Resonant and Co-orbital Asteroids Associated with Earth

Details Resonant and Co-orbital Asteroids Associated with Earth Resonant and Co-orbital Asteroids Associated with Earth

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.p11a..04c&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #P11A-04

Statistics

6035 Orbital And Rotational Dynamics, 6200 Planetology: Solar System Objects (New Field), 6205 Asteroids And Meteoroids, 6299 General Or Miscellaneous

Scientific paper

There are presently 18 asteroids known with semimajor axis between 0.99 and 1.01 AU and thus potentially affected by resonant interaction with the Earth. Of these, 2002 AA29 and 2003 YN107 move on low-eccentricity orbits very similar to that of the Earth, with moderate inclinations of 4 and 11 degrees. These objects both have horseshoe orbits with respect to Earth and are capable of being captured as quasisatellites (which 2003 YN107 currently is). Two other objects are known to have horseshoe orbits deviating further from Earth's orbit. 54509 (2000 PH5) and short-arc object 2001 GO2 have eccentricities of about 0.2 and low inclinations. The remaining objects have eccentricity higher than 0.2 and may have high inclinations. At least one such object, 3753 Cruithne, nevertheless has a complex horseshoe-like orbit with respect to Earth. We summarize this group of objects through statistics of their orbital parameters and characterization of the nature of their interaction with Earth. We find that some of this group are suitable targets for space missions, with the known objects on very Earth-like orbits not energetically the most favorable largely due to their inclinations. Other factors than energy may be important. Relatively long periods spent near Earth when at one end of a horseshoe orbit favor mission operations, whereas the small size of objects known to date would present a targetting challenge. The objects investigated to date have shown relatively short periods of stability in their current orbits and are thus not likely primordial. They likely are recent arrivals from the asteroid belt, as is suspected to be the case for most other near-Earth asteroids.

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