Philophrosyne (moon)

Philophrosyne
Discovery
Discovered by	Scott Sheppard et al.
Discovery date	2003
Designations
Designation	Jupiter LVIII
Pronunciation	/fɪləˈfrɒsəniː/ or /-ˈfrɒzəniː/
Named after	Φιλοφροσύνη Philophrosynē
Alternative names	S/2003 J 15
Adjectives	Philophrosynean /fɪˌlɒfrəzəˈniːən/
Orbital characteristics
Semi-major axis	22819950 km
Eccentricity	0.194
Orbital period (sidereal)	−701.3 days
Inclination	143.6°
Satellite of	Jupiter
Group	Pasiphae group
Physical characteristics
Mean diameter	2 km
Apparent magnitude	23.5

Philophrosyne (/fɪləˈfrɒsəniː/ or /fɪləˈfrɒzəniː/), also Jupiter LVIII and provisionally known as S/2003 J 15, is a natural satellite of Jupiter. It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard, et al. in 2003,^[2]^[3] but then lost.^[4]^[5]^[6]^[7] It was recovered in 2017 and given its permanent designation that year.^[8]

Characteristics

Philophrosyne is about 2 kilometres in diameter, and orbits Jupiter at an average distance of 22,721,000 km in 699.676 days, at an inclination of 142° to the ecliptic (142° to Jupiter's equator), in a retrograde direction and with an eccentricity of 0.0932.

It belongs to the Pasiphae group, retrograde irregular moons that orbit Jupiter between 22.8 and 24.1 Gm, at inclinations of roughly 150-155°.

Name

The moon was named in 2019 after Philophrosyne (Φιλοφροσύνη), the ancient Greek spirit of welcome, friendliness, and kindness, the daughter of Hephaestus and Aglaea and granddaughter of Zeus. The name originated from a naming contest held on Twitter where it is suggested by users including CHW3M Myth Experts (@Chw3mmyths) which is an 11th-grade history class studying Greek and Roman philosophy as of 2019, Victoria (@CharmedScribe), and Lunartic (@iamalunartic) who has concurrently helped in naming another Jovian moon Eupheme.^[9]^[10]^[11]

References

^ S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
^ IAUC 8116: Satellites of Jupiter and Saturn Archived 2006-05-05 at the Wayback Machine 2003 April (discovery)
^ MPEC 2003-G17: S/2003 J 15 2003 April (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] S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line

[2] IAUC 8116: Satellites of Jupiter and Saturn Archived 2006-05-05 at the Wayback Machine 2003 April (discovery)

[3] MPEC 2003-G17: S/2003 J 15 2003 April (discovery and ephemeris)

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

[Jacobson-5] 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.

[6] 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.

[7] 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.

[8] 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-9] "Planet and Satellite Names and Discoverers". USGS Astrogeology Science Center. Retrieved 27 August 2019.

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

[11] "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