| 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 | 46.11yr (16,841 d) |
| Aphelion | 3.3411AU |
| 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] |
| 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] | |
4672 Takuboku, provisional designation1988 HB, is a backgroundasteroid from the outer regions of theasteroid belt, approximately 35 kilometers (22 miles) in diameter. It was discovered on 17 April 1988, by Japanese astronomersSeiji Ueda andHiroshi Kaneda at theKushiro Observatory on Hokkaido, Japan. The asteroid was named after the Japanese poetTakuboku Ishikawa.[1] In 2005, measurement of the body'soccultation ellipse also gave 35.0 × 35.0 kilometers.[4]
Takuboku is a non-family asteroid from the main belt'sbackground population.[3] It orbits the Sun in theouter 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 aneccentricity of 0.05 and aninclination of 16° with respect to theecliptic.[2]
The body'sobservation arc begins with its first observation as1971 HT atCrimea–Nauchnij in April 1971, or 17 years prior to its official discovery observation at Kushiro.[1]
Takuboku has anabsolute magnitude of between 10.90 and 11.4. As of 2018, no rotationallightcurve ofTakuboku has been obtained fromphotometric observations. The body'srotation period,pole and shape remain unknown.[2]
According to the surveys carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer and the Infrared Astronomical SatelliteIRAS,Takuboku measures 28.115 and 35.59 kilometers in diameter and its surface has analbedo of 0.108 and 0.0609, respectively.[5][6]
On 13 June 2005,Takubokuocculted 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]
Thisminor planet was named after Japanese poetTakuboku Ishikawa (1886–1912) who lived in Japan's lateMeiji-era. He is best known forIchiaku no Suna (A Handful of Sand) a collection of 551 tanka poems published in 1910.[1] The official naming citation was published by theMinor Planet Center on 10 November 1992 (M.P.C. 21131).[7]
