2153 Akiyama

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2153 Akiyama
Discovery [1]
Discovery site Harvard College Obs.
(Agassiz Station)
Discovery date 1 December 1978
MPC designation 2153 Akiyama
Named after
Kaoru Akiyama
(Japanese astronomer)[2]
1978 XD · 1955 UQ1
1972 YA · 1973 AK3
1977 VW · 1979 FS
main-belt · Themis[3]
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 61.48 yr (22,454 days)    
Aphelion 3.5995 AU
Perihelion 2.6488 AU
3.1242 AU
Eccentricity 0.1522
5.52 yr (2,017 days)
0° 10m 42.6s / day
Inclination 1.1842°
Physical characteristics
Dimensions 16.79±1.4 km (IRAS:2)[1]
21.15±0.36 km[4]
15.42 km (calculated)[3]
12.5325±0.0053 h[5]
12.5132±0.0053 h[5]
0.1089±0.020 (IRAS:2)[1]
0.08 (assumed)[3]
11.970±0.002 (R)[5]
11.920±0.003 (R)[5]

2153 Akiyama, provisional designation 1978 XD, is a carbonaceous Themistian asteroid from the outer region of the asteroid belt, approximately 17 kilometers in diameter. It was discovered by staff members at the Agassiz Station of the Harvard College Observatory on 1 December 1978.[7]

The dark C-type asteroid is a member of the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun at a distance of 2.6–3.6 AU once every 5 years and 6 months (2,017 days). Its orbit has an eccentricity of 0.15 and an inclination of 1° with respect to the plane of the ecliptic.[1] The first precovery was taken at Palomar Observatory in 1954, extending the asteroid's observation arc by 24 years prior to its discovery.[7]

According to the space-based surveys carried out by the Infrared Astronomical Satellite IRAS and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 16.8 and 21.2 kilometers in diameter, respectively, with a corresponding albedo of 0.11 and 0.07.[1][4] The Collaborative Asteroid Lightcurve Link assumes an intermediary albedo of 0.08 and calculates a diameter of 15.4 kilometers, based on an absolute magnitude of 12.42.[3] Two rotational light-curves of this asteroid were obtained from photometric observations made at the U.S. Palomar Transient Factory in October 2010 and January 2012. They showed a rotation period of 12.5325±0.0053 and 12.5132±0.0053 hours with a brightness variation of 0.26 and 0.27 in magnitude, respectively (U=2/2).[5]

The minor planet was named in memory of Kaoru Akiyama (1901–1970), professor at Hosei University, Tokyo, and widely known for his studies on minor planets. In collaboration with astronomer Kiyotsugu Hirayama, after whom the asteroid 1999 Hirayama is named, he made the first detailed orbital analysis of the asteroid 153 Hilda, which has a 2:3 orbital resonance with Jupiter.[2] Naming citation was published on 1 November 1979 (M.P.C. 5014).[8]


  1. ^ a b c d e f g "JPL Small-Body Database Browser: 2153 Akiyama (1978 XD)" (2016-01-21 last obs.). Jet Propulsion Laboratory. Retrieved 4 May 2016. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (2153) Akiyama. Springer Berlin Heidelberg. p. 175. ISBN 978-3-540-00238-3. Retrieved 4 May 2016. 
  3. ^ a b c d e f "LCDB Data for (2153) Akiyama". Asteroid Lightcurve Database (LCDB). Retrieved 4 May 2016. 
  4. ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794free to read. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 4 May 2016. 
  5. ^ a b c d e 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:1504.04041free to read. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 4 May 2016. 
  6. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762free to read. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 4 May 2016. 
  7. ^ a b "2153 Akiyama (1978 XD)". Minor Planet Center. Retrieved 4 May 2016. 
  8. ^ "MPC/MPO/MPS Archive" (PDF). Minor Planet Center (PDF). p. 78. ISSN 0736-6884. Retrieved 4 May 2016. 

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