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21908 (1999 VQ21)
Classification: Main-belt Asteroid          SPK-ID: 2021908
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .163669454879059 3.2809e-08  
a 2.4335215162432 1.0093e-08 au
q 2.035228376243215 8.1622e-08 au
i 3.153554738788173 3.8606e-06 deg
node 46.37858499003483 6.6787e-05 deg
peri 242.5177023877417 6.7967e-05 deg
M 354.1868566618921 1.494e-05 deg
tp 2459418.890291284625
(2021-Jul-23.39029128)
5.7609e-05 TDB
period 1386.600053300712
3.80
8.626e-06
2.362e-08
d
yr
n .259627856744303 1.6151e-09 deg/d
Q 2.831814656243186 1.1744e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1171  
   data-arc span      16322 days (44.69 yr)  
   first obs. used      1976-10-22  
   last obs. used      2021-06-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51973  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:03:31  

Additional Information
 Earth MOID = 1.02095 au 
 Jupiter MOID = 2.33332 au 
 T_jup = 3.485 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.32   n/a MPO636392  
diameter diameter 2.194 km 0.402 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.367   0.094 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21908 (1999 VQ21)          Discovered 1999-Nov-12 by Korlevic, K. at Visnjan
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 VQ21 = 1976 UM12 = 1998 HL148 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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