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Discovery
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| Discovered by | LINEAR |
| Discovery date | May 13, 1999 |
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Designations
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| Alternate name(s) | 1990 HD1 |
| Minor planet category |
near Earth, Mars crosser |
| Epoch December 1, 2005 (JD 2453705.5) | |
| Aphelion | 667.93 Gm (4.46 AU) |
| Perihelion | 142.03 Gm (0.95 AU) |
| Semi-major axis | 404.98 Gm (2.71 AU) |
| Eccentricity | .65 |
| Orbital period | 1626.91 d (4.45 a) |
| Average orbital speed | 16.01 km/s |
| Mean anomaly | 151.84° |
| Inclination | 13.83° |
| Longitude of ascending node | 133.90° |
| Argument of perihelion | 166.25° |
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Physical characteristics
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| Dimensions | 3.5 km |
| Rotation period | 136 h |
| Temperature | ~ K |
| Spectral type | X |
| Absolute magnitude (H) | 15.1 |
(53319) 1999 JM8 (also written (53319) 1999 JM8) is a near-Earth asteroid and Mars-crosser asteroid discovered by LINEAR. Radar imaging by Goldstone and Arecibo has revealed the asteroid to be 3.5 km in diameter. Like the asteroid 4179 Toutatis, its rotation speed is unusually slow and possibly chaotic. Its shape is bizarre, and is vaguely reminiscent of a roast chicken.
It passed closer than 30 Gm to the Earth five times in the last century (5 Gm in 1990), but its closest approach in the 21st century will be at 38.3 Gm, in 2075.
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