Dated: 25 July 2004
Disc: 3 Aug. 2000 at LINEAR, New Mexico, MPEC 2000-P32
http://www.hohmanntransfer.com/cat/an4.htm#an54509
2000 PH5 was discovered by MIT's LINEAR program on 3 Aug. 2000. It is estimated from its brightness to be about 110 meters/yards across, and is described by Ondrejov Observatory's NEO program as a "superfast rotator." Radar observations were reported 27-28 July 2001 from Goldstone at 5.3 lunar distances (LD) in the midst of a Spaceguard observing campaign. It flew over (north of) Earth on 25 July 2002 at about 4.7 LD.
Paul Wiegert reported in 2001 that he and his co-authors on 3753 Cruithne research will be showing that, like Cruithne, PH5 appears to be locked into an orbital resonance with the Earth.
Earth coorbital asteroid 2002 AA29
Martin Connors, Paul Chodas, Seppo Mikkola,
Paul Wiegert, Christian Veillet, Kimmo Innanen
September 2002
http://www.astro.uwo.ca/~wiegert/AA29/AA29.html
An international team of astronomers has found that an asteroid discovered earlier this year follows Earth's orbit around the Sun and will, in nearly 600 years, appear to orbit the Earth. In the October issue of the journal Meteoritics and Planetary Science, the astronomers announce that the asteroid, named 2002 AA29, follows a "horseshoe orbit" that makes it come near the Earth every 95 years. It will next come close on January 8, 2003, although even then it will be much further away than the Moon and only detectable using large telescopes. The combination of Earth's and Sun's gravity works so that even as Earth pulls in the asteroid, it speeds up and moves away from the Earth. In this way Earth is protected from impact, despite the similarity of the asteroid's orbit to Earth's.