‘Deadly asteroid’ is a spaceprobe

An alert over a close shave by a threatening asteroid has been called off after it was found to be a passing spaceprobe called Rosetta. The alarm was raised by the Minor Planet Center, the world’s official HQ for logging newly discovered space rocks and checking for any “Near Earth Objects” that threaten a devastating impact.

An ESA artist's impression of Rosetta's flybyThey issued an email circular to professional observatories last week announcing that an asteroid had been detected that would miss the Earth by a whisker on Tuesday, November 13.

The near miss, by 5,600 km – less than half the diameter of the Earth – looked set to be one of the closest on record. The MPC, which is run by the Smithsonian Astrophysical Observatory, Massachusetts, for the International Astronomical Union, even gave the body an official label, 2007 VN84.

Detailed observations by astronomers worldwide who discover and monitor potentially deadly asteroids were used to calculate an accurate track for the incoming “missile”.

Britain’s Royal Astronomical Society was preparing a special announcement to the media on Monday to reveal one of the closest cosmic shaves with disaster ever recorded. Then one sharp-eyed scientist, Denis Denisenko, 36, of Moscow, spotted that the asteroid’s track matched that of a European comet-chasing spaceprobe called Rosetta.

The craft, which is the size of a box van, is scheduled to make a swing past Earth on Tuesday for a gravity boost to speed it like a slingshot on its ten-year journey to Comet Churyumov-Gerasimenko.

Rosetta, launched in March, 2004, by the European Space Agency (ESA) has already made one swing-by of Earth in March 2005, another past Mars in February this year, and it will pass us again in November 2009.

Ironically, the unmanned probe will also fly close to and study two minor planets, Steins and Lutetia, during two journeys through the asteroid belt in 2008 and 2010.

Denisenko emailed an online discussion group for asteroid observers revealing his discovery. Embarrassed officials at the Minor Planet Center were forced to email a fresh circular announcing: “The minor planet 2007 VN84 does not exist and the designation is to be retired.”

But they added: “This incident highlights the deplorable state of availability of positional information on distant artificial objects (whether in earth orbit or in solar orbit). A single source for information on all distant artificial objects would be very desirable.”

Despite the red faces, the MPC perform vital work and there have been very real near misses by genuinely threatening asteroids that demand monitoring. The world’s biggest digital camera recently joined the search for them.

The Rosetta probe, which is due to plant a lander on its target comet in 2014, measures 2.8 x 2.1 x 2.0 metres. Its enormous solar panel “wings” stretch 32 metres from tip to tip and each is 32 sq metres in area.

Update: Rosetta’s flyby was a complete success with the probe right on course and producing some spectacular photos of the Earth as it approached.

Our picture is an ESA artist’s impression of Tuesday’s flyby by Rosetta.

• What do you think? Skymania welcomes your comments and views. Check out our new guide to Mars too. And support this site by visiting Skymania’s stores in the USA, the UK, Canada and France. They are powered by Amazon so you can buy with confidence.

Get free Skymania news updates by email

Sign up for alerts to our latest reports. No spam ever - we promise!

You might also enjoy these posts
Humans must urgently colonise new worlds, warns Professor Stephen Hawking Leading scientist Professor Stephen Hawking warned today that the human race must urgently make plans to colonise other planets.
World’s highest telescope takes amazing picture of a band of colliding comets ALMA, the world's highest telescope, has produced a remarkable and detailed image of a ring of dusty debris encircling a young star, Fomalhaut, that lies only 25 light-years away.
Rare chance to see Mare Orientale, site of giant impact on the Moon Here is how you can see a huge impact basin on the Moon that is usually hidden on the far side.
How to see Comet Johnson in the spring night sky Here's how to see Comet Johnson, which is now on view in the night sky. It should be easy to find with binoculars, providing you have clear, dark conditions.
Amazing Hubble photo shows countless galaxies, each containing billions of stars NASA's Hubble Space Telescope has looked nearly halfway back to the beginning of the Universe to capture a cluster of galaxies, made up of billions of stars, acting as a natural te...
Spock’s home star has solar system that resembles our own Epsilon Eridani, a star known to Star Trek fans, has been identified as the home of a solar system that may resemble an early version of our own.

By Paul Sutherland

Paul Sutherland has been a professional journalist for nearly 40 years. He writes regularly for science magazines including BBC Sky at Night magazine, BBC Focus, Astronomy Now and Popular Astronomy, plus he has authored three books on astronomy and contributed to others.

3 thoughts on “‘Deadly asteroid’ is a spaceprobe

Leave a Reply

Your email address will not be published. Required fields are marked *

Comment moderation is enabled. Your comment may take some time to appear.