Английская Википедия:490 Veritas
Шаблон:Short description Шаблон:Use dmy dates Шаблон:Infobox planet
Veritas, minor planet designation 490 Veritas, is a carbonaceous Veritasian asteroid, which may have been involved in one of the more massive asteroid-asteroid collisions of the past 100 million years. It was discovered by German astronomer Max Wolf at Heidelberg Observatory on 3 September 1902.
Description
With an diameter of more than 100 kilometers, Veritas is the largest member and namesake of the Veritas family, a mid-sized asteroid family of carbonaceous asteroids in the outer main-belt, that formed recently approximately Шаблон:Val million years ago.[1][2]Шаблон:Rp 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. Veritas and Undina would have been the largest fragments of that collision which caused a "late Miocene dust shower". The family consists of more than a thousand known members including 1086 Nata, 2428 Kamenyar and 2934 Aristophanes.
Late Miocene dust shower
Substantiating Nesvorný's estimate, Kenneth Farley et al. found evidence in sea-floor sediments of a fourfold 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.[3]
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.
Study
490 Veritas has been observed to occult 13 stars between 2006 and 2023.
References
External links
- The Asteroid Veritas: An intruder in a family named after it?
- Lightcurve plot of (490) Veritas Шаблон:Webarchive, Antelope Hills Observatory
- "Asteroid Smashup Yields Dust Shower on Earth" from SkyandTelescope.com, Jan. 20, 2006.
- Шаблон:AstDys
- Шаблон:JPL small body
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