729 Watsonia
729 Watsonia is a rare-type asteroid and namesake of the Watsonia family from the central region of the asteroid belt. It was named after the Canadian-American astronomer James C. Watson. Watsonia occulted the star 54 Leonis (HIP 53417, a 4.3 Magnitude Star) on 2013 Mar 03 at 01:48.
| Discovery | |
|---|---|
| Discovered by | Joel Hastings Metcalf |
| Discovery site | Winchester, Massachusetts |
| Discovery date | 9 February 1912 |
| Designations | |
MPC designation | (729) Watsonia |
| Pronunciation | /wɒtˈsoʊniə/ |
Alternative designations | 1912 OD |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 98.79 yr (36082 d) |
| Aphelion | 3.0270 AU (452.83 Gm) |
| Perihelion | 2.4917 AU (372.75 Gm) |
Semi-major axis | 2.7594 AU (412.80 Gm) |
| Eccentricity | 0.096988 |
Orbital period (sidereal) | 4.58 yr (1674.2 d) |
Mean anomaly | 223.02° |
Mean motion | 0° 12m 54.108s / day |
| Inclination | 18.042° |
Longitude of ascending node | 124.388° |
| 88.376° | |
| Physical characteristics | |
Mean radius | 24.575±0.75 km |
Synodic rotation period | 25.230 h (1.0513 d) |
| 0.1381±0.009 | |
| 9.31 | |
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