699 Hela
699 Hela is a Mars crossing asteroid. It was discovered on 5 June 1910 at Heidelberg by German astronomer Joseph Helffrich, and may have been named after Hel, the Norse ruler of the underworld. This asteroid is orbiting the Sun at a distance of  with a period of  and an eccentricity of 0.41. The orbital plane is inclined at an angle of 15.3° to the plane of the ecliptic. With an absolute magnitude of 11.7, the asteroid is about 12–27 km in diameter. It is classified as a stony Sk or Sq-type asteroid in the SMASS taxonomy. Photometry data used to produce light curves provide a rotation period of . The lightcurve inversion method was used to build a shape model with a rounded form and an equatorial bulge. References

External links 
 Lightcurve plot of 699 Hela, Palmer Divide Observatory, B. D. Warner (1999)
 Asteroid Lightcurve Database (LCDB), query form (info )
 Dictionary of Minor Planet Names, Google books
 Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
 Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
 
 

Mars-crossing asteroids
Hela
Hela
S-type asteroids (Tholen)
Sq-type asteroids (SMASS)
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