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21994 (1999 XU26)
Classification: Main-belt Asteroid          SPK-ID: 2021994
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1293625334151263 2.587e-08  
a 2.195630460886694 6.5677e-09 au
q 1.91159814202297 5.5992e-08 au
i 1.915903318746538 2.8793e-06 deg
node 102.3710966215956 0.00011407 deg
peri 149.3775442189501 0.00011518 deg
M 326.366113983667 1.7574e-05 deg
tp 2459311.522715391980
(2021-Apr-07.02271539)
5.8164e-05 TDB
period 1188.330647303252
3.25
5.3319e-06
1.46e-08
d
yr
n .3029459863018504 1.3593e-09 deg/d
Q 2.479662779750418 7.4174e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1598  
   data-arc span      10092 days (27.63 yr)  
   first obs. used      1992-09-28  
   last obs. used      2020-05-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51191  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:57:12  

Additional Information
 Earth MOID = .895888 au 
 Jupiter MOID = 2.54542 au 
 T_jup = 3.657 
[ 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 15.38   n/a E2021B10  
diameter diameter 2.131 km 0.223 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.355   0.059 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21994 (1999 XU26)          Discovered 1999-Dec-06 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 XU26 = 1998 KN28 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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