4672 Takuboku

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]

4672 Takuboku
Discovery [1]
Discovered byS. Ueda
H. Kaneda
Discovery siteKushiro Obs.
Discovery date17 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 arc46.11 yr (16,841 d)
Aphelion3.3411 AU
Perihelion3.0318 AU
3.1864 AU
Eccentricity0.0485
5.69 yr (2,078 d)
45.665°
0° 10m 23.88s / day
Inclination15.530°
91.663°
175.66°
Physical characteristics
Dimensions35.0 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

    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 on April 1971, or 17 years prior to its official discovery observation at Kushiro.[1]

    Physical characteristics

    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

    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

    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][lower-alpha 1]

    Naming

    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
    1. Occultation Prediction Chart: Occultation by (4672) Takuboku - TYC 0312-00789u on 13 June 2005, 11:51 UT
    gollark: CPU usage on one core has already reached 100%.
    gollark: My computer will not survive.
    gollark: It is too late. I am opening Teams.
    gollark: But in general, people didn't do very well on the literally-just-programming-to-a-simple-spec section of the exam, despite it being very easy. I can try and find the paper, but it *may* require MS Teams interaction, which will bring my computer to its knees.
    gollark: This is admittedly not an unbiased sample, as (some offense, [REDACTED]) they were among the worst programmers in said group at this point.

    References
    1. "4672 Takuboku (1988 HB)". Minor Planet Center. Retrieved 16 May 2018.
    2. "JPL Small-Body Database Browser: 4672 Takuboku (1988 HB)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 16 May 2018.
    3. "Asteroid 4672 Takuboku". Small Bodies Data Ferret. Retrieved 16 May 2018.
    4. 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
    5. 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.
    6. 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.
    7. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 16 May 2018.

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