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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.
|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.