archive: Re: SETI [ASTRO] SN 1999ca in NGC 3120

Re: SETI [ASTRO] SN 1999ca in NGC 3120

Larry Klaes ( )
Fri, 07 May 1999 13:48:25 -0400

I have also read about ETI possibly using supernovae
as a way to get the attention of other civilizations
in the galaxy.

The concept is to beam signals in the direction away
from a supernova event, in the hope that astronomers
would be observing what is usually the brightest object
in the galaxy and suddenly detect the artificial signals
in the process.

One would hope, though, that there aren't ETI who
deliberately cause stars to explode in order to get
the attention of others in the galaxy.


>X-Mailer: QUALCOMM Windows Eudora Pro Version 4.1
>Date: Thu, 06 May 1999 19:26:36 -0400
>To: "Dr. H. Paul Shuch" <>
>From: "Dr. Stuart A. Kingsley" <>
>Subject: Re: SETI [ASTRO] SN 1999ca in NGC 3120
>If the signal was sufficiently strong, you could use a scanning
>spectrometer to analyze the light as a function of optical wavelength. As
>Paul correctly indicates, a pulsed laser will be relatively very narrow band.
>P.S. Wasn't the UPN SETI segment supposed to have been broadcast last night?
>At 02:57 PM 5/6/1999 -0400, you wrote:
>>At 02:42 PM 5/6/99 -0400, Larry Klaes wrote:
>>>How would we be able to tell the difference between a
>>>natural supernova event and an artificial pulsed laser
>>>beacon from an ETI?
>>I'm speculating here (he says, putting on his specs), but it is my
>>understanding that supernovae radiate over a broad spectrum, while even
>>pulsed lasers should be expected to produce relatively narrow-band
>>emissions. The real question is, can current optical receivers distinguish
>>between narrow and wideband signals? Stuart?
>>H. Paul Shuch, Ph.D., CFII, FBIS
>>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
>>Project Argus station FN11LH
>>"We Know We're Not Alone!"
>Dr. Stuart A. Kingsley, SMIEEE, MIEE, CEng. (
>Director, The Columbus Optical SETI Observatory -
>Optical SETI E-Commerce Site -
>SPIE's OSETI III Conference, Photonics West, February 19-21, 2001,
>San Jose Convention Center -
>Sky & Telescope:
>December 1998 -
>June 1999 -
>Tel: (614) 258-7402, eFax: (707) 313-2546