82 Alkmene
A three-dimensional model of 82 Alkmene based on its light curve.
Discovery
Discovered byKarl Theodor Robert Luther
Discovery date27 November 1864
Designations
(82) Alkmene
Pronunciation/ælkˈmiːniː/[1]
Named after
Alcmene
Main belt
AdjectivesAlkmenean /ælkˈmiːniən/[2]
Orbital characteristics
Epoch 9 December 2014 (JD 2457000.5)
Aphelion3.3701 AU
Perihelion2.1609 AU
2.7655 AU
Eccentricity0.2186
4.60 yr
17.70 km/s
192.56°
Inclination2.8286°
25.507°
111.27°
Physical characteristics
Dimensions61±1.5 km (IRAS)[3]
Mass2.4×1017 kg (assumed)
12.999 h[3]
0.208[3]
S[3]
8.40[3]

    Alkmene (minor planet designation: 82 Alkmene) is a main-belt asteroid. Alkmene was discovered by R. Luther on 7 November 1864 and named after Alcmene, the mother of Herakles in Greek mythology. Based on IRAS data, Alkmene is estimated to be about 61 kilometres (38 mi) in diameter.[3] A satellite has been suggested based on 1985 lightcurve data.[4]

    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.[5][6] Alkmene projected an eclipse shadow that moves at about 3.2 km/s (2 mi/s). Asteroid occultations allow for accurate 2-dimensional mapping of an asteroids silhouette when observed by multiple telescopes separated by about 10 km (6.2 mi).

    References

    1. ↑ 'Alcmene, Alkmene' in The Century Dictionary and Cyclopedia (1895)
    2. ↑ Mairéad McAuley (2015), Reproducing Rome, p. 126; stress determined by verse in George Chapman, Gentleman Usher, Thomas Parrott 1907 ed., p. 220.
    3. 1 2 3 4 5 6 "JPL Small-Body Database Browser: 82 Alkmene". Retrieved 9 September 2014.
    4. ↑ "Other reports of asteroid/TNO companions".
    5. ↑ Interactive GoogleMap of Shadow Path Archived 2014-09-09 at archive.today
    6. ↑ "(82) Alkmene / HIP 99229 event on 2014 Sep 18, 06:41 UT". Archived from the original on 11 September 2014.


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