosphere. Surface temperatures range from a maximum of 449°C in direct sunlight to a minimum of -170°C in darkness.

  • Mercury's orbit is out of alignment with the plane of the Solar system: its orbit is inclined at an angle of 7°.

Internal Structure[edit]

Mercury has an extremely hot iron-rich liquid metal core with a diameter of approximately 3,600 km. Above it is a hot mantle composed of silicates with a depth of approximately 600 km. The crust is formed of basaltic and anorthositic rocks and has a depth of between 50–100 km. The world has a weak electromagnetic field.

Geography & Topography[edit]

Total surface area: 74.8 million km². The surface of Mercury has numerous plains, ridges and low hills, including the Caloris Planitia (the largest feature on the surface, actually a gigantic crater), the Sobkou Planitia and the Borealis Planitia, the Calypso Rupes and the Paramour Rupes. Some regions exhibit heavily cratering while others are relatively crater free. The largest craters include Rembrandt, with a diameter of 715 km, and the Chao Meng-Fu crater on the south pole. Much of the surface is covered in a layer of regolith, rubble and dust. The surface is primarily shades of dark gray, with lighter patches generally indicating younger features.

Native Lifeforms[edit]

Mercury does not have native life.

History & Background (Dossier)[edit]

Mercury (SR 1827) is the innermost planet in the Terran system in Sol Subsector of the Solomani Rim.

  • In the interplanetary era, Mercury’s face was once covered with a giant solar array used to power mining facilities and energize lasers that drove early solar sail vessels.

Imperial High / Landed Nobility[edit]

Only the mainworld of a system possesses an officially appointed or landed Imperial Noble.

  • The landed nobles of this system are located at the mainworld on Terra.

World Starport[edit]

Mercury (SR 1827) has a Class G Spaceport, poor quality secondary installation for handing expected in-system traffic. It can supply a only a few amenities. There is unrefined fuel available for purchase. 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 only a downport.

World Technology Level[edit]

Mercury (SR 1827) possesses a Technology Level of TL–14 or TL-E in Hexadecimal Notation.

  • Common Communication technologies for this TL include: Early meson communicators.
  • Common Power Generation technologies for this TL include: Miniature super-batteries, early collectors, and advanced fusion plants.
  • Common Transportation technologies for this TL include:

World Government[edit]

Mercury (SR 1827) has a Captive Government or Colony. The world is ruled by an external government, there is no self-rule. A colony or conquered area. The local government is an oligarchy appointed by, and answerable only to, the external government.

World Military[edit]

No information yet available.

World Economy[edit]

No information yet available.

Trade Data[edit]

No information yet available.

World Demographics[edit]

Population 20,000

The main settlement is built into the Chao Meng-Fu crater on the south pole.

  • Other settlements include a small spaceport, mining operation and the very old Syuki Solar Observatory, now operated mainly as an astrophysical school.

World Culture[edit]

No information yet available.

Historical Data[edit]

No information yet available.

World Timeline[edit]

No information yet available.

UWP Listing[edit]

No information yet available.

Image Repository[edit]

TravellerMap (T5SS):


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