Astronomy:Helike (moon)
From HandWiki
 Images of Helike by the Canada-France-Hawaii Telescope in February 2003 | |
| Discovery | |
|---|---|
| Discovered by | Scott S. Sheppard et al. |
| Discovery date | 2003 |
| Designations | |
Designation | Jupiter XLV |
| Pronunciation | /ˈhɛləkiː/[1][2] |
| Named after | Ἑλίκη Helicē |
| S/2003 J 6 | |
| Adjectives | Helikean /hɛləˈkiːən/[3] |
| Orbital characteristics [4] | |
| 21263000 km | |
| Eccentricity | 0.156 |
| Orbital period | −634.8 days |
| Mean anomaly | 36.2° |
| Inclination | 154.8° |
| Longitude of ascending node | 100.3° |
| 314.7° | |
| Satellite of | Jupiter |
| Group | Ananke group |
| Physical characteristics | |
| Mean diameter | 4 km |
| Apparent magnitude | 22.6 |
Helike /ˈhɛləkiː/, also known as Jupiter XLV, is a moon of Jupiter. It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2003, and given the temporary designation S/2003 J 6.[5][6][7]
Helike is about 4 kilometres in diameter, and orbits Jupiter at an average distance of 20.54 million kilometres in 601.402 days, at an inclination of 155° to the ecliptic (156° to Jupiter's equator), in a retrograde direction and with an eccentricity of 0.1375. Its average orbital speed is 2.48 km/s.
It was named in March 2005 after Helike, one of the nymphs that nurtured Zeus (Jupiter) in his infancy on Crete.[8]
Helike belongs to the Ananke group.
References
- ↑ Helice (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=Helice (Subscription or UK public library membership required.)
- ↑ as 'Helice' in Noah Webster (1884) A Practical Dictionary of the English Language
- ↑ Hutchinson (1980) "Base Metal Sulfides", The Continental Crust and Its Mineral Deposits: The Proceedings of a Symposium Held in Honour of J. Tuzo Wilson, Held at Toronto, May 1979, p. 679
- ↑ S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
- ↑ Daniel W. E. Green (March 4, 2003). "IAUC 8087: Satellites of Jupiter". International Astronomical Union. http://www.cbat.eps.harvard.edu/iauc/08000/08087.html.
- ↑ Brian G. Marsden (March 4, 2003). "MPEC 2003-E11 : S/2003 J 1, 2003 J 2, 2003 J 3, 2003 J 4, 2003 J 5, 2003 J 6, 2003 J 7". International Astronomical Union Minor Planet Center. http://www.minorplanetcenter.net/iau/mpec/K03/K03E11.html.
- ↑ Brian G. Marsden (March 7, 2003). "MPEC 2003-E29 : S/2003 J 9, 2003 J 10, 2003 J 11, 2003 J 12; S/2003 J 1, 2003 J 6". International Astronomical Union Minor Planet Center. http://www.minorplanetcenter.net/iau/mpec/K03/K03E29.html.
- ↑ Daniel W. E. Green (March 30, 2005). "IAUC 8502: Satellites of Jupiter". International Astronomical Union. http://www.cbat.eps.harvard.edu/iauc/08500/08502.html.
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