9000 Hal

This article is about the real-life asteroid. For the fictional computer in 2001: A Space Odyssey, see HAL 9000.

9000 Hal
Discovery [1]
Discovered byE. Bowell
Discovery siteAnderson Mesa Stn.
Discovery date3 May 1981
Designations
(9000) Hal
Pronunciation/ˈhæl/
Named after
HAL 9000 [1]
(Fictional supercomputer)
1981 JO · 1975 VH3
1981 JJ3 · 1995 US3
main-belt [1][2] · (inner)
background [3] · Flora [4]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc41.49 yr (15,156 d)
Aphelion2.6955 AU
Perihelion1.7648 AU
2.2301 AU
Eccentricity0.2087
3.33 yr (1,216 d)
328.38°
0° 17m 45.24s / day
Inclination6.2618°
226.61°
79.871°
Physical characteristics
3.61±0.78 km[5]
4.11 km (calculated)[4]
4.134±0.935 km[6][7]
22.68±0.02 h (poor)[8]
908 h[9]
0.24 (assumed)[4]
0.26±0.13[5]
0.375±0.184[6][7]
S (assumed)[4]
13.6[7]
14.0[2]
14.1[4]
14.35±0.66[10]
14.42[5]

9000 Hal, provisional designation 1981 JO, is a stony background asteroid and slow rotator from the inner regions of the asteroid belt, approximately 4 kilometers (2.5 miles) in diameter. It was discovered on 3 May 1981, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station near Flagstaff, Arizona, in the United States.[1] The likely elongated S-type asteroid has an exceptionally long rotation period of 908 hours.[4] It was named after the homicidal supercomputer HAL 9000, featured in the 1968 film 2001: A Space Odyssey.[1]

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