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Proposal Identi cation No.: R1538 Date Received: 2001-May-31 20:09:45
Technical Page
Proposal Type: Regular
General Category: Planetary Radar
Observation Category: Solar System
Total Time Requested: 92 Hours
Proposal Title: S-Band Radar Observations of Titan and Iapetus in 2001
ABSTRACT:
Time is requested for S-Band radar observations of Titan to be made near opposition of the Saturn system in
November/December 2001 and observations of Iapetus to be made in January 2002. Sixteen observing sessions are
requested to measure the radar scattering properties of Titan at 22.5 ф intervals in longitude. Our Arecibo radar
observations of Titan in 1999 provided the rst 12.6 cm detection of Titan and allowed estimates of its mean cross
section, circular polarization ratio and scattering law. Observations in 2000 with higher sensitivity covered
approximately 180 ф of longitude. The results from the 2000 observations indicate that Titan's cross section may be
relatively uniform except for the longitudes of the bright near-IR feature. They also strongly suggest that the radar
echo from Titan has both a specular and a di use component. This result, if real, could have signi cant
implications for current models of Titan's surface.The proposed observations would be aimed at verifying existence
of function of longitude. They are also aimed at investigating the scattering properties of the bright IR feature near
120 ф longitude. We are requesting four days of observations of Iapetus in January as follow up on a possible
marginal detection obtained in 2000. Improvements in the sensitivity of the Arecibo radar system should make the
proposed observations of Titan and Iapetus 1.5 to 2.0 times more sensitive than those of 2000.
Name Institution E-mail Phone Student
Don Campbell Cornell/NAIC campbell@astrosun.tn.cornell.edu 607 255-9580 no
I do NOT want to do remote observing.
Instrument Setup
S-Band radar S-band receiver
Atmospheric Optical Instruments:
Special Equipment or setup: none
RFI Considerations
Frequency Ranges Planned
2380 MHz
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