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21051 (1990 UM)
Classification: Main-belt Asteroid          SPK-ID: 2021051
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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .316530443509391 6.1509e-08  
a 2.758884354313396 1.7739e-08 au
q 1.885613466051457 1.6535e-07 au
i 10.93165588211395 4.8186e-06 deg
node 70.3101255908208 2.7336e-05 deg
peri 305.7954103935472 2.8053e-05 deg
M 210.6712021945127 1.2092e-05 deg
tp 2459894.788128346793
(2022-Nov-11.28812835)
6.1464e-05 TDB
period 1673.781145217663
4.58
1.6143e-05
4.42e-08
d
yr
n .2150818827351438 2.0743e-09 deg/d
Q 3.632155242575335 2.3353e-08 au
  Orbit Determination Parameters
   # obs. used (total)      924  
   data-arc span      10804 days (29.58 yr)  
   first obs. used      1990-10-20  
   last obs. used      2020-05-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5209  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:59:11  

Additional Information
 Earth MOID = .910692 au 
 Jupiter MOID = 1.91198 au 
 T_jup = 3.242 
[ 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 14.44   n/a E2021B10  
diameter diameter 6.981 km 0.276 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.076   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21051 (1990 UM)          Discovered 1990-Oct-20 by Urata, T. at Oohira
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1990 UM = 1999 SM8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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