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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 ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1935970166809214 1.7659e-08  
a 2.400682193178281 6.3915e-09 au
q 1.935917282579954 4.3885e-08 au
i 1.390330284736149 9.2231e-07 deg
node 238.8600644634453 4.6395e-05 deg
peri 185.742140090145 4.9305e-05 deg
M 80.81727962974514 7.5073e-06 deg
tp 2458895.498369883128
(2020-Feb-15.99836988)
2.8017e-05 TDB
period 1358.627602229529
3.72
5.4257e-06
1.485e-08
d
yr
n .2649732711224433 1.0582e-09 deg/d
Q 2.865447103776607 7.6288e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2264  
   data-arc span      17987 days (49.25 yr)  
   first obs. used      1971-12-16  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46296  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:20:56  

Additional Information
 Earth MOID = .948773 au 
 Jupiter MOID = 2.44746 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 14.13   n/a E2021B10  
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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