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56261 (1999 JT87)
Classification: Main-belt Asteroid          SPK-ID: 2056261
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1441568248697332 4.5367e-08  
a 2.690383828434861 1.6944e-08 au
q 2.302546638046814 1.2977e-07 au
i 12.41297579985025 5.2166e-06 deg
node 81.40013380734106 1.8089e-05 deg
peri 69.93376670796302 2.6343e-05 deg
M 326.8206021665268 1.9203e-05 deg
tp 2459149.054493063530
(2020-Oct-26.55449306)
8.6592e-05 TDB
period 1611.832070349316
4.41
1.5227e-05
4.169e-08
d
yr
n .2233483292846883 2.11e-09 deg/d
Q 3.078221018822908 1.9387e-08 au
  Orbit Determination Parameters
   # obs. used (total)      860  
   data-arc span      8169 days (22.37 yr)  
   first obs. used      1997-12-04  
   last obs. used      2020-04-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56038  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 23:00:08  

Additional Information
 Earth MOID = 1.34851 au 
 Jupiter MOID = 2.0613 au 
 T_jup = 3.324 
[ 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 15.0   n/a MPO359126  
diameter diameter 6.356 km 0.812 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.053   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

56261 (1999 JT87)          Discovered 1999-May-12 by LINEAR at Socorro
Reference: 20030318/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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