723 Hammonia

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)

723 Hammonia
Discovery
Discovered byJ. Palisa
Discovery siteVienna Observatory
Discovery date21 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 arc113.17 yr (41337 d)
Aphelion3.1540 AU (471.83 Gm)
Perihelion2.8324 AU (423.72 Gm)
2.9932 AU (447.78 Gm)
Eccentricity0.053719
5.18 yr (1891.5 d)
71.167°
0° 11m 25.188s / day
Inclination4.9954°
163.351°
246.398°
Physical characteristics
Mean radius
17.84±0.7 km
5.436 h (0.2265 d)
0.1829±0.015
10.0

    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

    References
    1. "723 Hammonia (1911 NB)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 5 May 2016.
    2. (723) Hammonia
    3. (723) Hammonia
    4. "Johann Palisa, the most successful visual discoverer of asteroids" (PDF). Archived from the original (PDF) on 28 September 2007. Retrieved 31 August 2015.
    5. "Johann Palisa, the most successful visual discoverer of asteroids" (PDF). Archived from the original (PDF) on 28 September 2007. Retrieved 31 August 2015.
    6. "Johann Palisa, the most successful visual discoverer of asteroids" (PDF). Archived from the original (PDF) on 28 September 2007. Retrieved 31 August 2015.
    7. "Johann Palisa, the most successful visual discoverer of asteroids" (PDF). Archived from the original (PDF) on 28 September 2007. Retrieved 31 August 2015.
    8. OCULTACION 3UC149-190572 POR 723 HAMMONIA 2013-06-03
    9. High-albedo C-complex outer-belt asteroids: The near-infrared spectra


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