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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3166984028743625 4.6707e-08  
a 2.758651929652417 1.5832e-08 au
q 1.884991269445218 1.2759e-07 au
i 10.93243102343987 4.7591e-06 deg
node 70.30816980336742 2.2289e-05 deg
peri 305.797295463979 2.3287e-05 deg
M 252.8446687819907 1.1684e-05 deg
tp 2459894.644190699570
(2022-Nov-11.14419070)
5.7563e-05 TDB
period 1673.569635905391
4.58
1.4407e-05
3.944e-08
d
yr
n .2151090652437908 1.8518e-09 deg/d
Q 3.632312589859615 2.0846e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1024  
   data-arc span      11193 days (30.64 yr)  
   first obs. used      1990-10-20  
   last obs. used      2021-06-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51111  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 05:04:46  

Additional Information
 Earth MOID = .910621 au 
 Jupiter MOID = 1.91278 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 14.46   n/a MPO614063  
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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