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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2613916809822869 4.3711e-08  
a 2.741227232531554 1.2294e-08 au
q 2.024693238265709 1.1991e-07 au
i 17.50886104527305 7.024e-06 deg
node 23.25208413249161 1.2353e-05 deg
peri 113.6191109452269 1.7646e-05 deg
M 207.5958569903274 1.1546e-05 deg
tp 2460098.294977404766
(2023-Jun-02.79497740)
5.4092e-05 TDB
period 1657.738345404962
4.54
1.1152e-05
3.053e-08
d
yr
n .2171633424526095 1.4609e-09 deg/d
Q 3.457761226797399 1.5508e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1181  
   data-arc span      17184 days (47.05 yr)  
   first obs. used      1974-06-20  
   last obs. used      2021-07-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48936  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 10:14:38  

Additional Information
 Earth MOID = 1.10272 au 
 Jupiter MOID = 1.79047 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 14.33   n/a MPCxxxxx  
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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