Van Maanen's Star
The nearest white dwarf to the Sun that
isn't part of a binary star system (Sirius
B and Procyon B are closer) and the second
white dwarf to be discovered. It lies in the constellation Pisces,
west of Delta Piscium and east of Omega Piscium, and was discovered in 1917
by the Dutch-American astronomer Adriaan van Maanen (1884–1946) who,
in comparing photographs made between 1914 and 1917, noticed the star's
high annual proper motion of 2.98".
Its relative coolness suggests that it is a very old star, perhaps near
or older than 10 billion years. Van Maanen's Star has a computed diameter
of about 18,000 km (about one and half times that of the Earth), which results
in a density of about 1.2 tons/cm³, or about 10 times the computed
density of Sirius B, the closest white dwarf.
||14.06 light-years (4.31 pc)
||R.A. 00h 49m 09.9s,
Dec. +05° 23' 19"
||van Maanen 2, Gl 001-027, GJ 35,
GCTP 160.00, LHS 7, HIP 3829