1971 Hagihara
| Discovery [1][2] | |
|---|---|
| Discovered by | Indiana Asteroid Program |
| Discovery site | Goethe Link Obs. |
| Discovery date | 14 September 1955 |
| Designations | |
| MPC designation | 1971 Hagihara |
Named after | Yusuke Hagihara[3] |
| 1955 RD1 · 1971 TZ2 | |
| main-belt | |
| Orbital characteristics [2] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 59.65 yr (21787 days) |
| Aphelion | 3.2470 AU (485.74 Gm) |
| Perihelion | 2.7352 AU (409.18 Gm) |
| 2.9911 AU (447.46 Gm) | |
| Eccentricity | 0.085546 |
| 5.17 yr (1889.5 d) | |
| 179.72° | |
| 0° 11m 25.908s / day | |
| Inclination | 8.7009° |
| 300.13° | |
| 120.79° | |
| Earth MOID | 1.76034 AU (263.343 Gm) |
| Jupiter MOID | 2.02098 AU (302.334 Gm) |
| Jupiter Tisserand parameter | 3.233 |
| Physical characteristics | |
| Dimensions | 15±7 km (converted)[4] |
| 12.3 | |
|
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1971 Hagihara, provisional designation 1955 RD1, is an asteroid from the outer region of the asteroid belt, roughly 15 kilometers in diameter. It was discovered on September 14, 1955 by the Indiana Asteroid Program at Goethe Link Observatory near Brooklyn, Indiana, United States.[1]
The asteroid orbits the Sun at a distance of 2.7–3.2 AU once every 5 years and 2 months (1,890 days). Its orbit is tilted by 9 degrees to the plane of the ecliptic and shows an eccentricity of 0.09. Little is known about the asteroids effective size, composition, albedo and rotation, despite having a well-observed orbit with the lowest possible uncertainty (i.e. a condition code of 0) and an observation arc that spans over a period of 60 years.[2]
Based on its absolute magnitude of 12.3, the body's diameter could be anywhere between 8 and 22 kilometers, assuming an albedo in the range of 0.05 to 0.25.[4] Since most asteroids in the outer main-belt are of a carbonaceous rather than of a silicaceous composition, with low albedos typically around 0.06, the asteroid's diameter might be on the upper end of NASA's published conversion table, as the lower the reflectivity (albedo), the larger the body's diameter for a given absolute brightness (magnitude).[4]
The asteroid was named in honour of Yusuke Hagihara (1897–1979) on the occasion of his 81st birthday. He was professor of astronomy at the University of Tokyo and director of the Tokyo Observatory. He also served as vice-president of the International Astronomical Union and was the president of its Commission VII. Hagihara is best known for the discussion of stability problems in celestial mechanics and his theory of libratory motions, as well as for important contributions to the study of the velocity distribution of free electrons in planetary nebulae, and his important five-volume treatise on celestial mechanics.[3]
References
- 1 2 "1971 Hagihara (1955 RD1)". Minor Planet Center. Retrieved October 2015.
- 1 2 3 "JPL Small-Body Database Browser: 1971 Hagihara (1955 RD1)" (2015-05-09 last obs.). Jet Propulsion Laboratory. Retrieved 18 April 2016.
- 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1971) Hagihara. Springer Berlin Heidelberg. p. 159. ISBN 978-3-540-29925-7. Retrieved October 2015.
- 1 2 3 "Absolute Magnitude (H)". NASA/JPL. Retrieved December 2015.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 1971 Hagihara at the JPL Small-Body Database
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