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JPL Small-Body Database Browser
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20439 (1999 JM28)
Classification: Main-belt Asteroid          SPK-ID: 2020439
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1933268069771113 2.7677e-08  
a 2.400293828060733 6.7962e-09 au
q 1.936252686474884 6.7896e-08 au
i 1.390437909265073 3.2664e-06 deg
node 238.8673133692807 0.00016349 deg
peri 185.7860281335034 0.00016383 deg
M 281.7802518454137 1.0525e-05 deg
tp 2458895.627006009527
(2020-Feb-16.12700601)
3.993e-05 TDB
period 1358.297932044673
3.72
5.7688e-06
1.579e-08
d
yr
n .265037582335184 1.1256e-09 deg/d
Q 2.864334969646582 8.1101e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1886  
   data-arc span      17519 days (47.96 yr)  
   first obs. used      1971-12-16  
   last obs. used      2019-12-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47253  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 00:44:04  

Additional Information
 Earth MOID = .949437 au 
 Jupiter MOID = 2.44762 au 
 T_jup = 3.500 
[ 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 14.1   n/a MPO400205  
diameter diameter 4.512 km 0.243 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.345   0.077 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20439 (1999 JM28)          Discovered 1999-May-10 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 JM28 = 1971 YD = 1978 SU1 = 1993 TW 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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