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Title: Laomedeia  
Author: World Heritage Encyclopedia
Language: English
Subject: Irregular satellites
Publisher: World Heritage Encyclopedia


Discovery [1][2]
Discovered by
Discovered August 13, 2002
Mean orbital elements [3]
Epoch 2003 Jun. 10.00 TT
Semi-major axis 23.613 Gm
Eccentricity 0.3969
Inclination 37.874° *
Orbital period 3171.33 days
(8.68 yr)
Physical characteristics
Mean diameter 42 km[4] **
Rotation period ?
Albedo 0.04 assumed[4]
Color ?
Spectral type ?

*to the ecliptic

**based on the albedo

Laomedeia ( or ; Greek: Λαομήδεια), 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.[5] Before the announcement of its name on February 3, 2007 (IAUC 8802), it was known as S/2002 N 3.

It orbits Neptune at a distance of about 23,571,000 km and is about 42 kilometers in diameter (assuming albedo of 0.04).[4] It is named after Laomedeia, one of the 50 Nereids.


  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. ^ Jacobson, R. A. (2008). "NEP078 – JPL satellite ephemeris". Planetary Satellite Mean Orbital Parameters. Retrieved 2009-09-23. 
  4. ^ a b c  
  5. ^  

External links

  • Neptune's Known Satellites (by Scott S. Sheppard)
  • David Jewitt pages
  • MPC: Natural Satellites Ephemeris Service
  • Mean orbital parameters (NASA)[1]
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