801 Helwerthia
Main belt Asteroid
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.[2] 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.[3]
References
- ^ "801 Helwerthia (1915 WQ)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 6 May 2016.
- ^ "Supplemental IRAS Minor Planet Survey". Archived from the original on 23 June 2006.
- ^ 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 diagram · Orbital elements · Physical parameters
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- 800 Kressmannia
- 801 Helwerthia
- 802 Epyaxa
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