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21960 (1999 VH189)
Classification: Main-belt Asteroid          SPK-ID: 2021960
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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1189521117759136 3.5574e-08  
a 2.76207805010857 1.2039e-08 au
q 2.433523033158258 9.8577e-08 au
i 4.233950296989235 5.0386e-06 deg
node 191.5168573884649 5.0091e-05 deg
peri 253.6836075416456 5.4341e-05 deg
M 195.6870880096266 2.2145e-05 deg
tp 2459965.782070243865
(2023-Jan-21.28207024)
0.00010536 TDB
period 1676.688349993653
4.59
1.0962e-05
3.001e-08
d
yr
n .2147089529198213 1.4038e-09 deg/d
Q 3.090633067058882 1.3471e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1435  
   data-arc span      9425 days (25.80 yr)  
   first obs. used      1994-10-27  
   last obs. used      2020-08-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52093  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:53:57  

Additional Information
 Earth MOID = 1.45345 au 
 Jupiter MOID = 2.12298 au 
 T_jup = 3.327 
[ 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 14.2   n/a MPO435904  
diameter diameter 4.155 km 0.130 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.234   0.042 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21960 (1999 VH189)          Discovered 1999-Nov-15 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 VH189 = 1997 LJ13 = 2000 ES21 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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