An Etymological Dictionary of Astronomy and Astrophysics

A region in the sky lying roughly between the → pointer stars
of the → Big Dipper that is almost free from → neutral hydrogen gas in the → Galaxy. It is centered at R.A. 10h 45m, Dec. +57° 20’, has
an area of 15 square degrees, and a → column density of N_{H I} ≤ 5 x 10¹⁸ cm^-2.
The Lockman hole is one of the favorite directions for obtaining a clear and unobstructed view of objects in deep space, far beyond our own Galaxy.

See also: Named after Felix J. Lockman et al., 1986, ApJ 302, 432; → hole.