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801 Helwerthia is a C-type asteroid orbiting in the Main belt near the Eunomia family. However, it is not a family member but an un-related interloper in the region because its composition is inconsistent with membership. Its diameter is about 33 km, its albedo around 0.038. An international team of astronomers observed this minor planet photometrically in 2012, determining a rotation period of 23.93±0.01 h with an amplitude of 0.15±0.03 in magnitude.

References

1. "801 Helwerthia (1915 WQ)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 6 May 2016.
2. "Supplemental IRAS Minor Planet Survey". Archived from the original on 23 June 2006.
3. Pilcher, Frederick; et al. (October 2012), "Rotation Period Determination for 801 Helwerthia", The Minor Planet Bulletin, 39 (4): 222–225, Bibcode:2012MPBu...39..222P

External links

• 801 Helwerthia at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 801 Helwerthia at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

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