Re: Are there asteroids between the sun and mercury?

From: Robert Clark (rgregoryclark_at_yahoo.com)
Date: 02/02/05 

Date: 2 Feb 2005 05:51:15 -0800

tholen@antispam.ham wrote:
> Robert Clark writes:
>
> > Maybe you can answer a question about this for me Joseph. I once
asked
> > scientist involved in radio astronomy if the Sun interfered with
radar
> > signals. His answer was no, which surprised me. If this is true,
why
> > isn't radar used to search for Vulcanoids?
>
> Radar isn't used to search for anything in deep space. First of all,
> the beamwidth is too narrow to efficiently do any searching. Second
> of all, the power required goes as the fourth power of the distance.
>
> > Could the uncoming Square Kilometer (or Kilometre) Array be used
for
> > such a search?
>
> How? Radio wavelength emissions? Remember, radar is active
(transmit
> and receive), whereas radio is passive (receive only).

Radar is already used to examine NEO's. You use powerful radar
transmitters to send a signal, then use sensitive radio telescopes to
detect the return signals.
The SKA is intended to be used to detect NEO's (and potential Earth
impactors) to greater distances and smaller sizes than currently
possible using this method.
I wanted to know if it can also be used to search for asteroids close
in to the Sun.

   Bob Clark

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