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21490 (1998 JW)
Classification: Main-belt Asteroid          SPK-ID: 2021490
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08543465171958961 3.601e-08  
a 2.719582408718641 1.3766e-08 au
q 2.487235832807041 1.0134e-07 au
i 11.6804110316206 5.0695e-06 deg
node 219.8443482873853 1.9999e-05 deg
peri 68.99763647495897 3.7461e-05 deg
M 356.4868446626729 3.2588e-05 deg
tp 2459412.486250502922
(2021-Jul-16.98625050)
0.00014831 TDB
period 1638.142817058141
4.48
1.2438e-05
3.405e-08
d
yr
n .2197610588352157 1.6685e-09 deg/d
Q 2.951928984630241 1.4942e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1398  
   data-arc span      9403 days (25.74 yr)  
   first obs. used      1995-10-27  
   last obs. used      2021-07-25  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50152  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:00:28  

Additional Information
 Earth MOID = 1.49934 au 
 Jupiter MOID = 2.17148 au 
 T_jup = 3.324 
[ 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 14.31   n/a MPO636386  
diameter diameter 6.612 km 0.315 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.101   0.030 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21490 (1998 JW)          Discovered 1998-May-01 by JPL/GEODSS NEAT at Haleakala
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1998 JW = 1995 UE7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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