Eupheme (moon) explained

Eupheme
Pronounced:	^[1]
Adjective:	Euphemean ^[2]
Named After:	Ευφήμη Eyphēmē
Discoverer:	Scott S. Sheppard
Discovered:	2003
Mpc Name:	Jupiter LX
Alt Names:	S/2003 J 3
Orbit Ref:	 ^[3]
Inclination:	148.0°
Eccentricity:	0.253
Arg Peri:	109.0°
Asc Node:	292.0°
Mean Anomaly:	168.7°
Period:	−628.06 days
Satellite Of:	Jupiter
Group:	Ananke group
Magnitude:	23.4
Mean Diameter:	2 km

Eupheme, also Jupiter LX, originally known as , is an outer natural satellite of Jupiter, 2 km in diameter.

Discovery

It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2003.^{[4] [5]} The moon was lost following its discovery in 2003.^{[6] [7] [8] [9]} It was recovered in 2017 and given its permanent designation that year.^[10]

Name

It was named in 2019 after Eupheme, the ancient Greek spirit of words of good omen, praise, acclaims, shouts of triumph, and applause, the daughter of Hephaestus and Aglaea and granddaughter of Zeus.^[11] The name was suggested by Twitter user Lunartic (@iamalunartic) in a naming contest held by the Carnegie Institute on the social network who concurrently helped in naming another Jovian moon Philophrosyne.^{[12] [13]}

Orbit

Eupheme orbits Jupiter at an average distance of 19,622 Mm in 628.06 days, at an inclination of 146° to the ecliptic (146° to Jupiter's equator), in a retrograde direction and with an eccentricity of 0.2507. It belongs to the Ananke group, retrograde irregular moons that orbit Jupiter between 19.3 and 22.7 Gm, at inclinations of roughly 150°.

Notes and References

1. Noah Webster (1884) A Practical Dictionary of the English Language
2. James Petigru Carson (1920) Life, Letters and Speeches of James Louis Petigru, p. 318
3. https://sites.google.com/carnegiescience.edu/sheppard/moons/jupitermoons S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
4. Web site: Daniel W. E. Green . IAUC 8087: Satellites of Jupiter . . 4 March 2003.
5. http://www.minorplanetcenter.net/iau/mpec/K03/K03E11.html 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
6. Web site: Outer-Planet Moons Found — and Lost . Beatty . Kelly . 4 April 2012 . www.skyandtelescope.com . . 27 June 2017.
7. Brozović . Marina . Jacobson . Robert A. . 9 March 2017 . The Orbits of Jupiter's Irregular Satellites . The Astronomical Journal . 153 . 4 . 147 . 10.3847/1538-3881/aa5e4d. 2017AJ....153..147B . free .
8. Jacobson . B. . Brozović . M. . B. . Gladman . M. . Alexandersen . P. D. . Nicholson . C. . Veillet . 28 September 2012 . Irregular Satellites of the Outer Planets: Orbital Uncertainties and Astrometric Recoveries in 2009–2011 . The Astronomical Journal . 144 . 5 . 132 . 10.1088/0004-6256/144/5/132 . 2012AJ....144..132J . 123117568 . free .
9. Web site: New Moons of Jupiter Announced in 2017 . Sheppard . Scott S. . 2017 . home.dtm.ciw.edu . 27 June 2017 . We likely have all of the lost moons in our new observations from 2017, but to link them back to the remaining lost 2003 objects requires more observations a year later to confirm the linkages, which will not happen until early 2018. ... There are likely a few more new moons as well in our 2017 observations, but we need to reobserve them in 2018 to determine which of the discoveries are new and which are lost 2003 moons..
10. Web site: Jupiter's Known Satellites . Sheppard . Scott S. . 2017 . home.dtm.ciw.edu . 10 August 2017 . https://web.archive.org/web/20150318034833/http://home.dtm.ciw.edu/users/sheppard/satellites/jupsatdata.html . 18 March 2015 . dead .
11. Web site: Planet and Satellite Names and Discoverers . . 27 August 2019.
12. Web site: Naming Contest for Newly-discovered Moons of Jupiter . www.iau.org . 27 August 2019.
13. Web site: Public Contest Successfully Finds Names For Jupiter's New Moons . www.iau.org . 27 August 2019.