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JPL Small-Body Database Browser
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2153 Akiyama (1978 XD)
Classification: Main-belt Asteroid          SPK-ID: 2002153
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1505525283171175 3.6209e-08  
a 3.132927921083119 1.6027e-08 au
q 2.661257701528764 1.1205e-07 au
i 1.178193890342969 4.6481e-06 deg
node 47.74774169546823 0.00020048 deg
peri 32.8808225340147 0.0002011 deg
M 163.9375575253079 1.726e-05 deg
tp 2457678.140996833028
9.4401e-05 TDB
period 2025.461682804746
n .1777372551928468 1.3639e-09 deg/d
Q 3.604598140637473 1.844e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2183  
   data-arc span      23761 days (65.05 yr)  
   first obs. used      1954-07-31  
   last obs. used      2019-08-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48605  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-23 19:22:41  

Additional Information
 Earth MOID = 1.67702 au 
 Jupiter MOID = 1.63723 au 
 T_jup = 3.195 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.0   n/a MPO347535  
diameter diameter 23.166 km 0.279 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 12.532 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.057   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

2153 Akiyama           Discovered 1978 Dec. 1 at the Harvard College Observatory, Agassiz Station.
Named in memory of Kaoru Akiyama (1901-1970), professor at Hosei Univer sity, Tokyo, during 1930-1940 and 1949-1970, well known for his work on minor planets. Initially in collaboration with K. Hirayama, he made the first de tailed study of the orbit of the 3/2 commensurability object (153) Hilda. Name proposed by K. Tomita.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 5014Last Updated: 2006-03-21

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Alternate Designations
 1978 XD = 1955 UQ1 = 1972 YA = 1973 AK3 = 1977 VW = 1979 FS 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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