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66139 (1998 SH138)
Classification: Main-belt Asteroid          SPK-ID: 2066139
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2343730096965737 4.6794e-08  
a 3.087238449376642 1.7408e-08 au
q 2.363673082345255 1.4357e-07 au
i .675462285011729 5.6283e-06 deg
node 173.4421729480864 0.00035992 deg
peri 166.1595738848011 0.00036009 deg
M 27.45565413367386 9.976e-06 deg
tp 2458849.393556830922
(2019-Dec-31.89355683)
5.4369e-05 TDB
period 1981.315734675917
5.42
1.6758e-05
4.588e-08
d
yr
n .1816974416038163 1.5368e-09 deg/d
Q 3.810803816408029 2.1487e-08 au
  Orbit Determination Parameters
   # obs. used (total)      621  
   data-arc span      8077 days (22.11 yr)  
   first obs. used      1998-09-18  
   last obs. used      2020-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52583  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 22:19:16  

Additional Information
 Earth MOID = 1.35501 au 
 Jupiter MOID = 1.5966 au 
 T_jup = 3.183 
[ 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 15.3   n/a MPO449420  
diameter diameter 5.200 km 0.250 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.054   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

66139 (1998 SH138)          Discovered 1998-Sep-26 by LINEAR at Socorro
Reference: 20030910/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 SH138 = 1999 XS218 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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