1578 Kirkwood
1578 Kirkwood, provisional designation 1951 AT, is a Hilda asteroid from the outermost regions of the asteroid belt, approximately 52 kilometers in diameter. It was discovered on 10 January 1951, by astronomers of the Indiana Asteroid Program at Goethe Link Observatory in Indiana, United States. The asteroid was named after American astronomer Daniel Kirkwood.
Shape model of Kirkwood from its lightcurve | |
| Discovery | |
|---|---|
| Discovered by | Indiana University (Indiana Asteroid Program) |
| Discovery site | Goethe Link Obs. |
| Discovery date | 10 January 1951 |
| Designations | |
MPC designation | (1578) Kirkwood |
Named after | Daniel Kirkwood (American astronomer) |
Alternative designations | 1951 AT · 1944 DF 1949 TF · 1952 FK |
Minor planet category | main-belt · (outer) Hilda |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 73.37 yr (26,797 days) |
| Aphelion | 4.8617 AU |
| Perihelion | 2.9855 AU |
Semi-major axis | 3.9236 AU |
| Eccentricity | 0.2391 |
Orbital period (sidereal) | 7.77 yr (2,839 days) |
Mean anomaly | 195.23° |
Mean motion | 0° 7m 36.48s / day |
| Inclination | 0.8085° |
Longitude of ascending node | 74.002° |
| 1.7729° | |
| Jupiter MOID | 0.4366 AU |
| Physical characteristics | |
| Dimensions | 47.077±0.315 km 51.88±1.8 km 57.14±1.27 km |
Synodic rotation period | 12.518±0.002 h 17.9±0.1 h |
| 0.044±0.002 0.0517±0.004 0.063±0.005 | |
| Tholen = D · D B–V = 0.788 U–B = 0.276 | |
| 10.26 · 10.41±0.50 | |
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