Eupheme (moon)
Eupheme | |
---|---|
Provisional or systematic name | S / 2003 J 3 |
Central body | Jupiter |
Properties of the orbit | |
Major semi-axis | 20,224,000 km |
Periapsis | 16,242,000 km |
Apoapsis | 24,206,000 km |
eccentricity | 0.1969 |
Orbit inclination | 147.541 ° |
Orbital time | 583.88 d |
Mean orbital velocity | 2.49 km / s |
Physical Properties | |
Albedo | 0.04 |
Apparent brightness | 23.4 mag |
Medium diameter | ≈ 2 km |
Dimensions | ≈ 1.1 * 10 13 kg |
Medium density | 2.6 g / cm 3 |
Acceleration of gravity on the surface | ≈ 0 m / s 2 |
Escape speed | ≈ 0 m / s |
discovery | |
Explorer |
University of Hawaii |
Date of discovery | February 5, 2003 |
Eupheme (also Jupiter LX ) is one of the smaller moons of the planet Jupiter .
discovery
Eupheme was discovered on February 5, 2003 by astronomers at the University of Hawaii and was given the provisional designation S / 2003 J 3. On August 23, 2019, it was named by the International Astronomical Union after Eupheme , a figure in Greek mythology .
Orbit data
Eupheme orbits Jupiter at an average distance of 20,224,000 km in 583.88 days. The track has an eccentricity of 0.1969. With an inclination of 147.5 ° from the local Laplace plane , the orbit is retrograde, i.e. that is, the moon moves around the planet against the direction of rotation of Jupiter.
Due to its orbital properties, Eupheme is assigned to the Ananke group , named after the Jupiter moon Ananke .
Physical data
Eupheme has a diameter of about 2 km. Their density is estimated at 2.6 g / cm³. It is probably made up mainly of silicate rock. It has a very dark surface with an albedo of 0.04, i.e. that is, only 4% of the incident sunlight is reflected. Their apparent brightness is 23.4 m .
Web links
- IAUC 8087: Satellites of Jupiter March 4, 2003 (discovery)
- 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 March 4, 2003 (discovery)
- MPEC-N78: S / 2003 J3 July 15, 2017 (rediscovery)
- MPC 106505 October 5, 2017 (numbering)
Individual evidence
- ↑ The results are in! Jovian moon-naming contest winners announced. Carnegie Institution for Science, August 23, 2019; accessed August 28, 2019 .
before | Jupiter moons | after that |
S / 2003 J 2 | Eupheme (moon) |
S / 2003 J 4 |