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JPL Small-Body Database Browser
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66957 (1999 XO21)
Classification: Main-belt Asteroid          SPK-ID: 2066957
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1463069042036428 6.0372e-08  
a 2.741934338964222 1.7449e-08 au
q 2.340770414300705 1.6049e-07 au
i 6.610308029544311 5.9036e-06 deg
node 165.047507334403 4.2162e-05 deg
peri 200.2397467208025 4.4814e-05 deg
M 227.0499454811315 1.4912e-05 deg
tp 2459612.949129459580
(2022-Feb-02.44912946)
7.0553e-05 TDB
period 1658.379813406979
4.54
1.583e-05
4.334e-08
d
yr
n .2170793427956744 2.0722e-09 deg/d
Q 3.143098263627738 2.0002e-08 au
  Orbit Determination Parameters
   # obs. used (total)      669  
   data-arc span      7416 days (20.30 yr)  
   first obs. used      1999-10-10  
   last obs. used      2020-01-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51652  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 15:06:40  

Additional Information
 Earth MOID = 1.33983 au 
 Jupiter MOID = 2.31448 au 
 T_jup = 3.324 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456806.5 (2014-May-29.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1441499936522668 6.0283e-08  
q 2.350076749969097 1.6018e-07 au
tp 2456296.363631244658
(2013-Jan-03.86363124)
6.8128e-05 TDB
node 165.0726602969874 4.2218e-05 deg
peri 200.7460250497618 4.4959e-05 deg
i 6.601798673421724 5.8954e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      669  
   data-arc span      7416 days (20.30 yr)  
   first obs. used      1999-10-10  
   last obs. used      2020-01-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51652  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 15:06:40  

Additional Information
 Jupiter MOID = 2.31448 au 
 T_jup = 3.324 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.634085739057913E-15 -9.618502728768751E-15 3.659125226513484E-13 3.270159766260829E-16 7.48996901030033E-14 -6.497137133093517E-15
q -9.618502728768751E-15 2.565652276304965E-14 -1.157778364386704E-12 -3.341223056143456E-15 -2.276059134784113E-13 1.744019637937427E-14
tp 3.659125226513484E-13 -1.157778364386704E-12 4.641356811029738E-9 3.028544119418499E-12 1.077516259707535E-9 -2.872509881830494E-12
node 3.270159766260829E-16 -3.341223056143456E-15 3.028544119418499E-12 1.782390150141203E-9 -1.769385881097454E-9 9.039249629162496E-11
peri 7.48996901030033E-14 -2.276059134784113E-13 1.077516259707535E-9 -1.769385881097454E-9 2.021306768041671E-9 -9.04266697278514E-11
i -6.497137133093517E-15 1.744019637937427E-14 -2.872509881830494E-12 9.039249629162496E-11 -9.04266697278514E-11 3.475538072345587E-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 15.2   n/a MPO385243  

66957 (1999 XO21)          Discovered 1999-Dec-05 by LINEAR at Socorro
Reference: 20030910/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 XO21 = 2001 DT53 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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