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Discovery
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|---|---|
| Discovered by | Cornelis Johannes van Houten, Ingrid van Houten-Groeneveld and Tom Gehrels |
| Discovery site | Palomar Observatory |
| Discovery date | September 24, 1960 |
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Designations
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| MPC designation | 8591 |
| Named after | Great Grey Shrike |
| Alternate name(s) | 6543 P-L |
| Epoch May 14, 2008 | |
| Ap | 3.7468238 |
| Peri | 2.5811256 |
| Eccentricity | 0.1842142 |
| Orbital period | 2055.6441164 |
| Mean anomaly | 170.63330 |
| Inclination | 2.08326 |
| Longitude of ascending node | 82.11134 |
| Argument of peri | 251.44133 |
|
Physical characteristics
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| Absolute magnitude (H) | 12.8 |
8591 Excubitor (6543 P-L) is a main-belt asteroid discovered on September 24, 1960 by Cornelis Johannes van Houten, Ingrid van Houten-Groeneveld and Tom Gehrels at Palomar Observatory.