82 Alkmene

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82 Alkmene
82Alkmene (Lightcurve Inversion).png
A three-dimensional model of 82 Alkmene based on its light curve.
Discovery
Discovered by Karl Theodor Robert Luther
Discovery date November 27, 1864
Designations
Named after
Alcmene
 
Main belt
Orbital characteristics
Epoch 2014-Dec-09
(JD 2457000.5)
Aphelion 3.3701 AU
Perihelion 2.1609 AU
2.7655 AU
Eccentricity 0.2186
4.60 yr
17.70 km/s
192.56°
Inclination 2.8286°
25.507°
111.27°
Physical characteristics
Dimensions 61 ± 1.5 km (IRAS)[1]
Mass 2.4×1017 kg (assumed)
Mean density
? g/cm³
0.0170 m/s² (assumed)
0.0322 km/s (assumed)
12.999 h[1]
Albedo 0.208[1]
Temperature ~168 K
Spectral type
S[1]
8.40[1]

82 Alkmene (/ælkˈmn/ alk-MEE-nee) is a main-belt asteroid. Alkmene was discovered by R. Luther on November 27, 1864, and named after Alcmene, the mother of Herakles in Greek mythology. Based on IRAS data, Alkmene is estimated to be about 61 km in diameter.[1] A satellite has been suggested based on 1985 lightcurve data.[2]

Asteroid Alkmene occulted the apparent magnitude 7.5 star HIP 99229 in the constellation of Capricornus on 18 September 2014 around 06:41 UT (17 September 23:41 PDT) and was centered on Sacramento, CA.[3][4] Alkmene projected an eclipse shadow that moves at about 2 miles/second. Asteroid occultations allow for accurate 2-dimensional mapping of an asteroids silhouette when observed by multiple telescopes separated by about 10km.

References[edit]