Laomedeia

Laomedeia /ˌleɪəməˈdiːə/, also known as Neptune XII, is a prograde irregular satellite of Neptune. It was discovered by Matthew J. Holman, et al. on August 13, 2002.^[6] Before the announcement of its name on February 3, 2007 (IAUC 8802), it was known as S/2002 N 3.

Laomedeia

Laomedeia imaged by the Very Large Telescope's FORS1 imager in September 2002
Discovery[1][2]
Discovered by	M.Holman JJ Kavelaars T. Grav W. Fraser D. Milisavljevic
Discovery date	August 13, 2002
Designations
Designation	Neptune XII
Pronunciation	/ˌleɪəməˈdiːə/
Named after	Λαομέδεια Lāomedeia
Alternative names	S/2002 N 3
Adjectives	Laomedeian[3]
Orbital characteristics[4]
Epoch 2003 Jun. 10.00 TT
Semi-major axis	23,613,000 km
Eccentricity	0.3969
Orbital period (sidereal)	3171.33 days (8.68 yr)
Inclination	37.874°
Satellite of	Neptune
Group	Sao group
Physical characteristics
Mean diameter	42 km (for albedo 0.04)[5]
Albedo	0.04 (assumed)[5]

It orbits Neptune at a distance of about 23,571,000 km and is about 42 kilometers in diameter (assuming albedo of 0.04).^[5] It is named after Laomedeia, one of the 50 Nereids.

References

1. JPL (2011-07-21). "Planetary Satellite Discovery Circumstances". Jet Propulsion Laboratory. Retrieved 2011-10-24.
2. Green, Daniel W. E. (January 13, 2003). "Satellites of Neptune". IAU Circular. 8047. Retrieved 2011-10-24.
3. "Laomedian" in Otley (1828) Essays on the nature, causes and effects of national antipathies
4. Jacobson, R. A. (2008). "NEP078 – JPL satellite ephemeris". Planetary Satellite Mean Orbital Parameters. Retrieved 2009-09-23.
5. Sheppard, Scott S.; Jewitt, David C.; Kleyna, Jan (2006). "A Survey for "Normal" Irregular Satellites around Neptune: Limits to Completeness". The Astronomical Journal. 132 (1): 171–176. arXiv:astro-ph/0604552. Bibcode:2006AJ....132..171S. doi:10.1086/504799. S2CID 154011.
6. Holman, M. J.; Kavelaars, J. J.; Grav, T.; et al. (2004). "Discovery of five irregular moons of Neptune" (PDF). Nature. 430 (7002): 865–867. Bibcode:2004Natur.430..865H. doi:10.1038/nature02832. PMID 15318214. S2CID 4412380. Retrieved 24 October 2011.

External links

• Neptune's Known Satellites, by Scott S. Sheppard
• David Jewitt pages
• MPC: Natural Satellites Ephemeris Service
• Mean orbital parameters, NASA