Enkelad (mjesec)
Enkelad Enceladus snimljen orbiterom
Cassini , oktobar 2015.
[ a] Discovered by William Herschel Designation
Saturn II Imenovan po
Ἐγκέλαδος Egkelados Adjectives Enceladean [ 1] [ 2] 7005237948000000000♠ 237.948 km[ 3] 7006137021800000000♠ 1,370218 d[ 3] Inclination 0.009° (to Saturn's equator)[ 3] Mean radius
7003252100000000000♠ 252,1± 0,2 km[ 4] [ 5] 7002395000000000000♠ 0,03957003145100000000000♠ 0,14511.134 m/s2 (7002116000000000000♠ 0,0116g ) 7003330500000000000♠ 0,3305± 0,0025[ 6] 2.391 km/s (860.4 km/h)[ 3] Sinhrona 0 Albedo 7003137500000000000♠ 1,375± 0,008geometrijski na 550 nm)[ 7] 7001810000000000000♠ 0,81± 0,04Bond )[ 8] 11.7[ 10] Trace, significant spatial variability[ 11] [ 12] Composition by volume 91% vode parenitrogen ugljen-dioksid metan [ 13]
Enkelad (Enceladus ) je prirodni Saturnov satelit kojeg je 1789. otkrio astronom William Herschel . Ime je dobio po gigantu Enkeladu iz starogrčke mitologije . Ovaj satelit ima drugo ime Saturn II .
Karakteristike
Enkelad obilazi Saturn svakih 32 h 53 m 7 s, ima prosječni prečnik od 498,9 km i masu od 8,6×1019 kg . Prosječna gustoća Enkelada iznosi 1,3 g/cm3 . Mjerenja obavljena od strane svemirske letjelice Cassini-Huygens ookazala su da je ovaj satelit napravljen većinom od leda , vode i možda male količine kamena i metala .
Početkom 2006. NASA -ina letjelica Cassini snimila je erupcije gejzira na površini, vjerovatno sastavljene i od tekuće vode .
Reference
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^ a b c d e f Greška kod citiranja: Nevaljana oznaka <ref>;
nije naveden tekst za reference s imenom Facts ^ a b Greška kod citiranja: Nevaljana oznaka <ref>;
nije naveden tekst za reference s imenom Roatsch et al. 2009 ^ a b c Jacobson, Robert. A. (1. 11. 2022). "The Orbits of the Main Saturnian Satellites, the Saturnian System Gravity Field, and the Orientation of Saturn's Pole" . The Astronomical Journal . 164 (5): 199. Bibcode :2022AJ....164..199J . doi :10.3847/1538-3881/ac90c9 S2CID 252992162 . ^ McKinnon, W. B. (2015). "Effect of Enceladus's rapid synchronous spin on interpretation of Cassini gravity" . Geophysical Research Letters . 42 (7): 2137–2143. Bibcode :2015GeoRL..42.2137M . doi :10.1002/2015GL063384 ^ Greška kod citiranja: Nevaljana oznaka <ref>;
nije naveden tekst za reference s imenom Verbiscer et al. 2007 ^ Greška kod citiranja: Nevaljana oznaka <ref>;
nije naveden tekst za reference s imenom Howett_2010 ^ Spencer, John R.; Pearl, J. C.; et al. (2006). "Cassini Encounters Enceladus: Background and the Discovery of a South Polar Hot Spot". Science . 311 (5766): 1401–5. Bibcode :2006Sci...311.1401S . doi :10.1126/science.1121661 . PMID 16527965 . S2CID 44788825 . ^ Greška kod citiranja: Nevaljana oznaka <ref>;
