Astronomy:82 Alkmene
.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 | |
| (82) Alkmene | |
| Pronunciation | /ælkˈmiːniː/[1] |
| Named after | Alcmene |
| Minor planet category | Main belt |
| Adjectives | Alkmenean /ælkˈmiːniən/[2] |
| Orbital characteristics | |
| Epoch 9 December 2014 (JD 2457000.5) | |
| |{{{apsis}}}|helion}} | 3.3701 AU |
| |{{{apsis}}}|helion}} | 2.1609 AU |
| 2.7655 AU | |
| Eccentricity | 0.2186 |
| Orbital period | 4.60 yr |
| Average Orbital speed | 17.70 km/s |
| Mean anomaly | 192.56° |
| Inclination | 2.8286° |
| Longitude of ascending node | 25.507° |
| 111.27° | |
| Physical characteristics | |
| Dimensions | 61±1.5 km (IRAS)[3] |
| Mass | 2.4×1017 kg (assumed) |
| Rotation period | 12.999 h[3] |
| Geometric albedo | 0.208[3] |
| S[3] | |
| Absolute magnitude (H) | 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.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "JPL Small-Body Database Browser: 82 Alkmene". https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=82.
- ↑ "Other reports of asteroid/TNO companions". http://www.johnstonsarchive.net/astro/asteroidmoonsq.html.
- ↑ Interactive GoogleMap of Shadow Path
- ↑ "(82) Alkmene / HIP 99229 event on 2014 Sep 18, 06:41 UT". 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
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