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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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457277.5 (2015-Sep-12.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .084412869053862 3.6058e-08  
q 2.491298649687469 1.0136e-07 au
tp 2457770.356855405264
(2017-Jan-16.85685541)
0.00014839 TDB
node 219.8873302786334 2.0009e-05 deg
peri 68.01684255080211 3.7706e-05 deg
i 11.67501609300932 5.0676e-06 deg
  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
 Jupiter MOID = 2.17148 au 
 T_jup = 3.324 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.300208764323168E-15 -3.626881557973733E-15 -3.433040936013339E-13 -3.838237798751942E-15 -2.183700123571558E-14 2.06210520656292E-15
q -3.626881557973733E-15 1.027481141769654E-14 1.07953627945598E-12 1.086658665760765E-14 7.400922523223773E-14 -6.009318397665207E-15
tp -3.433040936013339E-13 1.07953627945598E-12 2.201947453621342E-8 1.706742173417523E-11 4.752127008115239E-9 7.118656287580269E-12
node -3.838237798751942E-15 1.086658665760765E-14 1.706742173417523E-11 4.003572200102823E-10 -3.881526905482559E-10 -2.503549579472453E-11
peri -2.183700123571558E-14 7.400922523223773E-14 4.752127008115239E-9 -3.881526905482559E-10 1.421772848948229E-9 2.622031799210875E-11
i 2.06210520656292E-15 -6.009318397665207E-15 7.118656287580269E-12 -2.503549579472453E-11 2.622031799210875E-11 2.568017283940648E-11

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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