452 Hamiltonia

Hamiltonia (minor planet designation: 452 Hamiltonia) is an asteroid. It was discovered by James Edward Keeler on December 6, 1899, but was then lost until 1987. Its provisional name was 1899 FD. The asteroid is named for Mount Hamilton, the site of Lick Observatory where Keeler was working when he discovered the asteroid. It was the last asteroid discovery of the 19th century.

452 Hamiltonia
Discovery
Discovered byJames Edward Keeler
Discovery siteMount Hamilton
Discovery date6 December 1899
Designations
(452) Hamiltonia
Pronunciation/hæmɪlˈtoʊniə/
Named after
Mount Hamilton
1899 FD
main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc116.35 yr (42497 d)
Aphelion2.8911284 AU (432.50665 Gm)
Perihelion2.8064929 AU (419.84536 Gm)
2.8488107 AU (426.17601 Gm)
Eccentricity0.0148545
4.81 yr (1756.3 d)
9.4952678°
0° 12m 17.923s / day
Inclination3.223518°
92.53125°
69.71870°
Physical characteristics
2.8813 h (0.12005 d)
11.9

    L. K. Kristensen at Aarhus University rediscovered 452 Hamiltonia along with 1537 Transylvania along with numerous other small objects in 1981.[2] These rediscoveries left only nine numbered minor planets unobserved since their discoveries: 330 Adalberta (which never existed in the first place), 473 Nolli, 719 Albert, 724 Hapag, 843 Nicolaia, 878 Mildred, 1009 Sirene, 1026 Ingrid, and 1179 Mally.[2] However, by the mid-1980s the only remaining lost asteroids of this group were 719 Albert (rediscovered in 2000), 724 Hapag (rediscovered in 1988), and 878 Mildred (rediscovered in 1991).[3]

    References
    1. "452 Hamiltonia (1899 FD)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 6 May 2016.
    2. (1537) Transylvania and (452) Hamiltonia Kristensen, L. K.; Gibson, J.; Shao, C.-Y.; Bowell, E.; Marsden, B. G. IAU Circ., 3595, 1 (1981). Edited by Marsden, B. G.
    3. Cowen, Ron (20 May 2000). "Astronomers Rediscover Long-Lost Asteroid". 157 (21). Science News. Archived from the original on 28 December 2012.

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