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181736 (1995 US21)
Classification: Main-belt Asteroid          SPK-ID: 2181736
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06188995210925304 4.0144e-08  
a 3.080520753733055 2.8385e-08 au
q 2.889867471812956 1.3104e-07 au
i 2.346027273902505 5.1464e-06 deg
node 8.995236885474728 0.00010898 deg
peri 294.1898523569121 0.00011844 deg
M 308.0762173925444 4.8472e-05 deg
tp 2459485.338347541215
(2021-Sep-27.83834754)
0.000267 TDB
period 1974.852369482685
5.41
2.7295e-05
7.473e-08
d
yr
n .1822921072800507 2.5195e-09 deg/d
Q 3.271174035653154 3.0141e-08 au
  Orbit Determination Parameters
   # obs. used (total)      344  
   data-arc span      9913 days (27.14 yr)  
   first obs. used      1993-04-21  
   last obs. used      2020-06-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53564  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:31:49  

Additional Information
 Earth MOID = 1.87364 au 
 Jupiter MOID = 1.87928 au 
 T_jup = 3.224 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457641.5 (2016-Sep-10.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06063223248875035 4.0158e-08  
q 2.895632165565568 1.3102e-07 au
tp 2457508.334441910025
(2016-Apr-29.83444191)
0.00026554 TDB
node 9.026692352785757 0.00010895 deg
peri 293.9832554382748 0.00011876 deg
i 2.346064518839647 5.1459e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      344  
   data-arc span      9913 days (27.14 yr)  
   first obs. used      1993-04-21  
   last obs. used      2020-06-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53564  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:31:49  

Additional Information
 Jupiter MOID = 1.87928 au 
 T_jup = 3.224 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.612704348869582E-15 -5.152909691792296E-15 -1.073754518721333E-12 1.094971658947219E-14 -1.652722102335329E-13 6.441763405638E-16
q -5.152909691792296E-15 1.716617749880245E-14 4.664233822067364E-12 -3.359385761914762E-14 7.519063098104604E-13 -1.412117989484217E-15
tp -1.073754518721333E-12 4.664233822067364E-12 7.051030079805332E-8 -4.786808893930349E-11 1.257669029689541E-8 2.768504045029492E-12
node 1.094971658947219E-14 -3.359385761914762E-14 -4.786808893930349E-11 1.186974832075347E-8 -1.186750807510687E-8 7.563146201626808E-11
peri -1.652722102335329E-13 7.519063098104604E-13 1.257669029689541E-8 -1.186750807510687E-8 1.410377994095406E-8 -7.504298315844302E-11
i 6.441763405638E-16 -1.412117989484217E-15 2.768504045029492E-12 7.563146201626808E-11 -7.504298315844302E-11 2.648029898182771E-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 15.79   n/a MPCxxxxx  

181736 (1995 US21)          Discovered 1995-Oct-19 by Spacewatch at Kitt Peak
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23

[ show close-approach data ]
Alternate Designations
 1995 US21 = 2006 US278 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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