7648 Tomboles

7648 Tomboles, provisional designation 1989 TB1, is a background asteroid from the inner regions of the asteroid belt, approximately 4 kilometers (2.5 miles) in diameter. It was discovered on 8 October 1989, by Japanese astronomers Yoshikane Mizuno and Toshimasa Furuta at the Kani Observatory in Kani, Japan. The asteroid was named after Scottish amateur astronomer Tom Boles.[1]

7648 Tomboles
Discovery [1]
Discovered byY. Mizuno
T. Furuta
Discovery siteKani Obs.
Discovery date8 October 1989
Designations
(7648) Tomboles
Named after
Tom Boles [1]
(Scottish astronomer)
1989 TB1 · 1981 CE
1984 BK1 · 1986 WD10
main-belt [1][2] · (inner)
background [3]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc36.42 yr (13,301 d)
Aphelion2.3980 AU
Perihelion1.9152 AU
2.1566 AU
Eccentricity0.1119
3.17 yr (1,157 d)
316.41°
0° 18m 40.32s / day
Inclination2.7210°
11.756°
53.726°
Physical characteristics
Mean diameter
3.914±0.123 km[4]
0.200±0.027[4]
14.3[1][2]

    Orbit and classification

    Tomboles is a non-family asteroid from the main belt's background population.[3] It orbits the Sun in the inner main-belt at a distance of 1.9–2.4 AU once every 3 years and 2 months (1,157 days; semi-major axis of 2.16 AU). Its orbit has an eccentricity of 0.11 and an inclination of 3° with respect to the ecliptic.[2]

    The body's observation arc begins with its first observation as 1981 CE at the Klet Observatory in February 1981.[1]

    Physical characteristics

    Tomboles has an absolute magnitude of 14.3.[1][2] While its spectral type is unknown, it is likely a stony S-type asteroid based on the albedo (see below) derived from observations with the Wide-field Infrared Survey Explorer (WISE). As of 2018, no rotational lightcurve of this asteroid has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[2]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's WISE telescope, Tomboles measures 3.91 kilometers in diameter and its surface has an albedo of 0.20.[4]

    Naming

    This minor planet was named after Scottish amateur astronomer Tom Boles (born 1944) a discoverer of a minor planet (also see 84417 Ritabo) and a record-number of supernovae, using a robotic telescope at Coddenham Observatory (234) in Coddenham, Suffolk, in eastern England. Boles has been the President of the British Astronomical Association from 2003 to 2005.[1]

    The official naming citation was published by the Minor Planet Center on 13 November 2008 (M.P.C. 64311).[5]

    References
    1. "7648 Tomboles (1989 TB1)". Minor Planet Center. Retrieved 23 May 2018.
    2. "JPL Small-Body Database Browser: 7648 Tomboles (1989 TB1)" (2017-07-04 last obs.). Jet Propulsion Laboratory. Retrieved 23 May 2018.
    3. "Asteroid 7648 Tomboles". Small Bodies Data Ferret. Retrieved 23 May 2018.
    4. 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 23 May 2018.
    5. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 23 May 2018.

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