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 – its distance away being 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.
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 space probe; take a look at the Minor
Planet Electronic Circular that cleared things up.
(This Science Fiction in the News story used with
permission of Technovelgy.com – where
science meets fiction)
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