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21161 Yamashitaharuo (1993 TR1)
Classification: Main-belt Asteroid          SPK-ID: 2021161
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04648361770740339 5.0197e-08  
a 3.173297253292639 2.3054e-08 au
q 3.025790916898631 1.6501e-07 au
i 13.83109436539066 5.4196e-06 deg
node 33.07111368110374 1.6379e-05 deg
peri 353.3024825556502 4.8173e-05 deg
M 296.6644568380417 4.7645e-05 deg
tp 2459563.753292338331
(2021-Dec-15.25329234)
0.00027485 TDB
period 2064.736145190989
5.65
2.25e-05
6.16e-08
d
yr
n .1743564187794561 1.9e-09 deg/d
Q 3.320803589686646 2.4126e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1800  
   data-arc span      9890 days (27.08 yr)  
   first obs. used      1993-10-13  
   last obs. used      2020-11-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46063  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:40:48  

Additional Information
 Earth MOID = 2.0298 au 
 Jupiter MOID = 1.93264 au 
 T_jup = 3.155 
[ 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 12.78   n/a E2021B10  
diameter diameter 18.980 km 0.190 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.049   0.001 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21161 Yamashitaharuo           Discovered 1993 Oct. 15 by K. Endate and K. Watanabe at Kitami.
Haruo Yamashita (b. 1937) is the author of more than 500 works including novels and children's stories. He has been awarded many prizes including the Medal with Purple Ribbon from the Emperor of Japan.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2017-03-12Last Updated: 2017-03-14

[ show close-approach data ]
Alternate Designations
 1993 TR1 = 1999 XB37 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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