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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1293909280741356 3.9766e-08  
a 2.383366819123546 7.8485e-09 au
q 2.07498077445605 9.3332e-08 au
i 2.630690909589068 4.443e-06 deg
node 14.11905240880384 6.42e-05 deg
peri 184.9979033577485 6.5574e-05 deg
M 72.51419077272689 1.1805e-05 deg
tp 2458929.789398272192
(2020-Mar-21.28939827)
4.4372e-05 TDB
period 1343.955101525657
3.68
6.6385e-06
1.818e-08
d
yr
n .2678660913532961 1.3231e-09 deg/d
Q 2.691752863791043 8.864e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1117  
   data-arc span      9651 days (26.42 yr)  
   first obs. used      1994-02-08  
   last obs. used      2020-07-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56269  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:56:43  

Additional Information
 Earth MOID = 1.07187 au 
 Jupiter MOID = 2.26451 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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