| Autor: |
E. F. Helin, E. M. Shoemaker |
| Rok vydání: |
1977 |
| Předmět: |
|
| Zdroj: |
International Astronomical Union Colloquium. 39:297-300 |
| ISSN: |
0252-9211 |
| DOI: |
10.1017/s0252921100070202 |
| Popis: |
From discoveries made in several independent surveys of the sky, the number of Apollo asteroids to absolute visual magnitude 18 is estimated to be of the order of 103; the ratio of Mars-crossing asteroids to Apcllos is estimated to lie between 10 and 60. The loss of Apollos to magnitude 18 over the last 3 billion years, by collision with the planets and ejection from the solar system, is estimated to have been several times 104 objects. Mars-crossing asteroids appear to be an inadequate source for all of these objects. Most Apollos probably are dead short-period comets. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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