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Laomedeia (pronounced /ˌleɪ.ɵmɨˈdiː.ə/ LAY-o-mə-DEE-ə, or /ˌleɪ.ɵmɨˈdaɪ.ə/ LAY-o-mə-DYE-ə, or as in Greek Λαομέδεια), 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.[4] Before the announcement of its name on February 3, 2007 (IAUC 8802), it was known as S/2002 N 3.

Irregular satellites of Neptune (*).

It orbits Neptune at a distance of about 23,571,000 km and is about 42 kilometers in diameter (assuming albedo of 0.04).[3] It is named after Laomedeia, one of the 50 Nereids.


1. ^ Planetary Satellite Discovery Circumstances (JPL-SSD)
2. ^ Jacobson, R.A. (2008) NEP078 - JPL satellite ephemeris
3. ^ a b c S. Sheppard, D. Jewitt and J. Kleyna A Survey for "Normal" Irregular Satellites Around Neptune: Limits to Completeness, The Astronomical Journal, 132 (2006), pp. 171–176. Preprint.
4. ^ M. Holman, JJ Kavelaars, B. Gladman, T. Grav, W. Fraser, D. Milisavljevic, P. Nicholson, J. Burns, V. Carruba, J.-M. Petit, P. Rousselot, O. Mousis, B. Marsden, R. Jacobson; Discovery of five irregular moons of Neptune, Nature, 430 (2004), pp. 865-867. Final preprint(pdf)

External links

* Neptune's Known Satellites (by Scott S. Sheppard)
* David Jewitt pages
* Ephemeris (IAU)[1]
* Mean orbital parameters (NASA)[2]

Moons of Neptune

see also: The Solar System

Astronomy Encyclopedia

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