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• Notes = Common name(s) or alternate name(s); comments; notable properties [for example: multiple star status, range of variability if it is a variable star, exoplanets, etc.] See also [ edit ]
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 .
58 Eridani is a main-sequence star in the constellation Eridanus. It is a solar analogue, [12] having similar physical properties to the Sun. The star has a relatively high proper motion across the sky, and it is located 43 light years distant. It is a probable member of the IC 2391 moving group of stars that share a common motion through space ...
It is an evolved red clump [12] giant star with a stellar classification of G8+ III. [3] The measured angular diameter is 2.21 mas. [13] At the star's distance, this yields a physical size of around 16 times the radius of the Sun. [6] It radiates 138 [7] times the solar luminosity from its outer atmosphere at an effective temperature of 5074 K. [8]
Tau 2 Eridani (τ 2 Eridani, abbreviated Tau 2 Eri, τ 2 Eri), formally named Angetenar / æ ŋ ˈ ɡ ɛ t ən ɑːr /, [8] [9] is a star in the constellation of Eridanus. It is visible to the naked eye with an apparent visual magnitude of 4.78. [2] The distance to this star, as determined via the parallax method, is around 187 light-years.
Delta Eridani, which is Latinized from δ Eridani, is the fifth-brightest star in the constellation of Eridanus.. The star is visible to the naked eye and has been observed to vary slightly in brightness between magnitudes 3.51 and 3.56, [2] although subsequent observations did not bear this out. [11]
The effective temperature of the outer envelope is about 8,104 K, [5] which gives the star a white hue typical of A-type stars. [20] The projected rotational velocity is a rapid 196 km s −1, [3] compared to 2 km s −1 along the Sun's equator. [21] The star is known to vary in apparent visual magnitude, ranging between 2.72 and 2.80. [22]
The star also possesses a rotating circumstellar disc, seen edge on, which makes Lambda Eri a "shell star", where the disk appears more opaque than usual. [16] Like most Be stars, Lambda Eridani emits soft X-rays. In 1993, a giant X-ray flare was observed in which the X-ray luminosity increased by a factor of six over a 39-hour period. [4]