Leda (moon)

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
Discovered byCharles T. Kowal
Discovery dateSeptember 11, 1974[1]
Avgdistance from the center of its orbital path11,160,000 km[2]
How long it takes to complete an orbit240.92 d (0.654 a)[2]
Average speed3.4 km/s
Angle above the reference plane
27.46° (to the ecliptic)
29.01° (to Jupiter's equator)[2]
What it orbitsJupiter
Size and other qualities
Average radius10 km
Surface area~1250 km²
Volume~4200 km³
Mass1.1×1016 kg
Average density2.6 g/cm³ (assumed)
Surface gravity~0.0073 m/s2 (0.001 g)
Escape velocity~0.012 km/s
How much light it reflects0.04 (assumed)
Avg. surface temp.~124 K
Seeming brightness
("apparent magnitude")
20.2 [3]

Leda or Jupiter XIII, is a prograde non-spherical moon of Jupiter. It was found by Charles T. Kowal at the Mount Palomar Observatory on September 14, 1974, after three nights' worth of photographic plates had been taken (September 11 through 13; Leda appears on all of them).[1][4] It was named after Leda, who was a lover of Zeus, the Greek equivalent of Jupiter (who came to her in the form of a swan). Kowal suggested the name and the IAU supported it in 1975.[5]

Leda belongs to the Himalia group, five moons orbiting between 11,000,000 and 13,000,000 km from Jupiter at an inclination of about 27.5°.[2] The orbital elements given here are as of January 2000, but they are changing a lot due to Solar and planetary perturbations.

References[change | change source]

  1. 1.0 1.1 Kowal, C. T.; Aksnes, K.; Marsden, B. G.; and Roemer, E. (1974). "Thirteenth satellite of Jupiter". Astronomical Journal 80: pp. 460–464. http://adsabs.harvard.edu//full/seri/AJ.../0080//0000460.000.html. 
  2. 2.0 2.1 2.2 2.3 Jacobson, R. A. (2000). "The orbits of outer Jovian satellites". Astronomical Journal 120: pp. 2679-2686. doi:10.1086/316817. 
  3. "Leda Statistics". Retrieved 2007-10-01.
  4. IAUC 2702: Probable New Satellite of Jupiter 1974 September 20 (discovery)
  5. Marsden, B. G. (7 October 1974). "Satellites of Jupiter". IAUC Circular 2846. http://cfa-www.harvard.edu/iauc/02800/02846.html. 

Other websites[change | change source]