| 词条 | Halimede (moon) |
| 释义 |
| image = | caption = Halimede's discovery image | ref_discovery = [2] | name = Halimede | discoverer = {{unbulleted list | M. Holman | J. J. Kavelaars | T. Grav, W. Fraser | D. Milisavljevic }} | discovery_date = August 14, 2002 | ref_orb_elems = [3] | epoch = June 10, 2003 | semimajor = 16.611 | eccentricity = 0.2646 | inclination = 134.1 | period = 1879.08 d (5.14 a) | diameter = 62 km[4] | albedo = 0.04 {{small|(assumed)}}[4] | color = neutral (grey) {{small|1=B-V=0.73 R-V=0.35}}[6] }}Halimede ({{IPAc-en|ˈ|h|æ|l|ᵻ|ˈ|m|iː|d|iː}} {{respell|HAL|i|MEE|dee}}; Greek: Αλιμήδη), 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.[7] Halimede has the second most eccentric and third most inclined orbit around Neptune.[8] 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. Halimede is about 62 kilometers in diameter (assuming an albedo of 0.04)[4] 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%[7]) of collision in the past lifespan of the Solar System, it has been suggested that the satellite could be a fragment of Nereid.[6] 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. In popular culture
References1. ^1 {{cite journal| last = Green| first = Daniel W. E.| title = Satellites of Neptune| date = January 13, 2003| journal = IAU Circular| volume = 8047| url = http://www.cbat.eps.harvard.edu/iauc/08000/08047.html| accessdate = 2011-10-24}} [1][2][3][4][5][6]2. ^1 {{cite web| last = Jacobson| first = R. A.| year = 2008| title = NEP078 – JPL satellite ephemeris| work = Planetary Satellite Mean Orbital Parameters| url = http://ssd.jpl.nasa.gov/?sat_elem| accessdate = 2009-09-23}} 3. ^1 2 3 {{cite journal| doi = 10.1086/504799| last1 = Sheppard| first1 = Scott S.| authorlink1 = Scott S. Sheppard| last2 = Jewitt| first2 = David C.| authorlink2 = David C. Jewitt| last3 = Kleyna| first3 = Jan| authorlink3 = Jan Kleyna| year = 2006| title = A Survey for "Normal" Irregular Satellites around Neptune: Limits to Completeness| journal = The Astronomical Journal| volume = 132| pages = 171–176| pmid = | pmc = | bibcode = 2006AJ....132..171S| arxiv = astro-ph/0604552| ref = harv}} 4. ^1 2 {{cite journal| doi = 10.1086/424997| last1 = Grav| first1 = Tommy| last2 = Holman| first2 = Matthew J.| authorlink2 = Matthew J. Holman| last3 = Fraser| first3 = Wesley C.| date = 2004-09-20| title = Photometry of Irregular Satellites of Uranus and Neptune| journal = The Astrophysical Journal| volume = 613| issue = 1| pages = L77–L80| pmid = | pmc = | arxiv = astro-ph/0405605| bibcode = 2004ApJ...613L..77G| ref = harv}} 5. ^1 2 {{cite journal| doi = 10.1038/nature02832| last1 = Holman| first1 = M. J.| authorlink = Matthew J. Holman| last2 = Kavelaars| first2 = J. J.| authorlink2 = John J. Kavelaars| last3 = Grav| first3 = T.| display-authors = 3| year = 2004| last4 = Gladman| first4 = B. J.| authorlink4 = Brett J. Gladman| last5 = Fraser| first5 = W. C.| last6 = Milisavljevic| first6 = D.| last7 = Nicholson| first7 = P. D.| last8 = Burns| first8 = J. A.| last9 = Carruba| first9 = V.| title = Discovery of five irregular moons of Neptune| journal = Nature| volume = 430| issue = 7002| pages = 865–867| pmid = 15318214| pmc = | bibcode = 2004Natur.430..865H| url = https://www.cfa.harvard.edu/~mholman/nature_final.pdf| format = PDF| accessdate = 24 October 2011| ref = harv}} 6. ^1 {{cite web| last = Williams| first = Dr. David R.| date = 2008-01-22| title = Neptunian Satellite Fact Sheet| publisher = NASA (National Space Science Data Center)| url = http://nssdc.gsfc.nasa.gov/planetary/factsheet/neptuniansatfact.html| accessdate = 2011-11-03}} }} External links{{Commons category|Halimede (moon)}}
4 : Moons of Neptune|Irregular satellites|Discoveries by Matthew J. Holman|Astronomical objects discovered in 2002 |
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