Re: ARLA/CLUSTER: Escute em 2380 MHz os reflexos do radar de observação de asteróide no próximo dia 27 de Janeiro

[João Costa > CT1FBF]

Como se pode depreender da noticia, a passagem mais próxima da Terra
do  asteróide será a 26, mas o Radio Observatório de Arecibo só vai
emitir a 27 de Janeiro.


2015-01-21 13:25 GMT+00:00 João Costa > CT1FBF <ct1fbf  gmail.com>:
> Listen-in to 2380 MHz radar observations of asteroid
>
> On January 26, 2015 the near-Earth asteroid 2004 BL86 will pass within
> 0.008 AU of Earth (3.1 times as far away as the Moon). This will be
> the closest approach to Earth by this asteroid for at least the next
> 240 years
>
> As part of an extensive campaign of radar observations to learn about
> BL86's shape, spin state, and surface; and to refine knowledge of its
> trajectory; the Arecibo Observatory's S-band planetary radar plans to
> illuminate the asteroid with a continuous-wave signal over January 27,
> 2015 03:45 - 04:00 UTC. Over that time, BL86's radar echo will be
> received by elements of the Very Long Baseline Array and the Very
> Large Array in New Mexico. Anyone with an antenna and receiver capable
> of detecting the echo is welcome to listen in.
>
> BL86 will be above the horizon for most observers in North and South
> America, and for some parts of western Europe and western Africa. To
> readily detect its radar echo, observers should have an antenna with
> an effective collecting area of at least 10 square meters. BL86 will
> be moving rapidly across the sky. Over Jan 27 03:45 - 04:00, it will
> move by ~0.5º. The asteroid's exact position on the sky will depend on
> where it is observed from as well as the time, but will be near
> (RA,Dec) = (130º,+17º). A current ephemeris can be obtained from JPL's
> Horizons system: http://ssd.jpl.nasa.gov/?horizons
>
> The Arecibo transmission will be tuned to give a nominal echo center
> frequency of exactly 2380 MHz at geocenter. Without correction for
> Earth's rotation, BL86's radar echo will appear as slowly-drifting and
> within 15 kHz of 2380 MHz. Predicted echo frequency as a function of
> time for a given location can be obtained on-request by emailing
> Michael Busch (mbusch  seti.org). We expect an echo bandwidth of 6 Hz
> or less.
>
> Details of the BL86 radar observing campaign at the Arecibo
> Observatory, NASA's Goldstone Solar System Radar facility, and the
> National Radio Astronomy Observatory are available at
> http://echo.jpl.nasa.gov/asteroids/2004BL86/2004BL86_planning.html
>
>
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