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21918 (1999 VN45)
Classification: Main-belt Asteroid          SPK-ID: 2021918
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 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2608550442052136 4.3658e-08  
a 2.742593002664077 1.2178e-08 au
q 2.02717378371723 1.1947e-07 au
i 17.48141142728533 7.3362e-06 deg
node 23.43117883155708 1.2642e-05 deg
peri 113.281823015275 1.8205e-05 deg
M 165.3146696222152 1.1908e-05 deg
tp 2458438.685271045065
(2018-Nov-16.18527105)
5.4054e-05 TDB
period 1658.977409872415
4.54
1.1049e-05
3.025e-08
d
yr
n .2170011465241628 1.4453e-09 deg/d
Q 3.458012221610924 1.5354e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1157  
   data-arc span      16831 days (46.08 yr)  
   first obs. used      1974-06-20  
   last obs. used      2020-07-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49166  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:54:12  

Additional Information
 Earth MOID = 1.10467 au 
 Jupiter MOID = 1.79251 au 
 T_jup = 3.234 
[ 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 14.32   n/a E2021B10  
diameter diameter 4.120 km 0.197 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.137   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21918 (1999 VN45)          Discovered 1999-Nov-04 by CSS at Catalina
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 VN45 = 1992 GN7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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