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101554 (1999 AL4)
Classification: Mars-crossing Asteroid          SPK-ID: 2101554
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 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3329960442360795 5.4953e-08  
a 2.346740278439288 1.0175e-08 au
q 1.565285048869529 1.2528e-07 au
i 21.86505441201146 8.5027e-06 deg
node 310.1466954308487 1.3501e-05 deg
peri 86.13572036315131 1.9757e-05 deg
M 55.58168613937472 9.6852e-06 deg
tp 2458997.766655612764
(2020-May-28.26665561)
3.516e-05 TDB
period 1313.09445698342
3.60
8.5399e-06
2.338e-08
d
yr
n .2741615411484032 1.7831e-09 deg/d
Q 3.128195508009046 1.3563e-08 au
  Orbit Determination Parameters
   # obs. used (total)      554  
   data-arc span      12231 days (33.49 yr)  
   first obs. used      1987-09-16  
   last obs. used      2021-03-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5245  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 15:37:20  

Additional Information
 Earth MOID = .732731 au 
 Jupiter MOID = 2.77157 au 
 T_jup = 3.393 
[ 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 15.9   n/a MPO532320  

101554 (1999 AL4)          Discovered 1999-Jan-09 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

[ show close-approach data ]
Alternate Designations
 1999 AL4 = 2003 AY 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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