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

MPC designation

| (3554) Amun
Named after| Amun

Alternative designations

| 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)

Semi-major axis

| 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°

|{{{apsis}}}|helion}}

| 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]

Spectral type

| 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. ↑ 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.
2. ↑ Schmadel, Lutz (2003). Dictionary of minor planet names. 1. Springer. p. 299. ISBN 9783540002383. https://books.google.com/books?id=VoJ5nUyIzCsC&pg=PA299.
3. ↑ 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.
4. ↑ 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.
5. ↑ 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.
6. ↑ "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
* Ephemerides * Observations * Orbit * Physical Properties * Summary
* 3554 Amun at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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