.png) 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 | |
| MPC designation | (82) Alkmene |
| Pronunciation | /ælkˈmiːniː/ |
| Named after | Alcmene |
| Minor planet category | Main belt |
| Adjectives | Alkmenean /ælkˈmiːniən/ |
| Orbital characteristics | |
| Epoch 9 December 2014 (JD 2457000.5) | |
| Aphelion | 3.3701 AU |
| Perihelion | 2.1609 AU |
| Semi-major axis | 2.7655 AU |
| Eccentricity | 0.2186 |
| Orbital period (sidereal) | 4.60 yr |
| Average orbital speed | 17.70 km/s |
| Mean anomaly | 192.56° |
| Inclination | 2.8286° |
| Longitude of ascending node | 25.507° |
| Argument of perihelion | 111.27° |
| Physical characteristics | |
| Dimensions | 61±1.5 km (IRAS) |
| Mass | 2.4×10 kg (assumed) |
| Synodic rotation period | 12.999 h |
| Geometric albedo | 0.208 |
| Spectral type | S |
| Absolute magnitude (H) | 8.40 |
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. A satellite has been suggested based on 1985 lightcurve data.
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. 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.
- ^ "JPL Small-Body Database Browser: 82 Alkmene". Retrieved 9 September 2014.
- "Other reports of asteroid/TNO companions".
- Interactive GoogleMap of Shadow Path Archived 2014-09-09 at archive.today
- "(82) Alkmene / HIP 99229 event on 2014 Sep 18, 06:41 UT". Archived from the original on 11 September 2014.
External links
- 82 Alkmene at AstDyS-2, Asteroids—Dynamic Site
- 82 Alkmene at the JPL Small-Body Database
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