Eupheme (moon)

Eupheme
	Images of Eupheme by the Canada-France-Hawaii Telescope in February 2003
Discovery
Discovered by	Scott S. Sheppard
Discovery date	2003
Designations
Designation	Jupiter LX
Pronunciation	/juːˈfiːmiː/
Named after	Ευφήμη Eyphēmē
Alternative names	S/2003 J 3
Adjectives	Euphemean /juːfɪˈmiːən/
Orbital characteristics
Semi-major axis	21199710 km
Eccentricity	0.253
Orbital period (sidereal)	−628.06 days
Mean anomaly	168.7°
Inclination	148.0°
Longitude of ascending node	292.0°
Argument of perihelion	109.0°
Satellite of	Jupiter
Group	Ananke group
Physical characteristics
Mean diameter	2 km
Apparent magnitude	23.4

Eupheme /juːˈfiːmiː/, also Jupiter LX, originally known as S/2003 J 3, 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.^[5]^[6] The moon was lost following its discovery in 2003.^[7]^[8]^[9]^[10] It was recovered in 2017 and given its permanent designation that year.^[11]

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.^[12] 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.^[13]^[14]

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°.

References

^ Noah Webster (1884) A Practical Dictionary of the English Language
^ James Petigru Carson (1920) Life, Letters and Speeches of James Louis Petigru, p. 318
^ S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
^ "M.P.C. 106351" (PDF). Minor Planet Circular. Minor Planet Center. 10 May 2017. S/2003 J 3.
^ Daniel W. E. Green (4 March 2003). "IAUC 8087: Satellites of Jupiter". International Astronomical Union.
^ 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 4 March 2003 (discovery and ephemeris)
^ Beatty, Kelly (4 April 2012). "Outer-Planet Moons Found — and Lost". www.skyandtelescope.com. Sky & Telescope. Retrieved 27 June 2017.
^ Brozović, Marina; Jacobson, Robert A. (9 March 2017). "The Orbits of Jupiter's Irregular Satellites". The Astronomical Journal. 153 (4): 147. Bibcode:2017AJ....153..147B. doi:10.3847/1538-3881/aa5e4d.
^ Jacobson, B.; Brozović, M.; Gladman, B.; Alexandersen, M.; Nicholson, P. D.; Veillet, C. (28 September 2012). "Irregular Satellites of the Outer Planets: Orbital Uncertainties and Astrometric Recoveries in 2009–2011". The Astronomical Journal. 144 (5): 132. Bibcode:2012AJ....144..132J. doi:10.1088/0004-6256/144/5/132. S2CID 123117568.
^ Sheppard, Scott S. (2017). "New Moons of Jupiter Announced in 2017". home.dtm.ciw.edu. Retrieved 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.
^ Sheppard, Scott S. (2017). "Jupiter's Known Satellites". home.dtm.ciw.edu. Archived from the original on 18 March 2015. Retrieved 10 August 2017.
^ "Planet and Satellite Names and Discoverers". USGS Astrogeology Science Center. Retrieved 27 August 2019.
^ "Naming Contest for Newly-discovered Moons of Jupiter". www.iau.org. Retrieved 27 August 2019.
^ "Public Contest Successfully Finds Names For Jupiter's New Moons". www.iau.org. Retrieved 27 August 2019.

[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] S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line

[MPC106351-4] "M.P.C. 106351" (PDF). Minor Planet Circular. Minor Planet Center. 10 May 2017. S/2003 J 3.

[5] Daniel W. E. Green (4 March 2003). "IAUC 8087: Satellites of Jupiter". International Astronomical Union.

[6] 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 4 March 2003 (discovery and ephemeris)

[7] Beatty, Kelly (4 April 2012). "Outer-Planet Moons Found — and Lost". www.skyandtelescope.com. Sky & Telescope. Retrieved 27 June 2017.

[Jacobson-8] Brozović, Marina; Jacobson, Robert A. (9 March 2017). "The Orbits of Jupiter's Irregular Satellites". The Astronomical Journal. 153 (4): 147. Bibcode:2017AJ....153..147B. doi:10.3847/1538-3881/aa5e4d.

[9] Jacobson, B.; Brozović, M.; Gladman, B.; Alexandersen, M.; Nicholson, P. D.; Veillet, C. (28 September 2012). "Irregular Satellites of the Outer Planets: Orbital Uncertainties and Astrometric Recoveries in 2009–2011". The Astronomical Journal. 144 (5): 132. Bibcode:2012AJ....144..132J. doi:10.1088/0004-6256/144/5/132. S2CID 123117568.

[10] Sheppard, Scott S. (2017). "New Moons of Jupiter Announced in 2017". home.dtm.ciw.edu. Retrieved 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.

[11] Sheppard, Scott S. (2017). "Jupiter's Known Satellites". home.dtm.ciw.edu. Archived from the original on 18 March 2015. Retrieved 10 August 2017.

[name-12] "Planet and Satellite Names and Discoverers". USGS Astrogeology Science Center. Retrieved 27 August 2019.

[13] "Naming Contest for Newly-discovered Moons of Jupiter". www.iau.org. Retrieved 27 August 2019.

[14] "Public Contest Successfully Finds Names For Jupiter's New Moons". www.iau.org. Retrieved 27 August 2019.

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v t e Moons of Jupiter
Listed in increasing approximate distance from Jupiter
Inner moons	Metis Adrastea Amalthea Thebe
Galilean moons	Io Europa Ganymede Callisto
Themisto	Themisto
Himalia group (9)	Leda Ersa S/2018 J 2 Himalia Pandia Lysithea Elara S/2011 J 3 Dia
Carpo group (2)	S/2018 J 4 Carpo
Valetudo	Valetudo
Ananke group (26)	Euporie Jupiter LV Eupheme S/2021 J 3 Jupiter LII Jupiter LIV Mneme Euanthe S/2003 J 16 Harpalyke Orthosie S/2022 J 3 Helike S/2021 J 2 Praxidike Jupiter LXIV S/2021 J 1 S/2003 J 12 Jupiter LXVIII Thelxinoe Thyone S/2003 J 2 Ananke Iocaste Hermippe Jupiter LXX
Carme group (30)	S/2022 J 1 S/2022 J 2 S/2016 J 3 Pasithee Jupiter LXIX S/2021 J 6 S/2003 J 24 Chaldene Jupiter LXIII Isonoe S/2021 J 4 Kallichore Erinome Kale Eirene Aitne Eukelade Arche Taygete Jupiter LXXII Carme Herse Jupiter LXI Jupiter LI S/2003 J 9 Jupiter LXVI Kalyke S/2018 J 3 S/2021 J 5 S/2003 J 10
Pasiphae group (18)	Philophrosyne Eurydome Jupiter LVI S/2003 J 4 S/2016 J 4 Jupiter LXVII Hegemone Pasiphae Sponde Megaclite Cyllene Sinope Jupiter LIX Aoede Autonoe Callirrhoe S/2003 J 23 Kore
See also	Rings of Jupiter Jupiter's moons in fiction
Category