Styx (moon)

Styx
	Pluto's moon Styx, as seen by the New Horizons spacecraft on 13 July 2015, from a distance of 632,000 km
Discovery
Discovered by	Showalter, M. R. et al.
Discovery site	Hubble Space Telescope
Discovery date	26 June 2012; (verified 7 July 2012);
Detection method	Photographic
Designations
Designation	Pluto V
Pronunciation	/ˈstɪks/
Named after	Στύξ Styx
Alternative names	S/2012 (134340) 1; S/2012 P 1
Adjectives	Stygian /ˈstɪdʒiən/
Orbital characteristics
Semi-major axis	42656±78 km
Eccentricity	0.005787±0.001144
Orbital period (sidereal)	20.16155±0.00027 d
Inclination	0.809°±0.162°
Satellite of	Pluto
Physical characteristics
Dimensions	16 × 9 × 8 km
Mass	7.5×1015 kg
Sidereal rotation period	3.24 ± 0.07 d (chaotic)
Axial tilt	82° (to orbital plane)
Albedo	0.65 ± 0.07 geometric
Apparent magnitude	27±0.3

Styx is a small natural satellite of Pluto whose discovery was announced on 11 July 2012. It was discovered by use of the Hubble Space Telescope, and is the smallest of the five known moons of Pluto. It was imaged along with Pluto and Pluto's other moons by the New Horizons spacecraft in July 2015, albeit poorly with only a single image of Styx obtained.^[5]

Styx is the second-closest known satellite to Pluto, and the fifth discovered. It was discovered one year after Kerberos. Styx is approximately 16 km (9.9 mi) across its longest dimension,^[5] and its orbital period is 20.1 days.

^ "Styx". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
^ Scott S. Sheppard, Pluto Moons
^ "Stygian". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
^ Cite error: The named reference ShowalterHamilton2015 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e "Special Session: Planet 9 from Outer Space – Pluto Geology and Geochemistry". Lunar and Planetary Institute. 25 March 2016. Retrieved 27 May 2019 – via YouTube.
^ Johnston, Robert. "(134340) Pluto, Charon, Nix, Hydra, Kerberos, and Styx". Asteroids with Satellites Database—Johnston's Archive. Retrieved 7 March 2016.
^ "DPS 2015: Pluto's small moons Styx, Nix, Kerberos, and Hydra [UPDATED]". planetary.org.
^ Cite error: The named reference Sanders 2012-07-11 was invoked but never defined (see the help page).
^ Cite error: The named reference S&T12 was invoked but never defined (see the help page).

[1] "Styx". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)

[Sheppard-2] Scott S. Sheppard, Pluto Moons

[3] "Stygian". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)

[ShowalterHamilton2015-4] Cite error: The named reference ShowalterHamilton2015 was invoked but never defined (see the help page).

[LPSC-5] "Special Session: Planet 9 from Outer Space – Pluto Geology and Geochemistry". Lunar and Planetary Institute. 25 March 2016. Retrieved 27 May 2019 – via YouTube.

[6] Johnston, Robert. "(134340) Pluto, Charon, Nix, Hydra, Kerberos, and Styx". Asteroids with Satellites Database—Johnston's Archive. Retrieved 7 March 2016.

[Lakdawalla1110-7] "DPS 2015: Pluto's small moons Styx, Nix, Kerberos, and Hydra [UPDATED]". planetary.org.

[Sanders_2012-07-11-8] Cite error: The named reference Sanders 2012-07-11 was invoked but never defined (see the help page).

[S&T12-9] Cite error: The named reference S&T12 was invoked but never defined (see the help page).

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Discovery
Pluto's moon Styx, as seen by the New Horizons spacecraft on 13 July 2015, from a distance of 632,000 km
Discovered by	Showalter, M. R. et al.
Discovery site	Hubble Space Telescope
Discovery date	26 June 2012 (verified 7 July 2012)
Detection method	Photographic
Designations
Designation	Pluto V
Pronunciation	/ˈstɪks/^[1]
Named after	Στύξ Styx
Alternative names	S/2012 (134340) 1 S/2012 P 1^[2]
Adjectives	Stygian /ˈstɪdʒiən/^[3]
Orbital characteristics^[4]
Semi-major axis	42656±78 km
Eccentricity	0.005787±0.001144
Orbital period (sidereal)	20.16155±0.00027 d
Inclination	0.809°±0.162°
Satellite of	Pluto
Physical characteristics
Dimensions	16 × 9 × 8 km^[5]
Mass	7.5×10¹⁵ kg^[6]
Sidereal rotation period	3.24 ± 0.07 d (chaotic)^[5]
Axial tilt	82°^[7] (to orbital plane)
Albedo	0.65 ± 0.07 geometric^[5]
Apparent magnitude	27±0.3^[8]^[9]