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.