Cyllene (moon)
| Discovery | |
|---|---|
| Discovered by | Scott S. Sheppard et al. |
| Discovery date | 2003 |
| Designations | |
Designation | Jupiter XLVIII |
| Pronunciation | /səˈliːniː/[1] |
Named after | Κυλλήνη Kyllēnē |
| S/2003 J 13 | |
| Adjectives | Cyllenean /sɪləˈniːən/[a] |
| Orbital characteristics[4] | |
| Epoch 2026-01-01 | |
| Observation arc | 16 years 2018-04-18 (last obs) |
| Periapsis | 13.9 million km |
| Apoapsis | 33.83 million km |
| 23.9 million km | |
| Eccentricity | 0.416 |
| −754.4 days | |
| Inclination | 144.5° |
| Satellite of | Jupiter |
| Group | Pasiphae group |
| Physical characteristics | |
| 2 km[5] | |
Spectral type | B–V = 0.73 ± 0.07 V–R = 0.46 ± 0.07[6] |
| 23.2 | |
| 16.34 (28 obs)[7] | |
Cyllene /səˈliːniː/, also known as Jupiter XLVIII, is an irregular satellite of Jupiter. It was discovered by a team of astronomers from the University of Hawaiʻi led by Scott S. Sheppard in 2003, receiving the temporary designation S/2003 J 13.[8][9] It gets as far as 33.8 million kilometres (21,000,000 mi) from Jupiter.[4]
Cyllene is about 2 kilometres (1.2 mi) in diameter, and orbits Jupiter at an average distance of 23.9 million kilometres (14,900,000 mi) in 754 days (2.06 yr), at an inclination of 145° to the ecliptic, in a retrograde direction and with an eccentricity of 0.416.[4] The orbital elements are continuously changing due to solar and planetary perturbations. In October 2014, the moon reached 0.253 AU (37.8 million km; 23.5 million mi) from Jupiter,[10] and in October 2015 approached within 0.0616 AU (9.22 million km; 5.73 million mi) of Jupiter.[11]
It was named in March 2005 after Cyllene, a naiad (stream nymph) or oread (mountain nymph) associated with Mount Cyllene, Greece.[12] She was a daughter of Zeus (Jupiter).
It belongs to the Pasiphae group, irregular retrograde moons orbiting Jupiter at distances ranging between 22.8 million kilometres (14,200,000 mi) and 24.1 million kilometres (15,000,000 mi), and with inclinations ranging between 144.5° and 158.3°.
Notes
References
- ^ Noah Webster (1884) A Practical Dictionary of the English Language
- ^ Thomas Chase (1882) Six books of the Æneid of Virgil (1877), p. 252
- ^ "Cyllenian". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
- ^ a b c Horizons output. "Jovian Osculating Orbital Elements for Cyllene (548)". Retrieved 2025-12-19.
- ^ S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
- ^ Graykowski, Ariel; Jewitt, David (2018-04-05). "Colors and Shapes of the Irregular Planetary Satellites". The Astronomical Journal. 155 (4): 184. arXiv:1803.01907. doi:10.3847/1538-3881/aab49b. ISSN 1538-3881.
- ^ MPC Natural Satellites (Select: Orbital Elements)
- ^ IAUC 8116: Satellites of Jupiter and Saturn Archived 2006-05-05 at the Wayback Machine 2003 April (discovery)
- ^ MPEC 2003-G09: S/2003 J 13 2003 April (discovery and ephemeris)
- ^ "Apojove on 2014-Oct-30". JPL Horizons. Retrieved 2026-02-02.
- ^ "Perijove on 2015-Oct-05". JPL Horizons. Retrieved 2026-02-02.
- ^ IAUC 8502: Satellites of Jupiter 2005 March (naming the moon)