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Proposal Identification No.:

R2958

Date Received:

2014-Sep-01 17:44:49

Technical Page
This proposal has been submitted before. The previous proposal number is R2080/2169/2288. Proposal Type: General Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: Large Planetary Radar Solar System 54 Hours

Probing Asteroid Physics, Solar Physics, and Fundamental Physics with Radar

Astrometry
ABSTRACT:
We request 54 hours in 2015-2017 to continue a long-term radar program established in 2004. We have been quantifying non-Keplerian effects in the orbits of Near-Earth Asteroids that reach deep inside the gravitational well of the Sun with the following three ob jectives: 1) to measure Yarkovsky drift rates, which can reveal asteroid masses and thermal properties, 2) to provide a purely dynamical measurement of the solar quadrupole moment J2 , 3) to refine solar system tests of general relativity (PPN parameter at the 10-4 level). The effects are separable because they produce different signatures on the orbital evolution. The program is nearing the stage where its impact can be realized: at the end of this proposal cycle, we will have accumulated 25 observations of 10 different asteroids over a 15-year period, sufficient to provide 3 Yarkovsky rates, a meaningful estimate of , and an estimate or upper bound on J2 .

Name Jean-Luc Margot

Institution University of California, Los Angeles

E-mail jlm@astro.ucla.edu

Phone 310 206 8345

Student no

Remote Observing Request

X

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

Instrument Setup
S-band receiver Atmospheric Observation Instruments: 1


Description of Observer Equipment: Portable Fast Sampler Sp ecial Equipment or setup: none

RFI Considerations Frequency Ranges Planned

2