120375 Kugel

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120375 Kugel
Discovery [1]
Discovered by C. Rinner
Discovery site Ottmarsheim Obs.
Discovery date 10 August 2005
MPC designation (120375) Kugel
Named after
François Kugel[1]
(French astronomer)
2005 PB6 · 1998 SM108
2001 KE74
main-belt[1][2] · (inner)
background[3] · near-Flora[4]
Orbital characteristics[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc 19.42 yr (7,093 d)
Aphelion 2.8291 AU
Perihelion 1.8056 AU
2.3174 AU
Eccentricity 0.2208
3.53 yr (1,289 d)
0° 16m 45.84s / day
Inclination 2.7595°
Physical characteristics
Mean diameter
1.05 km (calculated)[4]
6.923±0.0085 h[5]
0.24 (assumed)[4]
S (assumed)[4]
16.619±0.003 (R)[5]
16.7[2] · 17.07[4]

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.[1] The presumed S-type asteroid in the region of the Florian clan has a tentative rotation period of 6.9 hours.[4] It was named after French astronomer François Kugel.[1]

Orbit and classification[edit]

Kugel is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[3] 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.[4]

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.[2] 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.[1]


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.[1] The official naming citation was published by the Minor Planet Center on 6 August 2009 (M.P.C. 66728).[6]

Physical characteristics[edit]

Kugel is an assumed stony S-type asteroid, based on its proximity to the Flora asteroids.[4]

Rotation period[edit]

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).[5] As of 2018, no secure period has been obtained.[4]

Diameter and albedo[edit]

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.[4]


  1. ^ a b c d e f g "120375 Kugel (2005 PB6)". Minor Planet Center. Retrieved 4 April 2018.
  2. ^ a b c d "JPL Small-Body Database Browser: 120375 Kugel (2005 PB6)" (2018-02-26 last obs.). Jet Propulsion Laboratory. Retrieved 4 April 2018.
  3. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 4 April 2018.
  4. ^ a b c d e f g h i j "LCDB Data for (120375) Kugel". Asteroid Lightcurve Database (LCDB). Retrieved 4 April 2018.
  5. ^ a b c 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.
  6. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 4 April 2018.

External links[edit]