海王星環

海王星環係海王星主要嘅5個環。

歷史

呢啲環最初係由喺智利嘅觀星人員喺1984年7月22號發現^[1]。到1989年，航行者2號成功第一次同佢影咗相^[2]。

名

海王星嘅5個環嘅名都係嚟自有份貢獻嘅天文學家嘅名^[2]： Johann Gottfried Galle（Galle）、Urbain Le Verrier（Le Verrier）、William Lassell（Lassell）、François Arago（Arago）、同埋 John Couch Adams（Adams）^[3]^[4]。

海王星有四個衛星喺個環附近走：Galatea、Naiad、Thalassa、同埋 Despina^[4]。

特徵

相對於其他太陽系行星嘅行星環，海王星嘅比較散同埋暗。就算係密度最高嘅部分，都只能夠同土星環密度低嘅部分有得揮。呢個係因為海王星嘅環主要係由有機化合物經過輻射而組成，同天王星環好相似^[5]。

個環嘅宇宙塵比例係介乎2成同7成之間，相對好高^[5]，但係佢哋嘅光深度（英文：Optical depth）就比較淺，唔夠0.1^[6]。仲有，海王星嘅環非常之穩定，自從1980年代第一次探測，到依家幾十年時間，基本上都冇郁過^[5]。雖然天文學家唔肯定係點解，不過一般估係同海王星同埋附近嘅 Galatea 嘅軌道共振有關^[7]。

攷

↑ Hubbard, W.B.; Brahic, A.; Sicardy, B.; Elicer, L.-R.; Roques, F.; Vilas, F. (1986). "Occultation detection of a neptunian ring-like arc". Nature. 319 (6055): 636. Bibcode:1986Natur.319..636H. doi:10.1038/319636a0. S2CID 4239213.
↑ ^2.0 ^2.1 Miner, Ellis D.; Wessen, Randii R.; Cuzzi, Jeffrey N. (2007). "The discovery of the Neptune ring system". Planetary Ring Systems. Springer Praxis Books. ISBN 978-0-387-34177-4.
↑ Listed in increasing distance from the planet
↑ ^4.0 ^4.1 Miner, Ellis D.; Wessen, Randii R.; Cuzzi, Jeffrey N. (2007). "Present knowledge of the Neptune ring system". Planetary Ring System. Springer Praxis Books. ISBN 978-0-387-34177-4.
↑ ^5.0 ^5.1 ^5.2 Smith, B. A.; Soderblom, L. A.; Banfield, D.; Barnet, C.; Basilevsky, A. T.; Beebe, R. F.; Bollinger, K.; Boyce, J. M.; Brahic, A. (1989). "Voyager 2 at Neptune: Imaging Science Results". Science. 246 (4936): 1422–1449. Bibcode:1989Sci...246.1422S. doi:10.1126/science.246.4936.1422. PMID 17755997. S2CID 45403579.
↑ Horn, Linda J.; Hui, John; Lane, Arthur L. (1990). "Observations of Neptunian rings by Voyager photopolarimeter experiment". Geophysical Research Letters. 17 (10): 1745–1748. Bibcode:1990GeoRL..17.1745H. doi:10.1029/GL017i010p01745.
↑ Burns, J.A.; Hamilton, D.P.; Showalter, M.R. (2001). "Dusty Rings and Circumplanetary Dust: Observations and Simple Physics" (PDF). 出自 Grun, E.; Gustafson, B. A. S.; Dermott, S. T.; Fechtig H. (編). Interplanetary Dust. Berlin: Springer. pp. 641–725. Bibcode:2001indu.book..641B. ISBN 3-540-42067-3.

[Hubbard1986-1] Hubbard, W.B.; Brahic, A.; Sicardy, B.; Elicer, L.-R.; Roques, F.; Vilas, F. (1986). "Occultation detection of a neptunian ring-like arc". Nature. 319 (6055): 636. Bibcode:1986Natur.319..636H. doi:10.1038/319636a0. S2CID 4239213.

[Miner2007-2] 2.0 ^2.1 Miner, Ellis D.; Wessen, Randii R.; Cuzzi, Jeffrey N. (2007). "The discovery of the Neptune ring system". Planetary Ring Systems. Springer Praxis Books. ISBN 978-0-387-34177-4.

[3] Listed in increasing distance from the planet

[Miner2007b-4] 4.0 ^4.1 Miner, Ellis D.; Wessen, Randii R.; Cuzzi, Jeffrey N. (2007). "Present knowledge of the Neptune ring system". Planetary Ring System. Springer Praxis Books. ISBN 978-0-387-34177-4.

[SmithSoderblom1989-5] 5.0 ^5.1 ^5.2 Smith, B. A.; Soderblom, L. A.; Banfield, D.; Barnet, C.; Basilevsky, A. T.; Beebe, R. F.; Bollinger, K.; Boyce, J. M.; Brahic, A. (1989). "Voyager 2 at Neptune: Imaging Science Results". Science. 246 (4936): 1422–1449. Bibcode:1989Sci...246.1422S. doi:10.1126/science.246.4936.1422. PMID 17755997. S2CID 45403579.

[Horn1990-6] Horn, Linda J.; Hui, John; Lane, Arthur L. (1990). "Observations of Neptunian rings by Voyager photopolarimeter experiment". Geophysical Research Letters. 17 (10): 1745–1748. Bibcode:1990GeoRL..17.1745H. doi:10.1029/GL017i010p01745.

[Burns2001-7] Burns, J.A.; Hamilton, D.P.; Showalter, M.R. (2001). "Dusty Rings and Circumplanetary Dust: Observations and Simple Physics" (PDF). 出自 Grun, E.; Gustafson, B. A. S.; Dermott, S. T.; Fechtig H. (編). Interplanetary Dust. Berlin: Springer. pp. 641–725. Bibcode:2001indu.book..641B. ISBN 3-540-42067-3.

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