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21894 (1999 VQ4)
Classification: Main-belt Asteroid          SPK-ID: 2021894
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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05081558398429495 3.2448e-08  
a 2.581961492710728 9.456e-09 au
q 2.450757611633671 8.6564e-08 au
i 14.94587222127369 3.4511e-06 deg
node 172.8765813589463 1.2562e-05 deg
peri 296.654276602157 3.4491e-05 deg
M 340.2748460810792 3.2209e-05 deg
tp 2459283.531133791621
(2021-Mar-10.03113379)
0.0001356 TDB
period 1515.385293714304
4.15
8.3248e-06
2.279e-08
d
yr
n .2375633454364715 1.3051e-09 deg/d
Q 2.713165373787786 9.9365e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1789  
   data-arc span      11137 days (30.49 yr)  
   first obs. used      1990-07-24  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47517  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:54:56  

Additional Information
 Earth MOID = 1.49641 au 
 Jupiter MOID = 2.33279 au 
 T_jup = 3.375 
[ 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 14.1   n/a MPO502328  
diameter diameter 4.403 km 0.306 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.251   0.069 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21894 (1999 VQ4)          Discovered 1999-Nov-01 by CSS at Catalina
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 VQ4 = 2000 CZ65 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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