723 Hammonia
| Discovery | |
|---|---|
| Discovered by | J. Palisa |
| Discovery site | Vienna Observatory |
| Discovery date | 21 October 1911 |
| Designations | |
| (723) Hammonia | |
| Pronunciation | /hæˈmoʊniə/ |
Named after | Hamburg |
| 1911 NB | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 113.17 yr (41337 d) |
| Aphelion | 3.1540 AU (471.83 Gm) |
| Perihelion | 2.8324 AU (423.72 Gm) |
| 2.9932 AU (447.78 Gm) | |
| Eccentricity | 0.053719 |
| 5.18 yr (1891.5 d) | |
| 71.167° | |
| 0° 11m 25.188s / day | |
| Inclination | 4.9954° |
| 163.351° | |
| 246.398° | |
| Physical characteristics | |
| 17.84±0.7 km | |
| 5.436 h (0.2265 d) | |
| 0.1829±0.015 | |
| 10.0 | |
723 Hammonia is a minor planet orbiting the Sun. It was discovered in 1911 and is named after the city of Hamburg.[2] Although the name alludes to Hamburg it was discovered in Vienna.[2]
The asteroid was discovered by the noted and prolific astronomer Johann Palisa.[3] He worked from Pola early in his career and later from Vienna observatories.[3] The same night he discovered Hammonia, he also discovered 724 Hapag and 725 Amanda.[3] He discovered dozens and dozens of asteroids between 1874 and 1923, ranging from 136 Austria to 1073 Gellivara.[3]
As seen from a certain area on Earth, 723 Hammonia occulted the star 3UC149-190572 on June 3, 2013.[4]
In 2014 it was noted to have a high-albedo and amorphous Mg pyroxenes was suggested as a possible reason for this.[5]
See also
[edit]- 449 Hamburga (another asteroid named after Hamburg)
- Vienna Observatory
References
[edit]- ^ "723 Hammonia (1911 NB)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 5 May 2016.
- ^ a b "(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.
- ^ a b c d "Johann Palisa, the most successful visual discoverer of asteroids" (PDF). Archived from the original (PDF) on 28 September 2007. Retrieved 31 August 2015.
- ^ OCULTACION 3UC149-190572 POR 723 HAMMONIA 2013-06-03
- ^ 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
[edit]- 723 Hammonia at AstDyS-2, Asteroids—Dynamic Site
- 723 Hammonia at the JPL Small-Body Database
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