490 Veritas: Difference between revisions
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At 115 and 125 km in diameter, Veritas and [[92 Undina]] are the biggest of the 300-strong Veritas [[Asteroid family|family]] of asteroids. David Nesvorný of the Southwest Research Institute in [[Boulder, Colorado|Boulder]] traced the orbits of these bodies back in time, and calculated that they formed in a collision of a body at least 150 km in diameter with a smaller asteroid some 8 million years ago. Veritas and Undina would have been the biggest pieces of that collision. |
At 115 and 125 km in diameter, Veritas and [[92 Undina]] are the biggest of the 300-strong Veritas [[Asteroid family|family]] of asteroids. David Nesvorný of the Southwest Research Institute in [[Boulder, Colorado|Boulder]] traced the orbits of these bodies back in time, and calculated that they formed in a collision of a body at least 150 km in diameter with a smaller asteroid some 8 million years ago. Veritas and Undina would have been the biggest pieces of that collision. |
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Substantiating Nesvorný's estimate, [[Kenneth Farley]] ''et al.'' found evidence in sea-floor sediments of a four-fold increase in the amount of [[cosmic dust]] reaching Earth's surface, which began 8.2 million years ago and tapered off over the next million and a half years. This is one of the largest increases in dust deposits of the past 100 million years. |
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The suspected Veritas collision would have been too far from [[Jupiter]] for the fragments to have been slung into a collision course with Earth. However, solar radiation would have caused the resulting dust to drift inward to Earth orbit over a time span consistent with the record of dust in the ocean sediment. |
The suspected Veritas collision would have been too far from [[Jupiter]] for the fragments to have been slung into a collision course with Earth. However, solar radiation would have caused the resulting dust to drift inward to Earth orbit over a time span consistent with the record of dust in the ocean sediment. |
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Revision as of 03:20, 16 January 2008
490 Veritas
| Name | |
|---|---|
| Name | Veritas |
| Designation | 1902 JP |
| Discovery | |
| Discoverer | Max Wolf |
| Discovery date | September 3, 1902 |
| Discovery site | Heidelberg |
| Orbital elements | |
| Epoch August 18, 2005 (JDCT 2453600.5) | |
| Eccentricity (e) | 0.099 |
| Semimajor axis (a) | 3.170 AU |
| Perihelion (q) | 2.856 AU |
| Aphelion (Q) | 3.483 AU |
| Orbital period (P) | 5.643 a |
| Inclination (i) | 9.264° |
| Longitude of the ascending node (Ω) | 178.513° |
| Argument of Perihelion (ω) | 196.985° |
| Mean anomaly (M) | 50.159° |
490 Veritas is a big asteroid, which may have been involved in one of the more huge asteroid-asteroid collisions of the past 100 million years.
At 115 and 125 km in diameter, Veritas and 92 Undina are the biggest of the 300-strong Veritas family of asteroids. David Nesvorný of the Southwest Research Institute in Boulder traced the orbits of these bodies back in time, and calculated that they formed in a collision of a body at least 150 km in diameter with a smaller asteroid some 8 million years ago. Veritas and Undina would have been the biggest pieces of that collision.
The suspected Veritas collision would have been too far from Jupiter for the fragments to have been slung into a collision course with Earth. However, solar radiation would have caused the resulting dust to drift inward to Earth orbit over a time span consistent with the record of dust in the ocean sediment.
Today continuing collisions among Veritas-family asteroids are estimated to send five thousand tons of cosmic dust to Earth each year, 15% of the total.
References
- Kenneth A. Farley, David Vokrouhlický, William F. Bottke, David Nesvorný, "A late Miocene dust shower from the break-up of an asteroid in the main belt." Nature 439, 295-297 (19 January 2006) [1]
External links
- "Asteroid Smashup Yields Dust Shower on Earth" from SkyandTelescope.com, Jan. 20, 2006.