31 Euphrosyne
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| Orbital characteristics 1 | |
|---|---|
| Orbit type | Main belt |
| Semimajor axis | 3.149 AU |
| Perihelion distance | 2.436 AU |
| Aphelion distance | 3.862 AU |
| Orbital period | 5.59 years |
| Inclination | 26.32° |
| Eccentricity | 0.226 |
| Physical characteristics 1 | |
| Diameter | 255.9 km |
| Rotation period 3 | 5.531 hours |
| Abs. magnitude | 6.74 |
| History 2 | |
| Discoverer | J. Ferguson, 1854 |
31 Euphrosyne (ew-fros'-i-nee or ew-froz'-i-nee) is one of the largest main belt asteroids.
Euphrosyne was discovered by James Ferguson on September 1, 1854. It was the first asteroid found from North America. It is named after Euphrosyne, one of the Charites in Greek mythology.
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Aspects
| Stationary, than retrograde | Opposition | Distance at opposition | Brightness at opposition | Stationary, than prograde | Conjunction to Sun |
|---|---|---|---|---|---|
| 2. June 2004 | 19. July 2004 | 2,89105 AE | 12,5 mag | 20. September 2004 | 15. February 2005 |
| 5. August 2005 | 26. September 2005 | 2,04616 AE | 11,2 mag | 29. November 2005 | 9. May 2006 |
| 24. December 2006 | 24. January 2007 | 1,66730 AE | 10,7 mag | 18. March 2007 | 27. September 2007 |
| 24. February 2008 | 26. April 2008 | 2,40300 AE | 11,5 mag | 25. June 2008 | 23. November 2008 |
| 20. April 2009 | 17. June 2009 | 2,94398 AE | 12,6 mag | 13. August 2009 | 12. January 2010 |
| 30. June 2010 | 14. August 2010 | 2,64946 AE | 12,2 mag | 21. October 2010 | 16. March 2011 |
| 9. September 2011 | 3. November 2011 | 1,62924 AE | 10,2 mag | 25. December 2011 | 11. July 2012 |
| 26. January 2013 | 15. March 2013 | 1,92204 AE | 11,0 mag | 18. May 2013 | 25. October 2013 |
| 16. March 2014 | 18. May 2014 | 2,70365 AE | 12,1 mag | 15. July 2014 | 14. December 2014 |
| 21. May 2015 | 10. July 2015 | 2,94097 AE | 12,6 mag | 9. September 2015 | 5. February 2016 |
| 25. July 2016 | 12. September 2016 | 2,24648 AE | 11,6 mag | 18. November 2016 | 20. April 2017 |
| 20. November 2017 | 26. December 2017 | 1,58396 AE | 10,5 mag | 6. February 2018 | 10. September 2018 |
| 16. February 2019 | 16. April 2019 | 2,25800 AE | 11,3 mag | 17. June 2019 | 16. November 2019 |
| 8. April 2020 | 7. June 2020 | 2,90034 AE | 12,5 mag | 3. August 2020 | 3. January 2021 |
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es:(31) Eufrosina fr:(31) Euphrosyne it:31 Euphrosyne ja:エウフロシネ (小惑星) sk:31 Euphrosyne