Chapman, Clark R. Planetary Science Institute, Tucson, Arizona.
Last reviewed:October 2019
- Shapes, spins, and satellites
- Sizes and densities
- Surface compositions
- Surface conditions and geology
- Earth-approaching asteroids
- Origin and evolution
- Related Primary Literature
- Additional Reading
One of the many thousands of small planets (minor planets) revolving around the Sun, mainly between the orbits of Mars and Jupiter. The presence of a gap in J. A. Bode's empirical law of planetary spacings motivated a search for the missing planet. G. Piazzi discovered Ceres on January 1, 1801, and three other small planets were discovered in the next few years. Visual and photographic searches for additional asteroids have continued to the present day, augmented by electronic detection technology. Newly discovered ones are assigned a catalog number and name (such as 433 Eros) only after they are observed often enough to compute an accurate orbit. The Minor Planet Center in Cambridge, Massachusetts, maintains a file of 21 million measurements of asteroid positions. The Institute for Theoretical Astronomy in St. Petersburg, Russia, publishes an annual ephemeris of predicted asteroid positions for the over 300,000 cataloged asteroids. See also: Ceres; Planet
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Contributors include more than 10,000 highly qualified scientists and 45 Nobel Prize winners.
MORE THAN 8700 articles covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 19,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information