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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1636694549633923 3.2832e-08  
a 2.433521516181827 1.0178e-08 au
q 2.03522837598666 8.1727e-08 au
i 3.153554786123868 3.8674e-06 deg
node 46.37858439334135 6.685e-05 deg
peri 242.5177028708718 6.8047e-05 deg
M 354.1868568234427 1.5123e-05 deg
tp 2459418.890290661539
(2021-Jul-23.39029066)
5.8316e-05 TDB
period 1386.600053248256
3.80
8.6988e-06
2.382e-08
d
yr
n .2596278567541247 1.6288e-09 deg/d
Q 2.831814656376995 1.1844e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1166  
   data-arc span      16320 days (44.68 yr)  
   first obs. used      1976-10-22  
   last obs. used      2021-06-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52073  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 05:11:52  

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 15.31   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

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