1971 Hagihara
| Discovery [1][2] | |
|---|---|
| Discovered by |
Indiana University (Indiana Asteroid Program) |
| Discovery site | Goethe Link Obs. |
| Discovery date | 14 September 1955 |
| Designations | |
| MPC designation | 1971 Hagihara |
Named after |
Yusuke Hagihara (astronomer)[3] |
| 1955 RD1 · 1971 TZ2 | |
| main-belt | |
| Orbital characteristics [2] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 59.65 yr (21,787 days) |
| Aphelion | 3.2471 AU |
| Perihelion | 2.7358 AU |
| 2.9914 AU | |
| Eccentricity | 0.0855 |
| 5.17 yr (1,890 days) | |
| 217.90° | |
| 0° 11m 25.8s / day | |
| Inclination | 8.7007° |
| 300.13° | |
| 120.72° | |
| Physical characteristics | |
| Dimensions |
12.289±0.156[2][4] 15±7 km (converted)[5] |
| 0.135±0.028[2][4] | |
| 12.3[1][2] | |
|
| |
1971 Hagihara, provisional designation 1955 RD1, is an asteroid from the outer region of the asteroid belt, approximately 12 kilometers in diameter. It was discovered on 14 September 1955, by the Indiana Asteroid Program at the 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 has an eccentricity of 0.09 and an inclination of 9° with respect to the ecliptic.[2] The asteroid's observation arc begins with its discovery observation in September 1955.[1]
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 12.3 kilometers in diameter and its surface has an albedo of 0.135, which is neither typical for stony nor for carbonaceous bodies.[2][4] As of 2016, the asteroid's composition and spectral type, as well as its rotation period and shape remain unknown.[2]
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] Naming citation was published before November 1977 (M.P.C. 4419).[6]
References
- 1 2 3 4 "1971 Hagihara (1955 RD1)". Minor Planet Center. Retrieved 29 August 2016.
- 1 2 3 4 5 6 7 8 "JPL Small-Body Database Browser: 1971 Hagihara (1955 RD1)" (2015-05-09 last obs.). Jet Propulsion Laboratory. Retrieved 29 August 2016.
- 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1971) Hagihara. Springer Berlin Heidelberg. p. 159. ISBN 978-3-540-00238-3. Retrieved 29 August 2016.
- 1 2 3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096
. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 29 August 2016. - ↑ "Absolute Magnitude (H)". NASA/JPL. Retrieved 29 August 2016.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 29 August 2016.
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
