Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/CartertagR1929tp.pdf Дата изменения: Sat Jul 31 00:03:16 2004 Дата индексирования: Sat Dec 22 22:31:23 2007 Кодировка: Поисковые слова: comet

Proposal Identification No.:

R1929

Date Received:

2004-Jan-31 18:34:33

Technical Page
Proposal Type: General Category: Observation Category: Total Time Requested: Prop osal Title: ABSTRACT: Regular Planetary Radar Solar System 28 Hours

A Radar Search for Regoliths on the Asteroids 11066 Sigurd and 4179 Toutatis

We prop ose radar observations of two asteroids that will pass close to Earth, with the goal of using a linear p olarization analysis to search for the presence of regolith material. If the incident radar wave refracts into a surface (such as a regolith) and is reflected by buried scatterers, the return echo will have a linearly p olarized comp onent that can b e measured using a full Stokes parameter analysis of the echo. This technique has b een successfully applied to the asteroid 1999 JM8 and we hop e to survey a large sample of asteroids to correlate the presence of regolith with asteroid size, shap e, and comp osition. Here we request observations of 11066 Sigurd and 4179 Toutatis. The size of asteroid 11066 Sigurd is not known, but its absolute magnitude suggests that it is around 4 km in diameter, which will give a signal-to-noise of around 200 p er run. Toutatis has b een observed with radar b efore, however, in 2004 it makes its closest approach to Earth b etween the years 1353 and 2562. Such a close approach will allow particularly high-resolution, high signal-to-noise imaging, ideal for the p olarization analysis.

Name Lynn M Carter

Institution Cornell University

E-mail lcarter@astro.cornell.edu

Phone (607)-257-0753

Student G

Service Observing Request

Remot e Observing Request

X

None All of the observing run. Part of the observing run. Queue Observing

X

No Maybe Yes

Instrument Setup
S-Band radar S-band receiver

Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

RFI Considerations
1


Frequency Ranges Planned

2