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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3166984084290931 4.6342e-08  
a 2.758651930603473 1.5796e-08 au
q 1.884991254771508 1.2667e-07 au
i 10.93243104061394 4.7585e-06 deg
node 70.3081693293709 2.2072e-05 deg
peri 305.7972957921651 2.3095e-05 deg
M 252.8446682084893 1.1667e-05 deg
tp 2459894.644193623272
(2022-Nov-11.14419362)
5.7473e-05 TDB
period 1673.569636770846
4.58
1.4374e-05
3.935e-08
d
yr
n .2151090651325512 1.8476e-09 deg/d
Q 3.632312606435439 2.0799e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1027  
   data-arc span      11241 days (30.78 yr)  
   first obs. used      1990-10-20  
   last obs. used      2021-07-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5118  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:56:39  

Additional Information
 Earth MOID = .910621 au 
 Jupiter MOID = 1.91278 au 
 T_jup = 3.242 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457740.5 (2016-Dec-18.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3156617753469635 4.6339e-08  
q 1.888912412893438 1.2656e-07 au
tp 2458220.952979584020
(2018-Apr-12.45297958)
4.7374e-05 TDB
node 70.32409939522827 2.2068e-05 deg
peri 305.8787206376904 2.3095e-05 deg
i 10.93010853705536 4.7572e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1027  
   data-arc span      11241 days (30.78 yr)  
   first obs. used      1990-10-20  
   last obs. used      2021-07-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5118  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:56:39  

Additional Information
 Jupiter MOID = 1.91278 au 
 T_jup = 3.242 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.147348419877822E-15 -5.84363309827117E-15 9.471332727902222E-13 7.791845789727494E-15 1.165339516131374E-13 9.026696508776959E-16
q -5.84363309827117E-15 1.601690420721515E-14 -2.287670948680268E-12 -1.971585436330722E-14 -2.796555232936573E-13 -1.860586157136555E-15
tp 9.471332727902222E-13 -2.287670948680268E-12 2.24431772211647E-9 1.387180083371099E-11 3.453364523995809E-10 -2.050019833392121E-12
node 7.791845789727494E-15 -1.971585436330722E-14 1.387180083371099E-11 4.869987974790877E-10 -4.756041975508921E-10 -2.484731439545385E-11
peri 1.165339516131374E-13 -2.796555232936573E-13 3.453364523995809E-10 -4.756041975508921E-10 5.333857606732208E-10 2.406604927794514E-11
i 9.026696508776959E-16 -1.860586157136555E-15 -2.050019833392121E-12 -2.484731439545385E-11 2.406604927794514E-11 2.263105747352147E-11

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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