| 词条 | Sao (moon) |
| 释义 |
| ref_discovery = [2] | name = Sao | discoverer = {{unbulleted list | M.Holman | JJ Kavelaars | T. Grav | W. Fraser | D. Milisavljevic }} | discovery_date = August 14, 2002 | ref_orb_elems = [3] | epoch = June 10, 2003 | semimajor = 22.228 | eccentricity = 0.1365 | inclination = 53.483 | period = 2912.72 days (7.97 yr) | diameter = 44 km[4] | albedo = 0.04 assumed[4] }}Sao ({{IPAc-en|ˈ|s|eɪ|.|oʊ}} {{respell|SAY|oh}}; Greek: Σαώ) is a prograde irregular satellite of Neptune. It was discovered by Matthew J. Holman et al. on August 14, 2002.[6] Sao orbits Neptune at a distance of about 22.4 million km and is about 44 kilometers in diameter (assuming an albedo of 0.04).[4] Sao follows an exceptionally inclined and moderately eccentric orbit 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. The satellite is in Kozai resonance, i.e. its inclination and eccentricity are coupled (the inclination of the orbit decreases while eccentricity increases and vice versa).[6] Sao, or Neptune XI, like many of the outer satellites of Neptune, is named after one of the Nereids; Sao was associated with sailing and is referred to as "The rescuer" or "Safety". Before the announcement of its name on February 3, 2007 (IAUC 8802), Sao was known provisionally as S/2002 N 2. 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]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 = 10.1038/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}} }}
External links
4 : Moons of Neptune|Irregular satellites|Discoveries by Matthew J. Holman|Astronomical objects discovered in 2002 |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。