ARLA/CLUSTER: Re: [CT-Com. & Tec.] Opurtunidade de se fazerem contactos Terra-Asteroide-Terra.

[César Vieira]

Caro João
Obrigado pela infornação.
Estarei atento nos 2Ghz.
73's
César
ct1wb

2011/8/29, João Gonçalves Costa <joao.a.costa  ctt.pt>:
> Near-earth asteroid fly-by receiving opportunity
>
> The 400 meter diameter near-Earth asteroid 2005 YU55 will be making a 0.85
> lunar distance flyby of Earth on November 8.
>
> Michael Busch at the UCLA Department of Earth and Space Sciences notes this
> may an opportunity for amateur satellite operators to observe the fly-by.
>
> UCLA will be conducting an extensive campaign of radar observations with the
> Arecibo Observatory, the Deep Space Network Goldstone facility, and the
> Green Bank Telescope and the Very Long Baseline Array.
>
> Because YU55 will be so close to Earth, its radar echo will be
> detectable with even small antennas (~1 m^2). YU55's echo will be a slowly
> drifting signal with a bandwidth of ~1 Hz within a few kHz of 2380 MHz or
> 8560 MHz.
>
> This will present amateur radio operators an opportunity to receive the
> radar reflections off of the asteroid because of the big dish, big signals
> originating from Arecibo and Goldstone.
>
> On November 8, 2011, 19:15 - 19:30 UTC, Arecibo will be transmitting a
> continuous wave tuned to put the asteroid's echo at a constant 2380.000000
> MHz at the Green Bank Telescope. Observers elsewhere on Earth will see the
> echo within 2 kHz of 2380 MHz, Doppler-shifted by the Earth's rotation. It
> will be slowly drifting in frequency and have a bandwidth of ~0.6 Hz.
>
> On November 9, 2011, 01:30 - 02:00 UTC, the Goldstone Deep Space Network
> facility will be be transmitting a continuous wave tuned to put the
> asteroid's echo a constant 8560.000000 MHz at a second antenna at the
> Goldstone site. Other observers may see the echo shifted by as much as 6
> kHz, and it will have a bandwidth of ~2 Hz.
>
> Initial information can be found on-line at:
> http://echo.jpl.nasa.gov/asteroids/2005YU55/2005YU55_planning.html
>
> More details will be announced as the fly-by date approaches.
>
> Fonte: Amsat News, Michael Busch, UCLA Department of Earth and Space
> Sciences
>
> --
> Para mais informações/opções visite o site, e edite a sua conta:
> http://groups.google.com/group/ct-comunicacoes-e-tecnologias?hl=en?hl=pt-PT
>