Dia (moon)

Short description: Outer moon of Jupiter

DiaDiscovery

Discovered by| Scott S. Sheppard, David C. Jewitt, Yanga R. Fernández, and Eugene A. Magnier
Discovery site| Mauna Kea Obs.
Discovery date| 5 December 2000
11 September 2012 (rediscovery)
Designations

Designation

| Jupiter LIII
Pronunciation| /ˈdaɪ.ə/[1]
Named after| Δῖα Dīa

Alternative names

| S/2000 J 11
Adjectives| Dian /ˈdaɪ.ən/
Orbital characteristics [2]

Semi-major axis

| 12118000 km
Eccentricity| 0.211
Orbital period| +287.0 days
Mean anomaly| 169.9°
Inclination| 28.23°
Longitude of ascending node| 290.9°

|{{{apsis}}}|helion}}

| 178.0°
Satellite of| Jupiter
Group| Himalia group
Physical characteristics
Mean diameter| 4 km
Apparent magnitude| 22.4

Dia /ˈdaɪ.ə/, also known as Jupiter LIII, is a prograde irregular satellite of Jupiter. Provisionally known as S/2000 J 11, it received its name on March 7, 2015.[3] It is named after Dia, daughter of Deioneus (or Eioneus), wife of Ixion. According to Homer, she was seduced by Zeus in stallion form; Pirithous was the issue.

The satellite is one of several known small bodies in the Himalia group.[4]

Dia is thought to be about 4 kilometres in diameter.[5] It orbits Jupiter at an average distance of 12 million km in 274 days, at an inclination of 28° (to Jupiter's equator), and with an eccentricity of 0.21.[6]

## Observational history

Dia imaged by the Canada-France-Hawaii Telescope in December 2001. In the second frame Dia is not visible due to Jupiter's glare reducing the relative brightnesses of the stars.

Dia was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2000 with an observation arc of 26 days.[7][8]

Initial observations were not followed up, and Dia was not observed for more than a decade after 2000. This apparent disappearance led some astronomers to consider the moon lost.[9] One theory was that it had crashed into Himalia, creating a faint ring around Jupiter.[10] However, it was finally recovered in observations made in 2010 and 2011.[6]

## References

1. ↑ Noah Webster (1884) A Practical Dictionary of the English Language
2. ↑ S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
3. ↑ CBET (Central Bureau Electronic Telegram) 4075: 20150307: Satellites of Jupiter, March 7, 2015
4. ↑ Sheppard, S. S.; Jewitt, D. C.; An abundant population of small irregular satellites around Jupiter , Nature, 423 (May 2003), pp. 261–263
5. ↑ Sheppard, S. S.; Jewitt, D. C.; Porco, C.; Jupiter's outer satellites and Trojans , in Jupiter: The planet, satellites and magnetosphere, edited by Fran Bagenal, Timothy E. Dowling, William B. McKinnon, Cambridge Planetary Science, Vol. 1, Cambridge, UK: Cambridge University Press, ISBN 0-521-81808-7, 2004, pp. 263-280
6. ↑ 6.0 6.1 Williams, Gareth V. (2012-09-11). "MPEC 2012-R22 : S/2000 J 11". Minor Planet Center. http://www.minorplanetcenter.net/mpec/K12/K12R22.html.
7. ↑ Daniel W. E. Green (January 5, 2001). "IAUC 7555: Satellites of Jupiter". International Astronomical Union. http://www.cbat.eps.harvard.edu/iauc/07500/07555.html.
8. ↑ Brian G. Marsden (January 15, 2001). "MPEC 2001-A29: S/2000 J 7, S/2000 J 8, S/2000 J 9, S/2000 J 10, S/2000 J 11". International Astronomical Union Minor Planet Center. http://www.minorplanetcenter.org/mpec/K01/K01A29.html.
9. ↑ "FAQ: Why don't you have Jovian satellite S/2000 J11 in your system?". JPL Solar System Dynamics. http://ssd.jpl.nasa.gov/?faq#A07.
10. ↑ "Lunar marriage may have given Jupiter a ring", New Scientist, March 20, 2010, p. 16.(Subscription content?)

## External links

* Natural Satellites Ephemeris Service Minor Planet Center
* Planetary Satellite Mean Orbital Parameters NASA JPL
* Scott Sheppard pages
* David Jewitt pages

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Moons of Jupiter

Listed in approximately increasing distance from Jupiter. Provisional designations in italics.

Inner moons|

* Metis
* Adrastea
* Amalthea
* Thebe

Galilean moons|

* Io
* Europa
* Ganymede
* Callisto

Themisto group|

* Themisto

Himalia group|

* Leda
* Himalia
* Ersa
* Pandia
* Lysithea
* Elara
* Dia

Carpo group|

* Carpo

Valetudo group|

* Valetudo

Ananke group|

* S/2003 J 12(?)
* Euporie
* Eupheme
* Jupiter LV
* Jupiter LII
* Thelxinoe
* Euanthe
* Helike
* Orthosie
* Jupiter LXVIII
* Jupiter LIV
* Jupiter LXIV
* Iocaste
* S/2003 J 16(?)
* Praxidike
* Harpalyke
* Mneme
* Hermippe
* Thyone
* Jupiter LXX
* Ananke

Carme group|

* Jupiter LXXII
* Herse
* Aitne
* Kale
* Taygete
* Jupiter LXI
* Chaldene
* S/2003 J 10(?)
* Erinome
* Kallichore
* Jupiter LXVI
* Jupiter LXIX
* Kalyke
* Carme
* Jupiter LXIII
* Pasithee
* Jupiter LI
* Eukelade
* Arche
* Isonoe
* S/2003 J 9(?)
* Eirene

Pasiphae group|

* Jupiter LXVII
* Philophrosyne
* S/2003 J 23(?)
* Aoede
* Callirrhoe
* Eurydome
* Kore
* Cyllene
* Jupiter LVI
* Jupiter LIX
* S/2003 J 4(?)
* Pasiphae
* Hegemone
* Sinope
* Sponde
* Autonoe
* Megaclite
* S/2003 J 2(?)

* Rings of Jupiter
* In fiction

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