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723 Hammonia is a minor planet orbiting the Sun. It was discovered in 1911 and is named after the city of Hamburg. Although the name alludes to Hamburg it was discovered in Vienna.

The asteroid was discovered by the noted and prolific astronomer Johann Palisa. He worked from Pola early in his career and later from Vienna observatories. The same night he discovered Hammonia, he also discovered 724 Hapag and 725 Amanda. He discovered dozens and dozens of asteroids between 1874 and 1923, ranging from 136 Austria to 1073 Gellivara.

As seen from a certain area on Earth, 723 Hammonia occulted the star 3UC149-190572 on June 3, 2013.

In 2014 it was noted to have a high-albedo and amorphous Mg pyroxenes was suggested as a possible reason for this.

See also

• 449 Hamburga (another asteroid named after Hamburg)
• Vienna Observatory

References

1. "723 Hammonia (1911 NB)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 5 May 2016.
2. ^ "(723) Hammonia". Dictionary of Minor Planet Names. Springer. 2007. pp. 69–70. doi:10.1007/978-3-540-29925-7_724. ISBN 978-3-540-00238-3.
3. ^ "Johann Palisa, the most successful visual discoverer of asteroids" (PDF). Archived from the original (PDF) on 28 September 2007. Retrieved 31 August 2015.
4. OCULTACION 3UC149-190572 POR 723 HAMMONIA 2013-06-03
5. Kasuga, T.; Usui, F.; Ootsubo, T.; Hasegawa, S.; Kuroda, D.; Shirahata, M.; Okamura, N. (2014). "High-albedo C-complex outer-belt asteroids: The near-infrared spectra". Asteroids: 254. Bibcode:2014acm..conf..254K.

External links

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

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• Discoveries by Johann Palisa
• Named minor planets
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• Astronomical objects discovered in 1911
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