4672 Takuboku, provisional designation 1988 HB, is a background asteroid from the outer regions of the asteroid belt, approximately 35 kilometers (22 miles) in diameter. It was discovered on 17 April 1988, by Japanese astronomers Seiji Ueda and Hiroshi Kaneda at the Kushiro Observatory on Hokkaido, Japan. The asteroid was named after the Japanese poet Takuboku Ishikawa.[1] In 2005, measurement of the body's occultation ellipse also gave 35.0 × 35.0 kilometers.[4]
| Discovery [1] | |
|---|---|
| Discovered by | S. Ueda H. Kaneda |
| Discovery site | Kushiro Obs. |
| Discovery date | 17 April 1988 |
| Designations | |
| (4672) Takuboku | |
Named after | Takuboku Ishikawa [1] (Japanese poet) |
| 1988 HB · 1971 HT 1979 WS7 · 1981 AN3 | |
| main-belt [1][2] · (outer) background [3] | |
| Orbital characteristics [2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 46.11 yr (16,841 d) |
| Aphelion | 3.3411 AU |
| Perihelion | 3.0318 AU |
| 3.1864 AU | |
| Eccentricity | 0.0485 |
| 5.69 yr (2,078 d) | |
| 45.665° | |
| 0° 10m 23.88s / day | |
| Inclination | 15.530° |
| 91.663° | |
| 175.66° | |
| Physical characteristics | |
| Dimensions | 35.0 km × 35.0 km (occultation)[4] |
Mean diameter | 28.115±0.258 km[5] 35.59±1.9[6] |
| 0.0609±0.007[6] 0.108±0.018[5] | |
| 10.90[6] 11.4[2] | |
Orbit and classification edit
Takuboku is a non-family asteroid from the main belt's background population.[3] It orbits the Sun in the outer main-belt at a distance of 3.0–3.3 AU once every 5 years and 8 months (2,078 days; semi-major axis of 3.19 AU). Its orbit has an eccentricity of 0.05 and an inclination of 16° with respect to the ecliptic.[2]
The body's observation arc begins with its first observation as 1971 HT at Crimea–Nauchnij in April 1971, or 17 years prior to its official discovery observation at Kushiro.[1]
Physical characteristics edit
Takuboku has an absolute magnitude of between 10.90 and 11.4. As of 2018, no rotational lightcurve of Takuboku has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[2]
Diameter and albedo edit
According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer and the Infrared Astronomical Satellite IRAS, Takuboku measures 28.115 and 35.59 kilometers in diameter and its surface has an albedo of 0.108 and 0.0609, respectively.[5][6]
Occultation edit
On 13 June 2005, Takuboku occulted 9.3 magnitude star TYC 0312-00789-1, causing a predicted magnitude drop 6.8 during 4.3 seconds. The occultation was visible over the southern island of New Zealand only. Measurement of the asteroid's occultation dimensions 35.0 ×35.0 for its major and minor best-fit ellipse (the fit's quality code is 1).[4][a]
Naming edit
This minor planet was named after Japanese poet Takuboku Ishikawa (1886–1912) who lived in Japan's late Meiji-era. He is best known for Ichiaku no Suna (A Handful of Sand) a collection of 551 tanka poems published in 1910.[1] The official naming citation was published by the Minor Planet Center on 10 November 1992 (M.P.C. 21131).[7]
Notes edit
- ^ Occultation Prediction Chart: Occultation by (4672) Takuboku - TYC 0312-00789u on 13 June 2005, 11:51 UT
References edit
- ^ a b c d e f "4672 Takuboku (1988 HB)". Minor Planet Center. Retrieved 16 May 2018.
- ^ a b c d e "JPL Small-Body Database Browser: 4672 Takuboku (1988 HB)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 16 May 2018.
- ^ a b "Asteroid 4672 Takuboku". Small Bodies Data Ferret. Retrieved 16 May 2018.
- ^ a b c Dunham, D. W.; Herald, D.; Frappa, E.; Hayamizu, T.; Talbot, J.; Timerson, B. (June 2016). "Asteroid Occultations V14.0". NASA Planetary Data System: EAR-A-3-RDR-OCCULTATIONS-V14.0. Bibcode:2016PDSS..243.....D. Retrieved 16 May 2018. list and timings
- ^ a b c Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121.
- ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 16 May 2018.
External links edit
- List of asteroid occultation fits, (best fits only), February 2017
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 4672 Takuboku at AstDyS-2, Asteroids—Dynamic Site
- 4672 Takuboku at the JPL Small-Body Database
