723 Hammonia

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723 Hammonia
Discovery
Discovered by J. Palisa
Discovery site Vienna
Discovery date 21 October 1911
Designations
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°
Earth MOID 1.84521 AU (276.039 Gm)
Jupiter MOID 2.06783 AU (309.343 Gm)
Jupiter Tisserand parameter 3.247
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 is 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]

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