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Near-Miss Asteroid Is Found To Be Artificial

The Minor Planet Center, the world clearinghouse for information about newly discovered asteroids, raised the alarm last week. In an email to professional observatories, they announced that a previously unknown asteroid would miss the Earth by just 5,600 kilometers.

The newly discovered space rock was given an official label by the MPC, which is run by the Smithsonian Astrophysical Observatory, Massachusetts, for the International Astronomical Union. Observations for 2007 VN84 were collected from astronomers around the world, to track the threatening celestial body. This would be one of the closest approaches ever by a sizable asteroid - less than half the diameter of the Earth.

Then Denis Denisenko, of Moscow's Space Research Institute (IKI), made an interesting discovery. He noticed that the incoming asteroid's track matched that of the European space probe Rosetta on a scheduled flyby of Earth.

The Rosetta craft was launched from Europe's Guiana Space Center in early March of 2004; the purpose of the space probe is to place itself in low orbit around the comet Churyumov-Gerasimenko at a distance of 675 million kilometers from the sun. To get there, the billion-dollar craft will spend ten years boosting its velocity (using the gravity assist technique) with no fewer than three flybys of Earth and one of Mars.


(Rosetta on Earth fly-by)

Denisenko's discovery came none too soon; Britain's Royal Astronomical Society was preparing a bulletin for the media that would have been released on Monday.

In an editorial notice, the MPC stated:

The minor planet 2007 VN84 does not exist and the designation is to be retired.

This incident, along with previous NEOCP postings of the WMAP spacecraft, highlights the deplorable state of availability of positional information on distant artificial objects (whether in earth orbit or in solar orbit). The Distant Artificial Satellites Observations (DASO) page lists a number of such objects, but has to be updated on a fairly regular basis from five different sources and data is not always available for the timespans needed. A single source for information on all distant artificial objects would be very desirable.

This real-life story reminded me of a fictional one. In his award-winning novel Rendezvous with Rama, sf writer Arthur C. Clarke wrote about the approach of a mysterious asteroid, designated Rama:

At a rather horrifying cost, a space-probe soon to be launched from Mars ... could be modified and sent on a high-speed trajectory to meet Rama. Rama... would be in real close-up for less than a second...

The first images, from ten thousand kilometers away, brought to a halt the activities of all mankind. On a billion television screens, there appeared a tiny, featureless cylinder...

In other asteroid news:

Via 'Deadly asteroid' is a spaceprobe; take a look at the Minor Planet Electronic Circular that cleared things up.

Scroll down for more stories in the same category. (Story submitted 11/11/2007)

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