nije naveden tekst za reference s imenom Observatorio ARVAL ^ Dougherty, M. K.; Khurana, K. K.; et al. (2006). "Identification of a Dynamic Atmosphere at Enceladus with the Cassini Magnetometer". Science . 311 (5766): 1406–9. Bibcode :2006Sci...311.1406D . doi :10.1126/science.1120985 . PMID 16527966 . S2CID 42050327 . ^ Hansen, Candice J.; Esposito, L.; et al. (2006). "Enceladus' Water Vapor Plume". Science . 311 (5766): 1422–5. Bibcode :2006Sci...311.1422H . doi :10.1126/science.1121254 . PMID 16527971 . S2CID 2954801 . ^ Waite, Jack Hunter Jr.; Combi, M. R.; et al. (2006). "Cassini Ion and Neutral Mass Spectrometer: Enceladus Plume Composition and Structure". Science . 311 (5766): 1419–22. Bibcode :2006Sci...311.1419W . doi :10.1126/science.1121290 . PMID 16527970 . S2CID 3032849 . ^ "Enceladus" . Lexico UK English DictionaryOxford University Press . Arhivirano s originala , 31. 7. 2020."Enceladus" . Merriam-Webster Dictionary ^ Greška kod citiranja: Nevaljana oznaka <ref>;
nije naveden tekst za reference s imenom Discovery ^ Greška kod citiranja: Nevaljana oznaka <ref>;
nije naveden tekst za reference s imenom Porco Helfenstein et al. 2006
Brown, Robert H. (2006). "Composition and Physical Properties of Enceladus' Surface" . Science . 311 (5766): 1425–1428. Castillo, Julie C. (2005). "26Al in the Saturnian System - New Interior Models for the Saturnian satellites" . Eos Trans. AGU . 82 (52): Fall Meet. Suppl. Abstract P32A-01. Arhivirano s originala , 30. 9. 2007. Pristupljeno 3. 7. 2013 . Castillo, J. C. (2006). "A New Understanding of the Internal Evolution of Saturnian Icy Satellites from Cassini Observations" (PDF) . LPSC . XXXVII . Abstract 2200. Dougherty, M. K. (2006). "Identification of a Dynamic Atmosphere at Enceladus with the Cassini Magnetometer" . Science . 311 (5766): 1406–1409. Hansen, Candice J. (2006). "Enceladus' Water Vapor Plume" . Science . 311 (5766): 1422–1425. Matson, D.L. (2006). "Enceladus' Interior and Geysers - Possibility for Hydrothermal Geometry and N2 Production" (PDF) . LPSC . XXXVII . Abstract 2219. Pappalardo, R.T. (2006). "Diapir-Induced Reorientation of Enceladus" (PDF) . LPSC . XXXVII . Abstract 2113. Porco, C.C. (2006). "Cassini Observes the Active South Pole of Enceladus" . Science . 311 (5766): 1393–1401. Rathbun, Julie A. (2005). "Enceladus' global geology as seen by Cassini ISS" . Eos Trans. AGU . 82 (52): Fall Meet. Suppl. Abstract P32A-03. Arhivirano s originala , 4. 4. 2008. Pristupljeno 3. 7. 2013 . Rothery, David A. (1999). Satellites of the Outer Planets: Worlds in their own right ISBN 0-19-512555-X . Spahn, Frank (2006). "Cassini Dust Measurements at Enceladus and Implications for the Origin of the E Ring" . Science . 311 (5766): 1416–1418. Spencer, J. R. (2006). "Cassini Encounters Enceladus: Background and the Discovery of a South Polar Hot Spot" . Science . 311 (5766): 1401–1405. Turtle, Elizabeth et al. Enceladus, Curiouser and Curiouser: Observations by Cassini's Imaging Science Subsystem . Cassini CHARM Telecon. 28 April 2005. (Adobe Acrobat file).
Verbiscer, Anne (2005). "The opposition surge of Enceladus: HST observations 338-1022 nm" . Icarus . 173 : 66–83. doi :10.1016/j.icarus.2004.05.001 . Waite Jr., J. Hunter (2006). "Cassini Ion and Neutral Mass Spectrometer: Enceladus Plume Composition and Structure" . Science . 311 (5766): 1419–1422.
Vanjski linkovi
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