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Constellations

Eridanus

The River

Eridanus is a constellation in the southern celestial hemisphere. Its name represents a mythical river.

The same name was later taken as a Latin name for the real Po River and also for the name of a minor river in Athens.

Eridanus is one of the 48 original Ptolemaic Constellations.

One of the stars in this constellation, Epsilon Eridani, is only 10.5 light years away from our sun, making it the third closest individual star or star system visible to the unaided eye from Earth.

Eridanus in the Night Sky
The brightest star in the constellation is Achernar, derived from the Arabic from the Arabic akhir al-nahr, which means "the riverís end." During Ptolemy's time, the constellation ended at what is now θ Eri. Back then, that star was called Achenar. After more of the southern sky was discovered in the 16th century, the constellation was extended and θ Eri was renamed Acamar.
This section describes the constellation as it is seen in the night sky.

For myth and star lore about Eridanus, click here.

Star maps based on map provided by Sea & Sky

The stars of Eridanus

Number Desig-
nation
Name
Number Desig-
nation
Name
1 α Achernar
15 τ3 Tau3 Eridani
2 β Cursa
16 ι Iota Eridani
3 γ Zaurak
17 τ6 Tau6 Eridani
4 θ Acamar
18 κ Kappa Eridani
5 δ Rana
19 τ5 Tau5 Eridani
6 τ4 Tau4Eridani
20 π Pi Eridani
7 χ Chi Eridani
21 ο2 / 40 Keid
8 ε Ran, Sadira, Epsilon Eridani
22 τ1 Tau1 Eridani
9 υ2 Theemin
23 υ1 Upsilon1 Eridani
10 η Azha
24 τ9 Tau9 Eridani
11 53 Sceptrum
25 τ8 Tau8 Eridani
12 ν Nu Eridani
26 τ2 Angetenar
13 μ Mu Eridani
27 ζ Zibal
14 ο1 Beid

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