Ganumedes (maan): Verskil tussen weergawes
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| image = [[Lêer:Ganymede g1 true 2.jpg|250px|Ganymedes]] |
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| caption = Ganymedes, soos waargeneem deur die Galileo-wenteltuig |
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Wysiging soos op 14:35, 23 Maart 2012
 Ganymedes, soos waargeneem deur die Galileo-wenteltuig | |||||||
| Ontdekking | |||||||
|---|---|---|---|---|---|---|---|
| Ontdek deur | Galileo Galilei | ||||||
| Datum | 7 Januarie 1610[1][2][3] | ||||||
| Alternatiewe name | Jupiter III | ||||||
| Wentelbaaneienskappe | |||||||
| Periapside | 1,069,200 km[b] | ||||||
| Apoapside | 1,071,600 km[a] | ||||||
| Halwe lengteas | 1,070,400 km[4] | ||||||
| Wentelperiode | 7.15455296 dae[4] | ||||||
| Gem. omwentelingspoed | 10.880 km/s | ||||||
| Baanhelling | 0.20° tot Jupiter se ewenaar[4] | ||||||
| Satelliet van | Jupiter | ||||||
Fisiese eienskappe |
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| Gem. radius | 2634.1 ± 0.3 km (0.413 Aardes)[5] | ||||||
| Oppervlakte | 87.0 miljoen km2 (0.171 Aardes)[c] | ||||||
| Volume | 7.610 km3 (0.0704 Aardes)[d] | ||||||
| Massa | 1.481923 kg (0.025 Aardes)[5] | ||||||
| Gem. digtheid | 1.936 g/cm3[5] | ||||||
| Oppervlak- aantrekkingskrag | 1.428 m/s2 (0.146 g)[e] | ||||||
| Ontsnapping- snelheid | 2.741 km/s[f] | ||||||
| Rotasieperiode | synchronies | ||||||
| Ashelling | 0–0.33°[6] | ||||||
| 0.43 ± 0.02[7] | |||||||
| Oppervlak-temp. K |
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| Skynmagnitude | 4.61 (opposisie)[7] 4.38 (in 1951)[10] | ||||||
| Atmosfeer | |||||||
| Oppervlakdruk | tekens | ||||||
| Samestelling | Suurstof (100 %)[11] | ||||||
Ganymedes (gan'-ə-meed-əs; Grieks Γανυμήδης, ook Jupiter III) is die grootste maan van die planeet Jupiter, en ook die grootste maan in die sonnestelsel. Ganymedes is groter as die planeet Mercurius, maar sy massa is net 50% van dié van Mercurius. Ganymedes is die enigste maan wat sonder 'n teleskoop sigbaar is, maar net in baie goeie en donker situasies.
Dis moontlik dat Ganymedes in 364 v.C. ontdek is deur die Sjinese sterrekundige Gan De. Galileo Galilei kry egter gewoonlik die eer daarvoor; die sterrekundige het die maan se bestaan in 1610 geregistreer. Ganymedes is die enigste maan van Jupiter wat 'n manlike naam het.
Verwysings
- ↑ Galilei, Galileo (1610). "Sidereus Nuncius" (PDF). University of Oklahoma History of Science. Besoek op 13 Januarie 2010.
{{cite web}}: Onbekende parameter|coauthors=geïgnoreer (hulp); Onbekende parameter|month=geïgnoreer (hulp) - ↑ Wright, Ernie. "Galileo's First Observations of Jupiter" (PDF). University of Oklahoma History of Science. Besoek op 13 Januarie 2010.
- ↑ "NASA: Ganymede". Solarsystem.nasa.gov. 29 September 2009. Besoek op 8 Maart 2010.
- ↑ 4,0 4,1 4,2 "Planetary Satellite Mean Orbital Parameters". Jet Propulsion Laboratory, California Institute of Technology.
- ↑ 5,0 5,1 5,2 Showman, Adam P. (1999). "The Galilean Satellites" (PDF). Science. 286 (5437): 77–84. doi:10.1126/science.286.5437.77. PMID 10506564.
{{cite journal}}: Onbekende parameter|coauthors=geïgnoreer (hulp) - ↑ Bills, Bruce G. (2005). "Free and forced obliquities of the Galilean satellites of Jupiter". Icarus. 175 (1): 233–247. Bibcode:2005Icar..175..233B. doi:10.1016/j.icarus.2004.10.028.
- ↑ 7,0 7,1 Yeomans, Donald K. (13 Julie 2006). "Planetary Satellite Physical Parameters". JPL Solar System Dynamics. Besoek op 5 November 2007.
- ↑ 8,0 8,1 Delitsky, Mona L. (1998). "Ice chemistry of Galilean satellites" (PDF). J.of Geophys. Res. 103 (E13): 31, 391–31, 403. Bibcode:1998JGR...10331391D. doi:10.1029/1998JE900020.
{{cite journal}}: Onbekende parameter|coauthors=geïgnoreer (hulp) - ↑ Orton, G.S.; Spencer, G.R.; et al. (1996). "Galileo Photopolarimeter-radiometer observations of Jupiter and the Galilean Satellites". Science. 274 (5286): 389–391. Bibcode:1996Sci...274..389O. doi:10.1126/science.274.5286.389.
- ↑ Yeomans and Chamberlin. "Horizon Online Ephemeris System for Ganymede (Major Body 503)". California Institute of Technology, Jet Propulsion Laboratory. Besoek op 14 April 2010. (4.38 on 1951-Oct-03)
- ↑ Hall, D.T.; Feldman, P.D.; et al. (1998). "The Far-Ultraviolet Oxygen Airglow of Europa and Ganymede". The Astrophysical Journal. 499 (1): 475–481. Bibcode:1998ApJ...499..475H. doi:10.1086/305604.
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