Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/BlacktagR1984tp.ps Дата изменения: Mon Aug 30 23:55:01 2004 Дата индексирования: Sat Dec 22 20:58:28 2007 Кодировка: Поисковые слова: saturn's moon

Proposal Identication No.: R1984 Date Received: 2004-Jun-01 11:59:05
Technical Page
Proposal Type: Regular
General Category: Planetary Radar
Observation Category: Solar System
Total Time Requested: 30 Hours
Proposal Title: S-Band Radar Observations of the Mid-Sized Saturnian Satellites
ABSTRACT:
We propose S-band radar observations to measure the radar scattering properties of the inner mid-sized moons of
Saturn; Enceladus, Tethys, Dione, and Rhea. From optical and infrared measurements, the surfaces of these
500-1500 km diameter objects are known to be fairly clean water ice with a high albedo. Since water ice is
extremely transparent at centimeter wavelengths, measurement of radar re ectivities can indicate the presence of
additional absorbing components. A likely absorber is ammonia which is expected to be a large component of
Saturn's satellites but diфcult to observe directly. These observations extend our previous detections of Rhea and
Iapetus; the others have not been observed before. We request time near Saturn opposition in January 2005 to
maximize echo strength. At least three days per target are requested for adequate integration time, but a total of
10 days should be suфcient as pairings often make two of them observable simultaneously.
Name Institution E-mail Phone Student
Greg Black University of Vir-
ginia
gblack@virginia.edu 434-243-8941 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
S-Band radar S-band receiver
Atmospheric Observation Instruments:
Special Equipment or setup: none
RFI Considerations
1

Frequency Ranges Planned
2380
2