Zoe (moon)
(58534) Logos I (Zoe) | |
---|---|
Provisional or systematic name | S / 2001 (58534) 1 |
Central body | (58534) Logos |
Properties of the orbit | |
Major semi-axis | (8010 ± 80) km |
Periapsis | 4405 km |
Apoapsis | 11,614 km |
eccentricity | 0.45 ± 0.03 |
Orbit inclination | (121.5 ± 2.0) ° (ecliptic) ° |
Orbital time | (312 ± 3) d |
Mean orbital velocity | 0.0009 km / s |
Physical Properties | |
Medium diameter | 66 km |
Dimensions | (1.5 ± 0.2) 10 17 kg |
Acceleration of gravity on the surface | ≈ 0 m / s 2 |
Escape speed | ≈ 0 m / s |
discovery | |
Explorer |
|
Date of discovery | November 17, 2001 |
Remarks | Smaller component of a double asteroid. |
Zoe is the smaller component ( moon ) of the double asteroid system of the Kuiper belt asteroid and Cubewanos (58534) logos . Its mean diameter is around 66 kilometers, which is only about 14.3% smaller than the mother asteroid .
Discovery and naming
Zoe was observed on November 17, 2001 by Keith S. Noll, Denise C. Stephens, Will M. Grundy, John Spencer, Robert L. Millis, Marc W. Buie, Dale Cruikshank, Stephen C. Tegler, and William Romanishin during observations with the Hubble Space Telescope discovered. Zoe was found at 0.045 arc seconds from the Typhon discovered four years earlier, with a difference in apparent magnitude of 0.42. The discovery was announced on February 11, 2002; the companion was given the provisional designation S / 2001 (58534) 1 .
On November 23, 2006, together with the Typhon / Echidna and Ceto / Phorcys systems , the two bodies were officially named after Logos and Zoe by the International Astronomical Union (IAU). In the Gnostic tradition these are a couple.
Track properties
Zoe orbits Logos in a prograde , very elliptical orbit between 4405 and 11 614 km from its center (major orbit half-axis 8010 km or approx. 200.3 Logos or 242.7 zoeradiums). Since both revolve around the common center of gravity , the system is to be understood as a double asteroid system. The orbit eccentricity is 0.45, the orbit is inclined 121.5 ° to the ecliptic .
Zoe and Logos orbit each other in 312 days, which corresponds to about 359.4 orbits in a Logos year (about 307 earth years).
Physical Properties
Zoe has an estimated 66 km (about 85.7% of the central body) in diameter based on the assumed equal reflectivity of 39% ± 17% based on the logo , which is exceptionally high for a small KBO .
exploration
Since its discovery in 2001, Zoe has been observed through the Hubble Space Telescope as well as through terrestrial telescopes and its orbital elements have been determined.
See also
Web links
- Wm. Robert Johnston: (58534) Logos and Zoe
- Monde.de: Two pictures by Logos and Zoe
- International Astronomical Union Circular No. 7824 February 11, 2002 (Discovery)
- International Astronomical Union Circular No. 7959 August 26, 2002 (confirmation of discovery)
- International Astronomical Union Circular No. 8778 November 23, 2006 (designation)