Astronomy:490 Veritas
| Discovery | |
|---|---|
| Discovered by | Max Wolf |
| Discovery site | Heidelberg Obs. |
| Discovery date | 3 September 1902 |
| Designations | |
| (490) Veritas | |
| Pronunciation | /ˈvɛrɪtæs/[2] |
| 1902 JP | |
| Minor planet category | main-belt · (outer) Veritas [1] |
| Adjectives | Veritasian[3] |
| Orbital characteristics[4] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 113.37 yr (41409 d) |
| |{{{apsis}}}|helion}} | 3.4715 astronomical unit|AU (519.33 Gm) |
| |{{{apsis}}}|helion}} | 2.8719 AU (429.63 Gm) |
| 3.1717 AU (474.48 Gm) | |
| Eccentricity | 0.094527 |
| Orbital period | 5.65 yr (2063.2 d) |
| Mean anomaly | 31.094° |
| Mean motion | 0° 10m 28.164s / day |
| Inclination | 9.2809° |
| Longitude of ascending node | 178.335° |
| 194.390° | |
| Earth MOID | 1.87147 AU (279.968 Gm) |
| Jupiter MOID | 1.98443 AU (296.867 Gm) |
| TJupiter | 3.175 |
| Physical characteristics | |
| Dimensions | 110.96 ± 3.80 km[5] 115.55±5.5 km[4] |
| Mass | (5.99 ± 2.23) × 1018 kg[5] |
| Mean density | 8.37 ± 3.23 g/cm3[5] |
| Rotation period | 7.930 h (0.3304 d) |
| Geometric albedo | 0.0622±0.006 |
| Absolute magnitude (H) | 8.53,[6] 8.32[4] |
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 8.5±0.5 million years ago.[1][7]:8,23 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.[8]
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
- ↑ 1.0 1.1 "Asteroid 490 Veritas – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=490+Veritas.
- ↑ Noah Webster (1884) A Practical Dictionary of the English Language
- ↑ James Morrow (1990) City of Truth
- ↑ 4.0 4.1 4.2 Yeomans, Donald K., "490 Veritas", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=490, retrieved 9 May 2016.
- ↑ 5.0 5.1 5.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73 (1): 98–118, doi:10.1016/j.pss.2012.03.009, Bibcode: 2012P&SS...73...98C. See Table 1.
- ↑ Warner, Brian D. (December 2007), "Initial Results of a Dedicated H-G Project", The Minor Planet Bulletin 34 (4): 113–119, Bibcode: 2007MPBu...34..113W.
- ↑ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131. Bibcode: 2015aste.book..297N.
- ↑ Farley, Kenneth A.; Vokrouhlický, David; Bottke, William F.; Nesvorný, David (January 2006). "A late Miocene dust shower from the break-up of an asteroid in the main belt". Nature 439 (7074): 295–297. doi:10.1038/nature04391. PMID 16421563. Bibcode: 2006Natur.439..295F. http://astro.troja.mff.cuni.cz/davok/papers/veritas_he3.pdf. Retrieved 4 September 2017.
External links
- The Asteroid Veritas: An intruder in a family named after it?
- Lightcurve plot of (490) Veritas , Antelope Hills Observatory
- "Asteroid Smashup Yields Dust Shower on Earth" from SkyandTelescope.com, Jan. 20, 2006.
- 490 Veritas at AstDyS-2, Asteroids—Dynamic Site
- 490 Veritas at the JPL Small-Body Database
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