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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1298872904930493 3.9703e-08  
a 2.383751742688114 7.9358e-09 au
q 2.074132687622271 9.3315e-08 au
i 2.631559031323548 4.4095e-06 deg
node 14.08361698143013 6.3568e-05 deg
peri 185.1483596593798 6.487e-05 deg
M 124.8298364092306 1.147e-05 deg
tp 2458930.371279492642
(2020-Mar-21.87127949)
4.331e-05 TDB
period 1344.280696103197
3.68
6.7129e-06
1.838e-08
d
yr
n .267801212234594 1.3373e-09 deg/d
Q 2.693370797753958 8.9665e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1128  
   data-arc span      10042 days (27.49 yr)  
   first obs. used      1994-02-08  
   last obs. used      2021-08-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56078  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:42:55  

Additional Information
 Earth MOID = 1.07249 au 
 Jupiter MOID = 2.26195 au 
 T_jup = 3.524 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457340.5 (2015-Nov-14.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1299300602393864 3.9599e-08  
q 2.073012406948861 9.3055e-08 au
tp 2457585.698480766825
(2016-Jul-16.19848077)
4.5148e-05 TDB
node 14.14897899025667 6.3609e-05 deg
peri 184.7986017173647 6.4916e-05 deg
i 2.631730449145566 4.4074e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1128  
   data-arc span      10042 days (27.49 yr)  
   first obs. used      1994-02-08  
   last obs. used      2021-08-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56078  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:42:55  

Additional Information
 Jupiter MOID = 2.26195 au 
 T_jup = 3.524 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.568067952089838E-15 -3.675691927542406E-15 -2.910728790648052E-13 5.936639409869202E-15 -9.178275884345713E-14 -5.517362913733715E-16
q -3.675691927542406E-15 8.65920364433264E-15 5.897937930194822E-13 -1.497450405263002E-14 1.88975654548371E-13 1.330755130747754E-15
tp -2.910728790648052E-13 5.897937930194822E-13 2.038329958858238E-9 2.972263628755097E-12 5.901803335322156E-10 3.100516905207746E-13
node 5.936639409869202E-15 -1.497450405263002E-14 2.972263628755097E-12 4.046044133168585E-9 -4.040686280925068E-9 -7.234354370453226E-12
peri -9.178275884345713E-14 1.88975654548371E-13 5.901803335322156E-10 -4.040686280925068E-9 4.214134763352297E-9 7.32259443854461E-12
i -5.517362913733715E-16 1.330755130747754E-15 3.100516905207746E-13 -7.234354370453226E-12 7.32259443854461E-12 1.942520538805904E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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

Alternate Designations
 1998 JL1 = 1994 CW15 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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