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181991 (1999 VH121)
Classification: Main-belt Asteroid          SPK-ID: 2181991
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1876662324793098 3.2982e-08  
a 2.362572148323278 1.2669e-08 au
q 1.9191971342869 7.7534e-08 au
i 2.449375232638969 6.0052e-06 deg
node 26.92331951387245 0.00010033 deg
peri 60.32947501478485 0.00010235 deg
M 259.5296876286461 2.1473e-05 deg
tp 2459570.678591345793
(2021-Dec-22.17859135)
8.0912e-05 TDB
period 1326.404683524022
3.63
1.0669e-05
2.921e-08
d
yr
n .2714103806114013 2.1831e-09 deg/d
Q 2.805947162359657 1.5046e-08 au
  Orbit Determination Parameters
   # obs. used (total)      305  
   data-arc span      7128 days (19.52 yr)  
   first obs. used      1999-11-04  
   last obs. used      2019-05-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .57396  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:32:55  

Additional Information
 Earth MOID = .93661 au 
 Jupiter MOID = 2.4075 au 
 T_jup = 3.525 
[ 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 17.66   n/a MPCxxxxx  

181991 (1999 VH121)          Discovered 1999-Nov-04 by Spacewatch at Kitt Peak
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23

[ show close-approach data ]
Alternate Designations
 1999 VH121 = 2003 YZ93 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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