61

This number is a prime.

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In 1838, astronomer Friedrich Wilhelm Bessel calculated the large proper motion of 61 Cygni using trigonometric parallax. This was the first star (other than the Sun) to have its distance known from the Earth. [McGown]

Submitted: 2006-10-12 00:42:28; Last Modified: 2022-02-28 21:43:39.