54 Alexandra
Encyclopedia : 5 : 54 : 54A : 54 Alexandra
| Orbital characteristics [1] | |
|---|---|
| Orbit type | Main belt |
| Semimajor axis | 2.713 AU |
| Perihelion distance | 2.180 AU |
| Aphelion distance | 3.247 AU |
| Orbital period | 4.47 years |
| Inclination | 11.81° |
| Eccentricity | 0.196 |
| Physical characteristics [1] | |
| Diameter | 165.8 km |
| Rotation period [3] | 7.024 hours |
| Spectral class | C |
| Abs. magnitude | 7.66 |
| Albedo [4] | 0.056 |
| History [2] | |
| Discoverer | H. Goldschmidt, 1858 |
54 Alexandra is a very large and dark main belt asteroid.
It was discovered by H. Goldschmidt on September 10, 1858 and named after the German explorer Alexander von Humboldt.
On May 17, 2005 this asteroid occulted a faint star (magnitude 8.5) and the event was observed and timed in a number of locations within the U.S. and Mexico. As a result a silhouette profile was produced, yielding a roughly oval cross-section with dimensions of 160 × 135 km (± 1 km).D.W. Dunham, "Upcoming Asteroid Occultations", Sky & Telescope, June, 2006, p. 63.
Aspects
| Stationary, then retrograde | Opposition | Minimum distance (AU) | Maximum brightness (mag) | Stationary, than prograde | Conjunction to sun | |
|---|---|---|---|---|---|---|
| 14. May 2005 | 23. June 2005 | 1,20760 AU | 10,3 mag | 4. August 2005 | 18. March 2006 | |
| 24. September 2006 | 18. November 2006 | 1,89756 AU | 11,8 mag | 1. January 2007 | 26. June 2007 | |
| 2. December 2007 | 27. January 2008 | 2,25760 AU | 12,1 mag | 23. March 2008 | 3. September 2008 | |
| 20. February 2009 | 14. April 2009 | 1,64961 AU | 11,4 mag | 29. May 2009 | 31. December 2009 | |
| 4. August 2010 | 27. September 2010 | 1,41997 AU | 10,8 mag | 7. November 2010 | 20. May 2011 | |
| 5. November 2011 | 29. December 2011 | 2,21794 AU | 12,2 mag | 20. February 2012 | 1. August 2012 | |
| 6. January 2013 | 3. March 2013 | 2,04005 AU | 11,9 mag | 26. April 2013 | 23. October 2013 | |
| 28. May 2014 | 8. July 2014 | 1,16974 AU | 10,1 mag | 20. August 2014 | 29. March 2015 | |
| 2. October 2015 | 25. November 2015 | 1,96222 AU | 11,9 mag | 10. January 2016 | 1. July 2016 | |
| 6. December 2016 | 31. January 2017 | 2,24336 AU | 12,0 mag | 29. March 2017 | 9. September 2017 | |
| 3. March 2018 | 24. April 2018 | 1,56970 AU | 11,2 mag | 6. June 2018 | 14. January 2019 | |
| 14. August 2019 | 8. October 2019 | 1,50630 AU | 11,0 mag | 17. November 2019 | 26. May 2020 | |
| 9. November 2020 | 2. January 2021 | 2,23974 AU | 12,2 mag | 26. February 2021 | 6. August 2021 |
Notes and references
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| The minor planets |
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| Vulcanoids | Near-Earth asteroids | Main belt | Jupiter Trojans | Centaurs | Damocloids | Comets | Trans-Neptunians (Kuiper belt · Scattered disc · Oort cloud) |
| For other objects and regions, see: , , asteroid moons and the Solar system For a complete listing, see: List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names. |
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