82 Alkmene
![]() A three-dimensional model of 82 Alkmene based on its light curve. | |
Discovery | |
---|---|
Discovered by | Karl Theodor Robert Luther |
Discovery date | 27 November 1864 |
Designations | |
(82) Alkmene | |
Pronunciation | /ælkˈmiːniː/[1] |
Named after | Alcmene |
Main belt | |
Adjectives | Alkmenean /ælkˈmiːniən/[2] |
Orbital characteristics | |
Epoch 9 December 2014 (JD 2457000.5) | |
Aphelion | 3.3701 AU |
Perihelion | 2.1609 AU |
2.7655 AU | |
Eccentricity | 0.2186 |
4.60 yr | |
Average orbital speed | 17.70 km/s |
192.56° | |
Inclination | 2.8286° |
25.507° | |
111.27° | |
Physical characteristics | |
Dimensions | 61±1.5 km (IRAS)[3] |
Mass | 2.4×1017 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
- ^ 'Alcmene, Alkmene' in The Century Dictionary and Cyclopedia (1895)
- ^ Mairéad McAuley (2015), Reproducing Rome, p. 126; stress determined by verse in George Chapman, Gentleman Usher, Thomas Parrott 1907 ed., p. 220.
- ^ a b c d e f "JPL Small-Body Database Browser: 82 Alkmene". Retrieved 9 September 2014.
- ^ http://www.johnstonsarchive.net/astro/asteroidmoonsq.html
- ^ Interactive GoogleMap of Shadow Path Archived 2014-09-09 at archive.today
- ^ http://www.asteroidoccultation.com/2014_09/0918_82_32999.htm
External links
- 82 Alkmene at AstDyS-2, Asteroids—Dynamic Site
- 82 Alkmene at the JPL Small-Body Database