|Discovered by||C. Rinner|
|Discovery site||Ottmarsheim Obs.|
|Discovery date||10 August 2005|
|MPC designation||(120375) Kugel|
François Kugel |
2005 PB6 · 1998 SM108|
main-belt  · (inner)|
background  · near-Flora 
|Orbital characteristics |
|Epoch 23 March 2018 (JD 2458200.5)|
|Uncertainty parameter 0|
|Observation arc||19.42 yr (7,093 d)|
|3.53 yr (1,289 d)|
|0° 16m 45.84s / day|
|km 1.05 (calculated)|
16.7 · 17.07
120375 Kugel, provisional designation 2005 PB6, is a background asteroid from the inner regions of the asteroid belt, approximately 1 kilometer (0.6 miles) in diameter. It was discovered on 10 August 2005, by French amateur astronomer Claudine Rinner at her Ottmarsheim Observatory (224) in France. The presumed S-type asteroid in the region of the Florian clan has a tentative rotation period of 6.9 hours. It was named after French astronomer François Kugel.
Orbit and classification
Kugel is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements. Based on osculating Keplerian orbital elements, the asteroid has also been considered a member of the Flora family (402), a giant asteroid clan and the largest family of stony asteroids in the main belt.
It orbits the Sun in the inner asteroid belt at a distance of 1.8–2.8 AU once every 3 years and 6 months (1,289 days; semi-major axis of 2.32 AU). Its orbit has an eccentricity of 0.22 and an inclination of 3° with respect to the ecliptic. The body's observation arc begins with its first observation as 1998 SM108 at Lincoln Laboratory ETS in September 1998, nearly 7 years prior to its official discovery observation at Ottmarsheim.
This minor planet was named after French amateur astronomer François Kugel (born 1959), an active observer of comets and a collaborator of the discoverer. He has founded the Chante-Perdrix Observatory (A77) in 2005. The official naming citation was published by the Minor Planet Center on 6 August 2009 (M.P.C. 66728).
In August 2012, a rotational lightcurve of Kugel was obtained from photometric observations in the R-band by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a tentative rotation period of 6.923 hours with a brightness amplitude of 0.09 magnitude (U=1). As of 2018, no secure period has been obtained.
Diameter and albedo
Kugel has not been observed by any of the space-based surveys such as the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the Akari satellite or IRAS. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora the parent body of the Flora family – and calculates a diameter of 1.05 kilometers based on an absolute magnitude of 17.07.
- "120375 Kugel (2005 PB6)". Minor Planet Center. Retrieved 4 April 2018.
- "JPL Small-Body Database Browser: 120375 Kugel (2005 PB6)" (2018-02-26 last obs.). Jet Propulsion Laboratory. Retrieved 4 April 2018.
- "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 4 April 2018.
- "LCDB Data for (120375) Kugel". Asteroid Lightcurve Database (LCDB). Retrieved 4 April 2018.
- Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 4 April 2018.
- "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 4 April 2018.
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (120001)-(125000) – Minor Planet Center
- 120375 Kugel at AstDyS-2, Asteroids—Dynamic Site
- 120375 Kugel at the JPL Small-Body Database