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181965 (1999 UN41)
Classification: Main-belt Asteroid          SPK-ID: 2181965
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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05399762317588231 4.0594e-08  
a 2.27502901103507 1.1457e-08 au
q 2.152182851782998 9.3414e-08 au
i 5.872881677655016 4.5034e-06 deg
node 225.1374056943577 4.7107e-05 deg
peri 235.4753320429864 6.8741e-05 deg
M 352.5302111320376 5.2498e-05 deg
tp 2459226.506664886990
(2021-Jan-12.00666489)
0.00018286 TDB
period 1253.368672770833
3.43
9.4683e-06
2.592e-08
d
yr
n .2872259438271622 2.1698e-09 deg/d
Q 2.397875170287142 1.2076e-08 au
  Orbit Determination Parameters
   # obs. used (total)      415  
   data-arc span      7768 days (21.27 yr)  
   first obs. used      1999-10-13  
   last obs. used      2021-01-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54541  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:32:47  

Additional Information
 Earth MOID = 1.17479 au 
 Jupiter MOID = 2.68222 au 
 T_jup = 3.601 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457386.5 (2015-Dec-30.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05350387670398143 4.0421e-08  
q 2.153176473804146 9.3018e-08 au
tp 2457970.066005244444
(2017-Aug-04.56600524)
0.00018103 TDB
node 225.163877380144 4.708e-05 deg
peri 234.6211035054165 6.9194e-05 deg
i 5.873996104309516 4.5054e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      415  
   data-arc span      7768 days (21.27 yr)  
   first obs. used      1999-10-13  
   last obs. used      2021-01-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54541  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:32:47  

Additional Information
 Jupiter MOID = 2.68222 au 
 T_jup = 3.601 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.633817172545758E-15 -3.733906806820393E-15 2.382535711399058E-13 -7.706538353049098E-16 1.03823323102202E-13 1.774598842191444E-15
q -3.733906806820393E-15 8.652406644155336E-15 2.596594073212426E-13 2.436175116117045E-15 -2.560427155912466E-14 -3.687584871603923E-15
tp 2.382535711399058E-13 2.596594073212426E-13 3.277111262094015E-8 -5.914773923982322E-12 9.198182349302606E-9 6.878853936431767E-12
node -7.706538353049098E-16 2.436175116117045E-15 -5.914773923982322E-12 2.216564630937652E-9 -2.206116201513623E-9 -2.195394806255715E-11
peri 1.03823323102202E-13 -2.560427155912466E-14 9.198182349302606E-9 -2.206116201513623E-9 4.787852894513465E-9 2.380213827709354E-11
i 1.774598842191444E-15 -3.687584871603923E-15 6.878853936431767E-12 -2.195394806255715E-11 2.380213827709354E-11 2.029902510580811E-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 16.65   n/a MPCxxxxx  

181965 (1999 UN41)          Discovered 1999-Oct-18 by Spacewatch at Kitt Peak
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23

[ show close-approach data ]
Alternate Designations
 1999 UN41 = 2003 YN91 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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