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20449 (1999 JM108)
Classification: Main-belt Asteroid          SPK-ID: 2020449
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 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2237819800886161 4.219e-08  
a 2.36465693811203 6.9307e-09 au
q 1.835489326271036 9.9821e-08 au
i 1.195922183952245 3.4683e-06 deg
node 296.4830608926977 0.000187 deg
peri 68.5656839270368 0.00018714 deg
M 219.906901083534 6.8241e-06 deg
tp 2459717.350430406101
(2022-May-17.85043041)
2.589e-05 TDB
period 1328.160747283797
3.64
5.8392e-06
1.599e-08
d
yr
n .2710515280143846 1.1917e-09 deg/d
Q 2.893824549953024 8.4817e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1621  
   data-arc span      15205 days (41.63 yr)  
   first obs. used      1978-10-04  
   last obs. used      2020-05-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48734  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:21:18  

Additional Information
 Earth MOID = .832471 au 
 Jupiter MOID = 2.5713 au 
 T_jup = 3.514 
[ 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 14.88   n/a E2021B10  
diameter diameter 2.823 km 0.351 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.292   0.068 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

20449 (1999 JM108)          Discovered 1999-May-13 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 JM108 = 1978 TQ3 = 2000 QF7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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