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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 | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1635024656456193 3.2968e-08  
a 2.433138563206494 1.0876e-08 au
q 2.035314408864793 8.2341e-08 au
i 3.153689242087304 3.8995e-06 deg
node 46.38064305205656 6.7324e-05 deg
peri 242.5116420399997 6.8629e-05 deg
M 303.2865524318025 1.6068e-05 deg
tp 2459418.889743192978
(2021-Jul-23.38974319)
6.2659e-05 TDB
period 1386.272761057802
3.80
9.295e-06
2.545e-08
d
yr
n .2596891536159884 1.7412e-09 deg/d
Q 2.830962717548195 1.2654e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1134  
   data-arc span      15938 days (43.64 yr)  
   first obs. used      1976-10-22  
   last obs. used      2020-06-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52714  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:54:16  

Additional Information
 Earth MOID = 1.01944 au 
 Jupiter MOID = 2.33518 au 
 T_jup = 3.486 
[ 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 15.31   n/a E2021B10  
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

[ show close-approach data ]
Alternate Designations
 1999 VQ21 = 1976 UM12 = 1998 HL148 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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