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21491 (1998 JL1)
Classification: Main-belt Asteroid          SPK-ID: 2021491
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1298872905449134 3.9762e-08  
a 2.383751742577541 8.0273e-09 au
q 2.074132687402428 9.3521e-08 au
i 2.631559467092452 4.4409e-06 deg
node 14.08362391581111 6.4114e-05 deg
peri 185.1483529345339 6.5468e-05 deg
M 124.8298362698714 1.1654e-05 deg
tp 2458930.371280045458
(2020-Mar-21.87128005)
4.405e-05 TDB
period 1344.280696009662
3.68
6.7903e-06
1.859e-08
d
yr
n .2678012122532275 1.3527e-09 deg/d
Q 2.693370797752653 9.0699e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1121  
   data-arc span      9651 days (26.42 yr)  
   first obs. used      1994-02-08  
   last obs. used      2020-07-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56205  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:46:19  

Additional Information
 Earth MOID = 1.07249 au 
 Jupiter MOID = 2.26195 au 
 T_jup = 3.524 
[ 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 15.66   n/a E2020-QM5  

21491 (1998 JL1)          Discovered 1998-May-01 by JPL/GEODSS NEAT at Haleakala
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 JL1 = 1994 CW15 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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