(formerly Seligman 505B)

Astrographical information

Milky Way Galaxy


Seligman 505



Orbital position




Rotation period

25 (6 hour day, 11 hour twilight, 8 hour night at Terminator)

Orbital period

288 days (9 Earth months and 18 Earth days)

Physical information
Planet type

Tidally-locked Terran (Eyeball Earth)


10,300~ km


36% Oxygen, 62% Nitrogen, 1% trace gases, 1% other


Unpredictable pressure systems, axial seasons, Perpetual Storm, Cyclones every score or so.



Primary terrain

Mountains, Hills, Ocean, Tundra

Surface water

37.5% (50% ice on Dark Side)

Points of interest

Meridian City Beach

Euclid Memorial

Native flora

Indigenous plant life (inedible by humans without genetic engineering)

Native fauna

Large sauropods, arboreals and aquatics.

Societal information
Native species

Humans (no dominant species has emerged)

Immigrated species

Euclid Colonists (first humans on planet, genetically altered due to two decades of plant consumption)

Primary language(s)

English, Spanish, French, Arabic, Russian, Mandarin Chinese, Hindi, Japanese, etc.


Meridian Colonial Government


21,305 (2290 census)



Major cities

Meridian City


Meridian Colonial Government



Meridian (formerly known as Seligman 505B) upon arrival in 2283.

Seligman 505 is a three planet system orbiting a M0V-type red dwarf star approximately 12.5 light-years from the planet Earth, located in the constellation Pisces. The mass of the star is 60% of the sun's while the luminosity is 7.2%. The system was a target of the Operation Exodus interstellar human continuity project.

History of observations

The star appears in many stellar catalogs as early as the 1890s.

However, it remained largely unobserved until the first extrasolar planet was discovered in 1995.

Astronomer C. Seligman studied the star looking for the tell tale signs of a planetary system during the 2000s, advancements continued well into the 2010s when the first planet was discovered which became Seligman 505A. He continued to observe the system where two more planets came to be known and identified as Seligman 505B and 505A. The news swept the world when Seligman 505B was given an E.S.I. of 0.80 becoming the nearest most habitable planet to Earth within twenty light-years.

It wasn't until the 2050s, when the Habitable Planet Imager (HaPI) was able to directly photograph the planets that the scientific community began to take greater interest in the system.

Nearly a century after the first photographs were taken of the system, Seligman 505B was identified as a target for Vikram Salam's initiative Operation Exodus. In 2165, the Konstantin Tsiolkovsky was launched en route for the system, the journey would take 126 years.

Planetary system

Companion Type Semi-major axis Orbital period Surface gravity
C (Inferno) Molten lava 0.25 AU 3 months 0.3g
B (Meridian) Eyeball Earth 0.5 AU 9 months 0.8g
A (Purgatario) Class 2: water vapor clouds 1.1 AU 13 months Unknown
Ab (Empyrean) Io-like moon of Purgatario 500,000 km from parent planet 2 days Unknown




Traces of sodium in the atmosphere give Paradiso its overall dark grey color, but it is otherwise a typical hydrogen-helium gas giant. An abundance of water vapor in the upper atmosphere account for its white clouds.


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