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- From: dreher@bkyast.berkeley.edu
- Subject: SETI Shutdown
- Summary: Sky Survey dead, Targeted Search seeks funding
- Keywords: SETI HRMS NASA
- Date: Thu, 21 Oct 93 17:45:05 PDT
-
- Last week, the Project Manager of the High Resolution Microwave
- Survey, NASA's SETI project, received formal notification from the
- NASA Administrator to shut down the HRMS project over 60 days,
- pursuant to the action by the US Congress earlier this month.
- Informed opinion is that there is almost no chance of reviving the
- NASA project for the foreseeable future.
-
- Background: The HRMS was the most ambitious SETI project to date.
- The Sky Survey segment of the Project was based at JPL and had the
- goal of searching the entire sky at all frequencies between 1 and 10 GHz
- using DSN antennas, an enormous task. For comparison, the Harvard
- META project searched the whole sky over about 2 MHz, and the
- Berkeley SERENDIP project, currently running at Arecibo, surveys ~10
- MHz over a substantial part of the northern sky. All these surveys
- suffer from relatively poor sensitivities; they fail by many orders of
- magnitude to be able to detect the emissions of planets with
- technologies similar to ours. The META project, for example, requires
- a transmitter with EIRP of 7,000,000 GW at 1000 light years (a typical
- stellar distance in an all-sky survey) to produce a candidate signal. The
- HRMS Targeted Search, run out of Ames Research Center, had a
- different strategy: with long integrations on individual stars using the
- largest antennas in the world, it would have achieved a sensitivity (at
- Arecibo) sufficient to detect an EIRP of 0.4 GW at 10 ly (a typical
- distance to a nearby star). The frequency range from 1 to 3 GHz was to
- be searched for about 1000 of the nearest selected solar-type stars.
-
- Current Status: 1) The Sky Survey has built and is using a prototype
- system at L and X band. Observations will cease. The equipment will
- be stored, probably at a DSN telescope. 2) The Targeted Search was
- deployed at Arecibo last year with a 10 MHz pre-production system.
- This system is now back at Ames, being upgraded into a 20 MHz
- production system, in preparation for deployment to the 64 meter
- Parkes antenna in Australia next year.. Unfortunately, this upgrade
- means that everything has been taken apart. We hope to be able to
- reassemble the 10 MHz system and get it into some kind of working
- condition before the shutdown completes. 3) JPL was nearing
- completion of an innovative feed/cryogenic amplifier system that
- spanned 1 to 3 GHz in just two packages. We hope to salvage some of
- this gear. 4) The HRMS was partially supporting SETI efforts at Harvard,
- Berkeley, and Ohio State; much, possibly all, of
- this funding will be lost. 5) A number of university scientists were
- being funded as part of the Investigators' Working Group; these too
- will get the ax. 6) The joint NSF/HRMS curriculum development
- project at the SETI Institute can, we hope, be saved by reprogramming
- at NASA.
-
- Future Prospects: Since the Sky Survey depends largely on NASA
- antennas and JPL personnel, prospects for the SS seem bleak. The
- Targeted Search, on the other hand, was run primarily through the
- non-profit SETI Institute (under a NASA Cooperative Agreement) and
- planned to use non-NASA telescopes, so there is still a _chance_ to do
- something. The SETI Institute has begun an emergency appeal to
- foundations and wealthy individuals to fund deployment of the
- Targeted Search. In the longer term, the Institute is seeking stable
- private funding to allow continued development and sustained use of
- SETI instrumentation, both internally and by support of external
- groups. We hope to be able to improve the sensitivity by a factor of 5-
- 10 and the search speed by a factor of 10-30 within a decade.
-
- John Dreher
- Targeted Search System Scientist
- dreher@bkyast.berkeley.edu
-
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