archiv~1.txt: Re: SETI Water Hole

Re: SETI Water Hole

Dr. H. Paul Shuch ( (no email) )
Wed, 24 Mar 1999 20:53:13 -0500

At 02:41 AM 3/25/99 +0100, SETI-Hispano wrote:

>I have read that the "Water Hole" is an extremely narrow range of radio
>frequencies between the hydrogen line of 1420 megahertz and the first
>hydroxyl line of 1662 megahertz, but The Committee on Radio Astronomy
>Frequencies (CRAF) showed 4 Hydroxyl lines.

>Can anybody say me what is the real range that owns the "Water Hole"?

When Frank Drake coined the term "Water Hole" in 1972, I believe he had in
mind the strongest of the OH lines, which is the one at 1667 MHz (I think!)
Thus we in The SETI League usually consider the water hole as extending
from 1420 to roughly 1667 MHz. Of course, it's a good idea to scan still
wider ranges of frequency, if your equipment will allow.

H. Paul Shuch, Ph.D. Executive Director, The SETI League, Inc.
433 Liberty Street, PO Box 555, Little Ferry NJ 07643 USA
voice (201) 641-1770; fax (201) 641-1771; URL
email work:; home:

"We Know We're Not Alone!"