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.[4] This asteroid is orbiting the Sun at a distance of 2.61 AU with a period of 4.22 years and an eccentricity of 0.41. The orbital plane is inclined at an angle of 15.3° to the plane of the ecliptic.[2]

With an absolute magnitude of 11.7,[2] the asteroid is about 12–27 km in diameter.[3] It is classified as a stony Sk[5] or Sq-type[2] asteroid in the SMASS taxonomy. Photometry data used to produce light curves provide a rotation period of 3.39624±0.00006 h. The lightcurve inversion method was used to build a shape model with a rounded form and an equatorial bulge.[6]

References

  1. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  2. ^ a b c d e f g "JPL Small-Body Database Browser: 699 Hela (1910 KD)". Jet Propulsion Laboratory. Retrieved 7 May 2016.
  3. ^ a b "Absolute Magnitude (H)". NASA/JPL. Archived from the original on 2 March 2001. Retrieved 24 June 2014.
  4. ^ Schmadel, Lutz (2003), Dictionary of minor planet names, vol. 1, Springer, p. 68, ISBN 9783540002383.
  5. ^ Angeli, C. A.; Lazzaro, D. (August 2002), "Spectral properties of Mars-crossers and near-Earth objects. Results of the S3OS2 survey", Astronomy and Astrophysics, 391: 757–765, Bibcode:2002A&A...391..757A, doi:10.1051/0004-6361:20020834.
  6. ^ Alonso, E. Díez; et al. (April 2021), "Asteroids 4092 Tyr (Follow Up, Analysis, Preliminary Results) and 699 Hela (Spin-Shape Model)", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers, 48 (2): 136–139, Bibcode:2021MPBu...48..136A.
  • Lightcurve plot of 699 Hela, Palmer Divide Observatory, B. D. Warner (1999)
  • Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
  • 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
  • 699 Hela at AstDyS-2, Asteroids—Dynamic Site
    • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
  • 699 Hela at the JPL Small-Body Database Edit this at Wikidata
    • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters
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  • 698 Ernestina
  • 699 Hela
  • 700 Auravictrix
Authority control databases Edit this at Wikidata
  • JPL SBDB
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