When the Galileo spacecraft flew past Ida in 1993, no one expected to find a moon. Its discoverer recalls how it happened.
October 25, 2005
|Editor's note: On August 28, 1993, the Galileo spacecraft on its way toward Jupiter to begin a successful 8-year mission flew past asteroid 243 Ida. It was Galileo's second asteroid flyby, following an October 1991 encounter with 951 Gaspra. But Ida had a big surprise: a 1-mile-wide (1.6 kilometer) moon was found orbiting the 35-mile-diameter (56 km) main-belt asteroid. Ann Harch, an assistant science coordinator on Galileo's imaging team, discovered the moon. This is her story.|
You are currently not logged in. This article is only available to Astronomy magazine subscribers.
Already a subscriber to Astronomy magazine?
If you are already a subscriber to Astronomy magazine you must log into your account to view this article. If you do not have an account you will
need to regsiter for one. Registration is FREE and only takes a couple minutes.
Non-subscribers, Subscribe TODAY and save!
Get instant access to subscriber content on Astronomy.com!
- Access our interactive Atlas of the Stars
- Get full access to StarDome PLUS
- Columnist articles
- Search and view our equipment review archive
- Receive full access to our Ask Astro answers
- BONUS web extras not included in the magazine
- Much more!