7648 Tomboles

7648 Tomboles
Discovery [1]
Discovered byY. Mizuno
T. Furuta
Discovery siteKani Obs.
Discovery date8 October 1989
(7648) Tomboles
Named after
Tom Boles[1]
(Scottish astronomer)
1989 TB1 · 1981 CE
1984 BK1 · 1986 WD10
main-belt[1][2] · (inner)
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
3.17 yr (1,157 d)
0° 18m 40.32s / day
Physical characteristics
Mean diameter
3.914±0.123 km[4]

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]

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]


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]


  1. ^ a b c d e f g h "7648 Tomboles (1989 TB1)". Minor Planet Center. Retrieved 23 May 2018.
  2. ^ a b c d e f "JPL Small-Body Database Browser: 7648 Tomboles (1989 TB1)" (2017-07-04 last obs.). Jet Propulsion Laboratory. Retrieved 23 May 2018.
  3. ^ a b "Asteroid 7648 Tomboles". Small Bodies Data Ferret. Retrieved 23 May 2018.
  4. ^ a b c 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.

External links[]