Menoetius (moon)
Menoetius is the only moon of the asteroid Trojan 617 Patroclus.
 Plot of the results of the multi-chord stellar occultation by 617 Patroclus and Menoetius | |
| Discovery | |
|---|---|
| Discovery date | 2001 |
| Designations | |
| Pronunciation | /mɪˈniːʃəs/ mi-NEE-shəs |
Named after | Menoetius (Greek mythology) |
| Adjectives | Menoetian /mɪˈniːʃən/[1]) |
| Orbital characteristics | |
| 680±20 km 664.6 km | |
| 102.8 h | |
| Satellite of | Patroclus |
| Physical characteristics | |
| Dimensions | 117 km × 108 km × 90 km |
Mean diameter | 104±3 km |
In 2001, scientists found that Patroclus is a binary system, made up of two asteroids of about the same size.[2][3] It is one of 18 binary Trojan asteroids known to exist. In 2006, good measurements of the orbit from the Keck Laser guide star adaptive optics system were reported.
It was estimated[4] that the two components orbit around their center of mass in 4.283±0.004 days at a distance of 680±20 km in a roughly circular orbit. Combining these observations with thermal measurements taken in 2000, the sizes of the components of the system were estimated at 106 km and 98 km, with an equivalent whole-system diameter of 145 km, refined by later measurements from the Keck Observatory to approximately 122 km and 112 km for each partner,[5] and a co-orbital period of 103.5±0.3 hours (
Menoetius (moon) Media
Hubble images of Patroclus and Menoetius orbiting each other, from May to June 2017
Artist's conception of Patroclus and Menoetius orbiting around their center of mass, occasionally eclipsing one another
Artist's impression of the Patroclus-Menoetius binary system
Animation of Lucy's trajectory around Sun Lucy · Sun · Earth · 52246 Donaldjohanson · 3548 Eurybates · 21900 Orus · 617 Patroclus
Artist's impression of the Lucy spacecraft flying past the Patroclus-Menoetius system
4.3125±0.0125 days).
On 21 October 2013, both bodies occulted a magnitude 8.8 star as observed by a team of 41 observers stationed across the USA. Observation data put the orbital distance of 664.6 km, and give a size for the slightly larger component, which retains the name Patroclus with overall volume equivalent to a 113 km sphere, with the smaller component now named Menoetius with a volume equivalent to a 104 km diameter sphere.
References
- ↑ Redfield (1994) Nature and culture in the Iliad: the tragedy of Hector
- ↑ Merline, W. J. (2001), IAUC 7741: 2001fc; S/2001 (617) 1; C/2001 T1, C/2001 T2
- ↑ "Satellites and Companions of Minor Planets". IAU / CBAT. 2009-09-17. Archived from the original on 2011-01-21. Retrieved 2011-01-25.
- ↑ Sanders, Robert (2006), Binary asteroid in Jupiter's orbit may be icy comet from solar system's infancy, University of California, Berkeley
- ↑ Sanders, Robert. "Trojan Binary Asteroid – Patroclus & Menoetius". UC Berkeley. Retrieved 2017-10-04.