Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/BennertagR2662tp.pdf Дата изменения: Wed Aug 24 21:37:05 2011 Дата индексирования: Mon Feb 4 21:16:31 2013 Кодировка: Поисковые слова: carl sagan

Proposal Identification No.:

R2662

Date Received:

2011-Aug-24 12:55:26

Technical Page
Proposal Type: General Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT:
We propose three days of S-band radar observations of asteroid 1999 JU3, target of Japan's Hayabusa 2 spacecraft mission, which will return samples from this asteroid in 2020. The only opportunity to observe 1999 JU3 with radar prior to arrival by the spacecraft occurs in October, 2011, at a distance of 0.44 AU. The asteroid will be a weak target, but if we detect echoes, we hope to use the radar cross section and circular polarization ratio to constrain the asteroid's near-surface bulk density and roughness, which will have important implications for obtaining samples from the asteroid's surface.

Urgent Planetary Radar Solar System 11.75 Hours 7.5 hours over two days

Urgent Proposal for Radar Observations of Near-Earth Asteroid (162173) 1999 JU3, Target of the Hayabusa 2 Spacecraft Mission

Name Lance A. M. Benner

Institution Jet Propulsion Laboratory

E-mail lance.benner@jpl.nasa.gov

Phone 818-354-7412

Student no

Remote Observing Request

Observer will travel to AO X Remote Observing In Absentia (instructions to operator)

Instrument Setup
S-Band radar Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

RFI Considerations

1


Frequency Ranges Planned

2