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181972 (1999 VD21)
Classification: Main-belt Asteroid          SPK-ID: 2181972
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 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1569594182722832 3.3953e-08  
a 2.326082065832503 1.1725e-08 au
q 1.960981577925842 8.2179e-08 au
i 1.882541896474227 6.7958e-06 deg
node 176.4055327585344 0.00011645 deg
peri 295.6937244084808 0.00011888 deg
M 291.0852255399992 2.5198e-05 deg
tp 2459448.553760070648
(2021-Aug-22.05376007)
9.1665e-05 TDB
period 1295.794034373053
3.55
9.7973e-06
2.682e-08
d
yr
n .277821930376597 2.1006e-09 deg/d
Q 2.691182553739163 1.3565e-08 au
  Orbit Determination Parameters
   # obs. used (total)      403  
   data-arc span      9227 days (25.26 yr)  
   first obs. used      1995-10-02  
   last obs. used      2021-01-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .58904  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:32:50  

Additional Information
 Earth MOID = .978308 au 
 Jupiter MOID = 2.41175 au 
 T_jup = 3.557 
[ 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 17.08   n/a MPCxxxxx  

181972 (1999 VD21)          Discovered 1999-Nov-12 by Farra d'Isonzo at Farra d'Isonzo
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23

[ show close-approach data ]
Alternate Designations
 1999 VD21 = 2004 BT87 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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