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° 12 54.108 / day |
Inclination | 18.042° |
Longitude of ascending node | 124.388° |
Argument of perihelion | 88.376° |
Physical characteristics | |
Mean radius | 24.575±0.75 km |
Synodic rotation period | 25.230 h (1.0513 d) |
Geometric albedo | 0.1381±0.009 |
Absolute magnitude (H) | 9.31 |
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.
Description
This object is the namesake of the Watsonia family, an Asteroid family of approximately 100 asteroids that share similar spectral properties and orbital elements; hence they may have arisen from the same collisional event. All members have a relatively high orbital inclination.
References
- "watsonia". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
- Yeomans, Donald K., "729 Watsonia", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 5 May 2016.
- Pier Paolo Ricci (29 November 2012), Almanacco astronomico 2013 Astronomical almanac 2013, Lulu.com, pp. 322–, ISBN 978-1-291-21157-3
- Novaković, Bojan; et al. (November 2011), "Families among high-inclination asteroids", Icarus, vol. 216, no. 1, pp. 69–81, arXiv:1108.3740, Bibcode:2011Icar..216...69N, doi:10.1016/j.icarus.2011.08.016.
External links
- 729 Watsonia at AstDyS-2, Asteroids—Dynamic Site
- 729 Watsonia at the JPL Small-Body Database
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