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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1717413091186514 4.2343e-08  
a 3.103099456684806 2.4433e-08 au
q 2.570169093668381 1.3336e-07 au
i 12.78157233882419 5.271e-06 deg
node 81.86380742019051 2.5055e-05 deg
peri 201.8447375625323 3.0256e-05 deg
M 306.4412173055001 1.8037e-05 deg
tp 2459497.543577424610
(2021-Oct-10.04357742)
0.00010143 TDB
period 1996.604151420367
5.47
2.3581e-05
6.456e-08
d
yr
n .1803061461852111 2.1295e-09 deg/d
Q 3.636029819701231 2.8629e-08 au
  Orbit Determination Parameters
   # obs. used (total)      568  
   data-arc span      7953 days (21.77 yr)  
   first obs. used      1999-05-10  
   last obs. used      2021-02-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55665  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 15:39:02  

Additional Information
 Earth MOID = 1.55661 au 
 Jupiter MOID = 1.52171 au 
 T_jup = 3.161 
[ 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 14.77   n/a E2021B55  
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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