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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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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1511513244330177 3.0848e-08  
a 3.122107843378469 1.4172e-08 au
q 2.650197107829101 9.891e-08 au
i 1.169467614719218 3.3843e-06 deg
node 47.2169119591571 0.00019805 deg
peri 35.73551012268318 0.00019856 deg
M 302.9138701692514 1.7345e-05 deg
tp 2459716.020242752724
(2022-May-16.52024275)
9.8069e-05 TDB
period 2014.977854200633
5.52
1.3719e-05
3.756e-08
d
yr
n .1786620132074933 1.2165e-09 deg/d
Q 3.594018578927838 1.6314e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2651  
   data-arc span      24435 days (66.90 yr)  
   first obs. used      1954-07-31  
   last obs. used      2021-06-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4593  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 13:23:46  

Additional Information
 Earth MOID = 1.66626 au 
 Jupiter MOID = 1.63767 au 
 T_jup = 3.198 
[ show covariance matrix ]

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 12.09   n/a E2021B10  
diameter diameter 23.166 km 0.279 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 12.532 h n/a LCDB (Rev. 2020-October); 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.]
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.057   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

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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