Theta Eridani (θ Eri, θ Eridani) is a star in the constellation Eridanus. It has the traditional name Acamar from the Arabic آخِر النَّهْر Ākhir an-nahr which means "the end of the river". Historically, Acamar represented the end of the constellation Eridanus. Also called Al Thalim ("the Ostrich") by 15th-century Tartar astronomer Ulug Beg.
Acamar is a double star with some evidence suggesting it is part of a multiple star system. The main star, θ1 Eri, is of the spectral class A4 and has a +3.2 apparent magnitude. Its companion star, θ2 Eri, is of the spectral class A1 and has an apparent magnitude of +4.3. The angular separation of the two stars is equal to 8.3 arcseconds. Acamar's distance from Earth as measured by the Hipparcos astrometry satellite is approximately 120 light-years.
Acamar is located approximatly 120 light years from Earth.
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