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Epsilon Eridani, 18 Eridani

Proper NameRan
Bayer DesignationEpsilon Eridani
Flamsteed Number18 Eridani
HR (BSC)1084
Right Ascension3h 32m 56s
Declination-9° 27' 30"
Distance10.5 light years
3.2 parsecs
MagnitudeApparent: +3.73
Absolute: +6.19
Spectral ClassK2V orange dwarf
Planets in this systemÆgir (Ran b, Epsilon Eridani b), gas giant or brown dwarf
Ran c (Epsilon Eridani c), theoretical unconfirmed exoplanet
Optimum VisibilityNovember / December
NotesEpsilon Eridani, formally named Ran, is a variable star of the BY Draconis type, with extensive starspots on its surface causing its brightness to change as it rotates. It is surrounded by three separate circumstellar discs, and is orbited by a massive object named Ægir, probably a gas giant planet, at a distance of some 3.5 AU.

Imagery provided by Aladin sky atlas

Image of Ran, or Epsilon Eridani

Among the dustlanes surrounding Ran lurks its companion Ægir, a gas giant planet or possibly a brown dwarf, as shown here.

An orange dwarf star in the northern parts of Eridanus, the River. Ran, perhaps better known by its Bayer designation of Epsilon Eridani, is a faint dwarf star, much less luminous than the Sun, and most notable for its proximity to the Solar System - it is just 10.5 light years away.


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