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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1507526826726128 3.4875e-08  
a 3.129382996126182 1.7478e-08 au
q 2.657620114350101 1.0782e-07 au
i 1.169394181268193 4.4653e-06 deg
node 47.31841314825858 0.0002016 deg
peri 34.74199027490858 0.00020217 deg
M 233.2046134539632 1.732e-05 deg
tp 2459712.676199602810
(2022-May-13.17619960)
9.9276e-05 TDB
period 2022.024924100249
5.54
1.694e-05
4.638e-08
d
yr
n .1780393484319641 1.4916e-09 deg/d
Q 3.601145877902263 2.0113e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2282  
   data-arc span      24061 days (65.88 yr)  
   first obs. used      1954-07-31  
   last obs. used      2020-06-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48139  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:41:44  

Additional Information
 Earth MOID = 1.67364 au 
 Jupiter MOID = 1.63381 au 
 T_jup = 3.196 
[ 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 12.0   n/a MPO347535  
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. 2019-August); 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] (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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