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Halimede (moon)

Moon of Neptune

Field	Value
name	Halimede
image	N2002n1b.jpg
caption	Halimede imaged by the Very Large Telescope during follow-up observations on 3 September 2002
discovery_ref
discoverer
discovered	August 14, 2002
mpc_name	Neptune IX
alt_names	S/2002 N 1
pronounced
adjective	Halimedean
named_after	Ἁλιμήδη Halimēdē
orbit_ref
epoch	June 10, 2003
semimajor	16,611,000 km
eccentricity	0.2646
inclination	134.1°
period	1879.08 d
(retrograde)
mean_diameter	62 km (for albedo 0.04)
albedo	0.04 (assumed)
spectral_type	neutral (grey)

(retrograde)

Halimede , or Neptune IX, is a retrograde irregular satellite of Neptune. It was discovered by Matthew J. Holman, John J. Kavelaars, Tommy Grav, Wesley C. Fraser and Dan Milisavljevic on August 14, 2002.

Name

Halimede, like many of the outer satellites of Neptune, is named after one of the Nereids, the fifty daughters of Nereus and Doris. Before the announcement of its name on February 3, 2007 (IAUC 8802), Halimede was known by the provisional designation S/2002 N 1.

Orbit

Irregular satellites of Neptune.

Halimede has the second most eccentric and third most inclined orbit around Neptune. This is illustrated on the diagram in relation to other irregular satellites of Neptune. The satellites above the horizontal axis are prograde, the satellites beneath it are retrograde. The yellow segments extend from the pericentre to the apocentre, showing the eccentricity. It is also worth mentioning that Sao and Laomedeia are similar to Halimede but they both have prograde orbits unlike Halimede which has a retrograde orbit.

Physical characteristics

Halimede is about 62 kilometers in diameter (assuming an albedo of 0.04) and appears neutral (grey) in the visible light. Given the very similar colour of the satellite to that of Nereid together with the high probability (41%) of collision in the past lifespan of the Solar System, it has been suggested that the satellite could be a fragment of Nereid.

References

| access-date = 2011-10-24

| access-date = 2009-09-23

| access-date = 2011-11-03

References

Noah Webster (1884) ''A Practical Dictionary of the English Language''
"In Depth {{!}} Halimede".

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

moons-of-neptune irregular-satellites discoveries-by-matthew-j.-holman discoveries-by-tommy-grav astronomical-objects-discovered-in-2002 moons-with-a-retrograde-orbit

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