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

    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

    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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