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54 Eridani
Star in the constellation Eridanus From Wikipedia, the free encyclopedia
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54 Eridani is a suspected astrometric binary[10] star system located around 400 light years from the Sun in the equatorial constellation of Eridanus. It is visible to the naked eye as a faint, reddish hued star with a baseline apparent visual magnitude of 4.32.[3] The object is moving closer to the Earth with a heliocentric radial velocity of −33 km/s.[3]
The variability of 54 Eridani was announced by Benjamin Apthorp Gould in his Uranometria Argentina, published in 1879.[11] But it was not given its variable star designation, DM Eridani, until nearly 100 years later, in 1973.[12] The visible component is an aging red giant star, currently on the asymptotic giant branch,[4] with a stellar classification of M3/4 III.[5] It is a semiregular variable star of subtype SRb, ranging in magnitude from 4.28 down to 4.36.[7] The star has pulsation periods of 18.8 and 45.5 days, each with an amplitude of 0.019 in magnitude.[1] With the hydrogen at its core exhausted, the star has expanded to around 69[2] times the Sun's radius and it is radiating 1,021[2] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,915 K.[2]
It was the second-brightest star in the obsolete constellation of Sceptrum Brandenburgicum after 53 Eridani.
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