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101856 (1999 JA121)
Classification: Main-belt Asteroid          SPK-ID: 2101856
[ 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 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1717189089111745 4.272e-08  
a 3.103774643587987 2.6297e-08 au
q 2.570797848284889 1.3374e-07 au
i 12.78126925412478 5.2995e-06 deg
node 81.86777975036682 2.5498e-05 deg
peri 201.7659022097086 3.0899e-05 deg
M 270.4558330211813 1.8881e-05 deg
tp 2459497.285027144350
(2021-Oct-09.78502714)		 0.00010765 TDB
period 1997.255832580033
5.47		 2.5383e-05
6.949e-08		 d
yr
n .1802473144038619 2.2908e-09 deg/d
Q 3.636751438891086 3.0813e-08 au
   Orbit Determination Parameters
   # obs. used (total)      556  
   data-arc span      7680 days (21.03 yr)  
   first obs. used      1999-05-10  
   last obs. used      2020-05-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5617  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 19:58:09  

Additional Information
 Earth MOID = 1.55908 au 
 Jupiter MOID = 1.52144 au 
 T_jup = 3.160 
[ 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 14.7   n/a MPO436476  
diameter diameter 6.820 km 0.156 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.055   0.002 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

101856 (1999 JA121)          Discovered 1999-May-13 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

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