Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/CartertagR2105tp.ps Дата изменения: Fri Aug 5 21:08:25 2005 Дата индексирования: Sat Dec 22 22:04:08 2007 Кодировка: Поисковые слова: regolith

Proposal Identification No.: RR2105 Date Received: 2005­Jun­01 09:47:49
Technical Page
Proposal Type: Regular
General Category: Planetary Radar
Observation Category: Solar System
Total Time Requested: 13 Hours
Proposal Title: A Radar Search for Regolith on the Asteroid 2004 VG64
ABSTRACT:
We propose S­band (12.6 cm) radar observations of the near­Earth asteroid 2004 VG64 in order to search for the
presence or absence of regolith and to study the surface physical properties. If the incident radar wave refracts into
a surface (such as regolith) and is reflected by buried scatterers, the return echo will have a linear­polarized
component that can be measured using a full Stokes parameter analysis of the echo. This technique has been
successfully applied to the asteroids 1999 JM8 and 4179 Toutatis, and the requested observations are part of a
larger project to obtain data for a sample of asteroids and correlate the radar polarimetric properties with di#erent
sizes, shapes, and perhaps compositions. The size and rotation period of 2004 VG64 are not known, but its
absolute magnitude suggests that it is about 1 km in diameter. The asteroid comes within 0.044 AU of Earth,
which will provide the high signal­to­noise ratios needed for the polarimetric analysis.
Name Institution E­mail Phone Student
Lynn M Carter Smithsonian Institu­
tion
carterl@si.edu 202­633­2254 no
Service Observing Request Remot e Observing Request
X None X No
All of the observing run. Maybe
Part of the observing run. Yes
Queue Observing
Instrument Setup
S­Band radar S­band receiver
Atmospheric Observation Instruments:
Special Equipment or setup: none
RFI Considerations
1

Frequency Ranges Planned
2378­2382
2