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Table of Contents Enchanted Learning
All About Astronomy
Site Index
Our Solar System Stars Glossary Printables, Worksheets, and Activities
The Sun The Planets The Moon Asteroids Kuiper Belt Comets Meteors Astronomers

ASTEROIDS
Introduction Near-Earth Asteroids
(NEA)
Asteroids and Dinosaurs List of Some Asteroids Composition Activities,
Web Links

Asteroids

Asteroid Name and Number* Diameter (km) Mass (kg) Mean Distance from the Sun (km) Orbital Period Discoverer, Date of Discovery
1. Ceres 960 x 932 8.7 x 1020 4.139 x 108 km 4.60 years Piazzi, 1801
2. Pallas 570 x 525 x 482 km 3.18 x 1020 4.145 x 108 km 4.61 years Heinrich Olbers, 1802
3. Juno 240 km 2.0 x 1019 2.7 AU 4.36 years K. Harding, 1804
4. Vesta 530 km 3.0 x 1020 3.534 x 108 km 3.63 years H. Olbers, 1807
5. Astraea . . 3.89 x 108 km (2.58 AU) 4.13 years Hencke, 1845
10. Hygiea 430 km . 4.703 x 108 km xx years De Gasparis, 1849
15. Eunomia 272 km . 3.955 x 108 km xx years De Gasparis, 1851
433. Eros (NEA) 34.7 x 17.4 x 14 km 7 x 1015 kg 2.25 x 108 km
(1.5 AU)
1.76 years Gustav Witt and Auguste H.P. Charlois, 1893
951. Gaspra 34 x 20 km 10 x 1015 kg 2.05 x 108 km 3.29 years Grigoriy N. Neujamin, 1916
1221. Amor (NEA) . . 1.45 x 108 km (0.97 AU) 2.66 years E. Delporte, 1932
1862. Apollo (NEA) 1.6 km 2 x 1012 kg 2.20 x 108 km (1.47 AU) 1.81 years K. Reinmuth,1932
2062. Aten (NEA) . . 2.20 x 108 km (1.92 AU) 0.95 years Helin, 1976
*The asteroids' numbers are assigned according to the order in which they were discovered.



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