Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/CartertagR2311tp.pdf Дата изменения: Fri Feb 9 22:20:15 2007 Дата индексирования: Sun Apr 13 03:16:37 2008 Кодировка: Поисковые слова: asteroid

Proposal Identification No.:

R2311

Date Received:

2007-Feb-01 15:51:36

Technical Page
Proposal Type: General Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Regular Planetary Radar Solar System 27 Hours 2 hr, including 1 hr setup

Radar Polarimetry of Near-Earth Asteroids

We propose S-band (12.6 cm) radar observations of the asteroids 2005 NW44, 2005 GL, and 2005 WJ56 in order to study the surface physical properties and search for the presence or absence of regolith. These asteroids make close approaches to Earth in the coming year; observations will also provide rotation rates and size measurements. If the incident radar wave refracts into a surface and is reflected by buried scatterers, the return echo will have a net linearly polarized component that can be measured using a polarimetric analysis. This technique has been used to study the lunar regolith and Venus volcanic deposits, and has been applied to the asteroids 1999 JM8 and 4179 Toutatis, both of which show evidence for a regolith. The requested observations are part of a larger pro ject to observe a sample of asteroids and correlate the radar polarimetric properties with different sizes, shapes, and compositions.

Name Lynn M Carter

Institution Smithsonian Institution

E-mail carterl@si.edu

Phone 202-633-2254

Student no

Remote Observing Request

X

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

Instrument Setup
S-Band radar S-band receiver

Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

RFI Considerations
1


Frequency Ranges Planned
2378-2382 MHz

2