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49643 (1999 JH31)
Classification: Main-belt Asteroid          SPK-ID: 2049643
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 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .100057251507749 3.6939e-08  
a 3.043327556697644 2.016e-08 au
q 2.738820565936684 1.0599e-07 au
i 10.06443481327666 5.0565e-06 deg
node 226.5308222510457 2.2026e-05 deg
peri 239.1777477076777 3.4229e-05 deg
M 95.92266343229488 2.677e-05 deg
tp 2458483.797928250740
(2018-Dec-31.29792825)
0.00014302 TDB
period 1939.194963670153
5.31
1.9269e-05
5.276e-08
d
yr
n .1856440464957984 1.8446e-09 deg/d
Q 3.347834547458604 2.2177e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1358  
   data-arc span      7731 days (21.17 yr)  
   first obs. used      1999-05-07  
   last obs. used      2020-07-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53002  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 23:31:36  

Additional Information
 Earth MOID = 1.77205 au 
 Jupiter MOID = 1.92294 au 
 T_jup = 3.208 
[ 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 13.7   n/a MPO385134  
diameter diameter 4.981 km 0.660 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.311   0.119 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

49643 (1999 JH31)          Discovered 1999-May-10 by LINEAR at Socorro
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 JH31 = 2001 QP260 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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