Astronomy: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) |
| |{{{apsis}}}|helion}} | 3.1540 astronomical unit|AU (471.83 Gm) |
| |{{{apsis}}}|helion}} | 2.8324 AU (423.72 Gm) |
| 2.9932 AU (447.78 Gm) | |
| Eccentricity | 0.053719 |
| Orbital period | 5.18 yr (1891.5 d) |
| Mean anomaly | 71.167° |
| Mean motion | 0° 11m 25.188s / day |
| Inclination | 4.9954° |
| Longitude of ascending node | 163.351° |
| 246.398° | |
| Physical characteristics | |
| Mean radius | 17.84±0.7 km |
| Rotation period | 5.436 h (0.2265 d) |
| Geometric albedo | 0.1829±0.015 |
| Absolute magnitude (H) | 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.[3] (Vienna is the capital of Austria)
The asteroid was discovered by the noted and prolific astronomer Johann Palisa.[4] He worked from Pola early in his career and later from Vienna observatories.[5] The same night he discovered Hammonia, he also discovered 724 Hapag and 725 Amanda.[6] He discovered dozens and dozens of asteroids between 1874 and 1923, ranging from 136 Austria to 1073 Gellivara.[7]
As seen from a certain area on Earth, 723 Hammonia occulted the star 3UC149-190572 on June 3, 2013.[8]
In 2014 it was noted to have a high-albedo and amorphous Mg pyroxenes was suggested as a possible reason for this.[9]
See also
- 449 Hamburga (another asteroid named after Hamburg)
- Vienna Observatory
References
- ↑ "723 Hammonia (1911 NB)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=723;cad=1.
- ↑ (723) Hammonia
- ↑ (723) Hammonia
- ↑ "Johann Palisa, the most successful visual discoverer of asteroids". http://www.astrometrica.at/papers/palisa.pdf.
- ↑ "Johann Palisa, the most successful visual discoverer of asteroids". http://www.astrometrica.at/papers/palisa.pdf.
- ↑ "Johann Palisa, the most successful visual discoverer of asteroids". http://www.astrometrica.at/papers/palisa.pdf.
- ↑ "Johann Palisa, the most successful visual discoverer of asteroids". http://www.astrometrica.at/papers/palisa.pdf.
- ↑ OCULTACION 3UC149-190572 POR 723 HAMMONIA 2013-06-03
- ↑ High-albedo C-complex outer-belt asteroids: The near-infrared spectra
External links
- 723 Hammonia at AstDyS-2, Asteroids—Dynamic Site
- 723 Hammonia at the JPL Small-Body Database
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