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40 Eridani is the system's Flamsteed designation and ο² Eridani (Latinised to Omicron 2 Eridani) its Bayer designation.The designations of the sub-components – 40 Eridani A, B and C – derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).
39 Eridani is a binary star also divisible in small amateur telescopes, 206 light-years from Earth. The primary is an orange-hued giant star of magnitude 4.9 and the secondary is of magnitude 8. 40 Eridani is a triple star system consisting of an orange main-sequence star, a white dwarf, and a red dwarf. The orange main-sequence star is the ...
ο Eridani (Latinised as Omicron Eridani) refers to 2 distinct star systems in the constellation Eridanus: Omicron 1 Eridani (ο 1 Eridani), or 38 Eridani, with traditional name "Beid" Omicron 2 Eridani (ο 2 Eridani), better known as 40 Eridani , with traditional name "Keid"
The other ship indicates that its home system in 40 Eridani is also plagued by Astrophage infection. Blip-A docks with Hail Mary, and the two ships establish first contact. Grace develops a system to communicate with the spider-like five-legged alien, whom Grace names "Rocky" due to its stone-like exoskeleton.
Theta Eridani, Latinized from θ Eridani, is a binary system in the constellation of Eridanus with a combined apparent magnitude of 2.88. [6] Its two components are designated θ 1 Eridani , formally named Acamar / ˈ æ k ə m ɑːr / (the traditional name of the system), [ 13 ] [ 14 ] and θ 2 Eridani .
Eta Eridani (η Eridani, abbreviated Eta Eri, η Eri), officially named Azha (with a silent 'h', possibly / ˈ eɪ z ə /), [8] [7] is a giant star in the constellation of Eridanus. Based on parallax measurements taken during the Hipparcos mission, it is approximately 137 light-years from the Sun .
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Beta Eridani is the star's Bayer designation. It has the traditional name Cursa [4] [9] derived from Al Kursiyy al Jauzah, "the Chair (or "Footstool") of the Central One". This is the name of the star association consisting of this star along with Lambda Eridani, Psi Eridani and Tau Orionis. [12]