astro.wikisort.org - Asteroid

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 by	Y. Mizuno T. Furuta
Discovery site	Kani Obs.
Discovery date	8 October 1989
Designations
MPC designation	(7648) Tomboles
Named after	Tom Boles [1] (Scottish astronomer)
Alternative designations	1989 TB1 · 1981 CE 1984 BK1 · 1986 WD10
Minor planet category	main-belt [1][2] · (inner) background [3]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc	36.42 yr (13,301 d)
Aphelion	2.3980 AU
Perihelion	1.9152 AU
Semi-major axis	2.1566 AU
Eccentricity	0.1119
Orbital period (sidereal)	3.17 yr (1,157 d)
Mean anomaly	316.41°
Mean motion	0° 18m 40.32s / day
Inclination	2.7210°
Longitude of ascending node	11.756°
Argument of perihelion	53.726°
Physical characteristics
Mean diameter	3.914±0.123 km[4]
Geometric albedo	0.200±0.027[4]
Absolute magnitude (H)	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

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
• 7648 Tomboles at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 7648 Tomboles at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

---