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48439 (1989 WR2)
Classification: Main-belt Asteroid          SPK-ID: 2048439
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2434948698479771 3.1266e-08  
a 2.683350086765421 1.5068e-08 au
q 2.029968106631917 8.1823e-08 au
i 13.2890636555997 4.7248e-06 deg
node 54.63203746493633 2.2198e-05 deg
peri 34.57875389827456 2.5581e-05 deg
M 223.8230423044505 1.2839e-05 deg
tp 2459207.817169562014
(2020-Dec-24.31716956)
5.9765e-05 TDB
period 1605.515240920017
4.40
1.3524e-05
3.703e-08
d
yr
n .224227083508536 1.8887e-09 deg/d
Q 3.336732066898926 1.8737e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1350  
   data-arc span      11842 days (32.42 yr)  
   first obs. used      1987-05-30  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49346  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 06:37:07  

Additional Information
 Earth MOID = 1.05957 au 
 Jupiter MOID = 2.00001 au 
 T_jup = 3.295 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456625.5 (2013-Nov-29.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .241243630349501 3.1061e-08  
q 2.0375842571973 8.117e-08 au
tp 2455991.135904679154
(2012-Mar-04.63590468)
5.2236e-05 TDB
node 54.69198174750758 2.2196e-05 deg
peri 34.19225393679611 2.5701e-05 deg
i 13.28566850593348 4.7305e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1350  
   data-arc span      11842 days (32.42 yr)  
   first obs. used      1987-05-30  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49346  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 06:37:07  

Additional Information
 Jupiter MOID = 2.00001 au 
 T_jup = 3.295 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.647805663113164E-16 -2.497571431881356E-15 -1.168287544393116E-13 4.345437272057231E-15 -3.679295150759088E-14 -7.48914518215581E-16
q -2.497571431881356E-15 6.588489138527518E-15 3.72744015756663E-13 -9.395558805073101E-15 1.255312912918256E-13 1.503742779140454E-15
tp -1.168287544393116E-13 3.72744015756663E-13 2.728647406315111E-9 -1.086740687263332E-11 7.077047417535379E-10 -4.203548951365208E-12
node 4.345437272057231E-15 -9.395558805073101E-15 -1.086740687263332E-11 4.926587922764502E-10 -4.816740250629392E-10 -4.849430845328796E-11
peri -3.679295150759088E-14 1.255312912918256E-13 7.077047417535379E-10 -4.816740250629392E-10 6.605552034933145E-10 4.604270437742903E-11
i -7.48914518215581E-16 1.503742779140454E-15 -4.203548951365208E-12 -4.849430845328796E-11 4.604270437742903E-11 2.237763085033263E-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 13.5   n/a MPO412506  
diameter diameter 10.499 km 0.358 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.101   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

48439 (1989 WR2)          Discovered 1989-Nov-20 by Ueda, S., Kaneda, H. at Kushiro
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1989 WR2 = 1987 KR3 = 1998 XW38 = 2000 HL57 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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