Astronomy:3554 Amun
 Orbit diagram of asteroid Amun with location as of September 9, 2012 | |
| Discovery | |
|---|---|
| Discovered by | C. Shoemaker E. M. Shoemaker |
| Discovery date | 4 March 1986 |
| Designations | |
| (3554) Amun | |
| Named after | Amun |
| 1986 EB | |
| Minor planet category | Aten [1] Venus-crosser asteroid |
| Orbital characteristics[1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 10923 days (29.91 yr) |
| |{{{apsis}}}|helion}} | 1.24677 astronomical unit|AU (186.514 Gm) |
| |{{{apsis}}}|helion}} | 0.700578 AU (104.8050 Gm) |
| 0.973675 AU (145.6597 Gm) | |
| Eccentricity | 0.28048 |
| Orbital period | 0.961 yr (350.9 d) |
| Mean anomaly | 184.781° |
| Mean motion | 1.02585°/day |
| Inclination | 23.3626° |
| Longitude of ascending node | 358.627° |
| 359.392° | |
| Earth MOID | 0.250204 AU (37.4300 Gm) |
| Physical characteristics | |
| Mean diameter | 3.341 km[1] |
| Mass | ~ 1.6×1013 kg |
| Rotation period | 2.53001 h (0.105417 d)[1] |
| Geometric albedo | 0.1284±0.024[1] |
| M-type asteroid | |
| Absolute magnitude (H) | 15.82[1] |
3554 Amun is an Aten asteroid, meaning it crosses Earth's orbit, and a Venus-crosser. It was discovered on 4 March 1986 by Carolyn and Eugene Shoemaker at Mount Palomar Observatory, and named for the ancient Egyptian deity Amun.[2] Amun was the fifth Aten asteroid to be numbered.
Photometric observations of 3554 Amun during 2017–2018 were combined to determine a rotation period of 2.53029±0.00002 hours.[3] It has been classified as an M-type asteroid in the Tholen taxonomy, X-type in the Bus taxonomy, and C-, X-, and D-type in the Bus-DeMeo taxonomy. The featureless optical spectrum has a similar slope to the Tagish Lake meteorite, although 3554 Amun is not considered the source.[4] The infrared spectrum of 3554 Amun was found to match a D-type asteroid taxonomy.[5] The estimated diameter is 3.341 kilometers,[1] making it one of the smallest known asteroids to have an M-type classification.[citation needed]
Amun was once considered metallic, based on an M-type optical spectrum. In Mining the Sky, planetary scientist John S. Lewis calculated the purported value of a metallic 3554 Amun at $20 trillion.[6] (6178) 1986 DA is another M-type near-Earth asteroid with lower inclination that is actually metallic.
Amun passes close to Venus, and in 1964, 2034, and 2103 comes within 10 Gm of it.[1]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "JPL Small-Body Database Browser: 3554 Amun (1986 EB)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Amun;cad=1.
- ↑ Schmadel, Lutz (2003). Dictionary of minor planet names. 1. Springer. p. 299. ISBN 9783540002383. https://books.google.com/books?id=VoJ5nUyIzCsC&pg=PA299.
- ↑ Koehn, Bruce W. et al. (October 2014). "Lowell Observatory Near-Earth Asteroid Photometric Survey (NEAPS) - 2009 January through 2009 June". Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 41 (4): 286–300. Bibcode: 2014MPBu...41..286K.
- ↑ Izawa, M. R. M. et al. (July 2015). "Variability, absorption features, and parent body searches in "spectrally featureless" meteorite reflectance spectra: Case study - Tagish Lake". Icarus 254: 324–332. doi:10.1016/j.icarus.2015.04.013. Bibcode: 2015Icar..254..324I.
- ↑ Thomas, Cristina A. et al. (January 2014). "Physical characterization of Warm Spitzer-observed near-Earth objects". Icarus 228: 217–246. doi:10.1016/j.icarus.2013.10.004. Bibcode: 2014Icar..228..217T.
- ↑ "NSS Review: Mining the Sky" (in en). http://www.nss.org/resources/books/non_fiction/NF_011_miningthesky.html.
External links
- Economic value of asteroid 3554 Amun
- 3554 Amun at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
- 3554 Amun at ESA–space situational awareness
- 3554 Amun at the JPL Small-Body Database
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