S / 2014 (130) 1

(130) Elektra II (S / 2014 (130) 1)
Provisional or systematic name	S / 2014 (130) 1
Central body	(130) Electra
Properties of the orbit
Major semi-axis	460 km
Periapsis	414 km
Apoapsis	506 km
eccentricity	~ 0.10
Orbit inclination	46 °
Orbital time	1.1 d
Physical Properties
Albedo	≈ 0.071 ± 0.011
Medium diameter	5.2 ± 1.2 km
Medium density	≈ 1.3 ± 0.3 g / cm ³
Surface temperature	157 K
discovery
Explorer	Am yang Z. Wahhaj M. Marsset J. Milli Christophe Dumas Franck Marchis
Date of discovery	December 6, 2014
Remarks	Smaller moon of the Elektra system

S / 2014 (130) 1 is the inner and smaller of the two moons of the main belt asteroid (130) Elektra . Its mean diameter is 5.2 kilometers.

Discovery and naming

S / 2014 (130) 1 was viewed on December 6, 2014 by Bin Yang, Z. Wahhaj, M. Marsset, J. Milli, Christophe Dumas and Franck Marchis with the 8.2 m "Melipal" VLT telescope discovered the Cerro Paranal in Chile . The discovery was announced on December 16, 2014; the moon was given the provisional designation S / 2014 (130) 1 .

As early as 2001 it was discovered the 10-m Keck telescope II a further companion of Elektra, making the system known for the sixth asteroid multiple system in the main belt and was the tenth overall.

Track properties

S / 2014 (130) 1 orbits Elektra in an elliptical orbit at an average distance of 460 kilometers from its center (about 5 Elektra radii). The orbit eccentricity is around 0.1, the orbit is inclined 46 ° to the pole of Elektra. The orbit of the outer moon S / 2003 (130) 1 is on average about 858 km from the orbit of S / 2014 (130) 1.

S / 2014 (130) 1 orbits Elektra in an estimated 26.4 hours, which corresponds to about 1839 orbits in one Elektra year (around 5.5 earth years). The orbit of S / 2016 (107) 1 is assumed to be stable because it is well within Electra's Hill radius of 38,000 km, but also well outside of the synchronous orbit.

Physical Properties

S / 2014 (130) 1 has a diameter of 5.2 km (about 1/35 of the central body), based on the assumed equal reflectivity of 7% corresponding to the Elektra . The surface is therefore extremely dark.

Assuming a mean diameter of 5.2 km, the surface area is around 85 km ² , which is just about the area of Lake Zurich in Switzerland .

Provisions of the diameter for S / 2014 (130) 1

year	Dimensions km	source
2015	5.2 ± 1.2	Johnson
2016	2.0 ± 1.5	Yang et al.

The most precise determination is marked in bold .

internal structure

Since S / 2014 (130) 1 has a similar color to the mother body, it is assumed that the moon is made of the same material as Elektra and therefore has the same spectral type (G or Ch).

The mean surface temperature is around 157 K (−116 ° C) and can rise to a maximum of 251 K (−22 ° C) at noon; at night it can drop to 63 K (−210 ° C).

Web links

Wm. Robert Johnston: (130) Elektra, S / 2003 (130) 1, and S / 2014 (130) 1 (English)
ESO: Elektra: A new triple asteroid with photo

Individual evidence

↑ Bin Yang et al .: Elektra: Ein neue Dreifachasteroid (2016). Retrieved September 10, 2017 .
^ Wm. Robert Johnson: (130) Elektra, S / 2003 (130) 1, and S / 2014 (130) 1 (March 2015). Retrieved September 10, 2017 .
↑ Bin Yang et al .: Extreme AO Observations of Two Triple Asteroid Systems with SPHERE (March 2016). Retrieved September 10, 2017 .

[yang-1] Bin Yang et al .: Elektra: Ein neue Dreifachasteroid (2016). Retrieved September 10, 2017 .

[johnson-2] Wm. Robert Johnson: (130) Elektra, S / 2003 (130) 1, and S / 2014 (130) 1 (March 2015). Retrieved September 10, 2017 .

[yang2-3] Bin Yang et al .: Extreme AO Observations of Two Triple Asteroid Systems with SPHERE (March 2016). Retrieved September 10, 2017 .