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21055 (1990 YR)
Classification: Main-belt Asteroid          SPK-ID: 2021055
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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1846450018525012 1.9562e-08  
a 2.783948918507885 1.1891e-08 au
q 2.269906665292728 5.564e-08 au
i 7.336924241023524 5.3301e-07 deg
node 29.3467168513551 2.4206e-06 deg
peri 11.49238607606505 6.7445e-06 deg
M 201.3895983117745 8.9255e-06 deg
tp 2459948.014264597091
(2023-Jan-03.51426460)
4.4704e-05 TDB
period 1696.64241683167
4.65
1.0871e-05
2.976e-08
d
yr
n .212183779226897 1.3595e-09 deg/d
Q 3.297991171723042 1.4087e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2267  
   data-arc span      10796 days (29.56 yr)  
   first obs. used      1990-12-23  
   last obs. used      2020-07-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45145  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 02:52:10  

Additional Information
 Earth MOID = 1.27746 au 
 Jupiter MOID = 2.13423 au 
 T_jup = 3.295 
[ 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 12.93   n/a E2021B10  
diameter diameter 8.268 km 0.124 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.149   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21055 (1990 YR)          Discovered 1990-Dec-23 by Hioki, T., Hayakawa, S. at Okutama
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1990 YR = 1999 XJ119 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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