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49661 (1999 JH138)
Classification: Main-belt Asteroid          SPK-ID: 2049661
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2174201421283353 3.6964e-08  
a 3.111132245768129 2.2358e-08 au
q 2.434709430713176 1.2068e-07 au
i 19.72847241902745 5.8892e-06 deg
node 54.57547101309928 1.2396e-05 deg
peri 100.4928850111471 1.9146e-05 deg
M 325.985952627425 1.518e-05 deg
tp 2459189.879055657034
(2020-Dec-06.37905566)
8.5528e-05 TDB
period 2004.361882893772
5.49
2.1606e-05
5.915e-08
d
yr
n .1796082848473722 1.9361e-09 deg/d
Q 3.787555060823082 2.7219e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1296  
   data-arc span      8388 days (22.97 yr)  
   first obs. used      1997-11-29  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50945  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 21:28:25  

Additional Information
 Earth MOID = 1.53222 au 
 Jupiter MOID = 1.61639 au 
 T_jup = 3.093 
[ 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 13.4   n/a MPO502487  
diameter diameter 13.725 km 0.051 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.054   0.002 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

49661 (1999 JH138)          Discovered 1999-May-08 by LINEAR at Socorro
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 JH138 = 1997 WV30 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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