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Last updated on April 19, 2014 at 12:41 EDT

Join in the Search for SOHO’s 1,000th Comet

January 25, 2005

NASA — A new contest is challenging NASA web visitors to guess which day and at what time the Solar and Heliospheric Observatory (SOHO) spacecraft will find its 1,000th comet. Already the most prolific comet hunter in history, SOHO has discovered almost 900 comets and is on track to find its 1,000th sometime this summer.

Enter the SOHO Site to vote for the date and time that you think the record comet will be observed. The closest person to the time, either before or after the comet reaches its closest point to the Sun (perihelion), wins. Complete contest rules are explained on the link above.

Winners will be announced on our new comet page as soon as we can match the date and time with the entries. The opportunity to vote will end on May 15. We will keep our page updated so that you can keep track of how many comets have been discovered at any given time. Only one guess per person is permitted.

The closest guess will net you a package of goodies including the SolarMax DVD, a SOHO T-shirt, solar viewing glasses, and a selection of SOHO materials. Second and third place entries will receive the same package without the DVD.

In honor of the event, the SOHO team has pulled together the best images and movies of comets spotted by SOHO. The spacecraft, part of a partnership between NASA and the European Space Agency, observes the Sun from a vantage point of about 1 million miles out in space between the Sun and Earth.

It carries 12 instruments including the Large Angle Spectrometric Coronograph (LASCO), which mimics an eclipse in order to study the Sun’s corona, or outer atmosphere. As it does this job, LASCO is also able to see comets whizzing through its frame as they pass by the Sun and sometimes plunge into it.

To help you out in your guessing, here are a few key dates for SOHO comet discoveries. Teachers can use this as a real-world classroom exercise in extrapolating data and making predictions based on the evidence at hand.

Comet Number Date
100 Feb. 4, 2000
200 Aug. 31, 2000
300 Mar. 25, 2001
400 Feb. 26, 2002
500 Aug. 14, 2002
600 Apr. 29, 2003
700 Dec. 2, 2003
800 June 11, 2004
897 Jan. 13, 2005

More Information:

Watch the Sun in Real-Time from SOHO
SOHO Spots Flare Within Minutes of the New Year
Best Comet Movies from SOHO
Comet Bradfield
Two Comets Race for the Sun
Comet NEAT
Comet Kudo Fujikawa