101 Helena

Source: Wikipedia, the free encyclopedia.
Not to be confused with Helene (moon).

101 Helena
Synodic rotation period
23.080 h (0.9617 d)[2]
0.1898±0.008[2]
Temperature~173 K
S[3]
8.33

Helena (

main-belt asteroid. It was discovered by Canadian-American astronomer J. C. Watson on August 15, 1868,[4] and was named after Helen of Troy in Greek mythology
.

This object is orbiting the

Tholen system,[3][5] suggesting a predominantly silicate composition. 101 Helena is spinning on its axis with a period of 23 hours.[2]

References

  1. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  2. ^
    NASA Jet Propulsion Laboratory, archived from the original
    on 24 September 2014, retrieved 12 May 2016.
  3. ^
    doi:10.1016/j.icarus.2009.02.005, archived from the original
    (PDF) on 17 March 2014, retrieved 22 March 2013. See appendix A.
  4. ^ "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
  5. doi:10.1016/j.icarus.2006.08.018
    .

External links
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