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120725 (1997 SL18)
Classification: Main-belt Asteroid          SPK-ID: 2120725
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1707075479770129 4.0553e-08  
a 2.345084831449856 1.0835e-08 au
q 1.944761150074965 9.627e-08 au
i 5.985354751881934 6.3607e-06 deg
node 348.5551286175898 4.28e-05 deg
peri 92.82320415573 4.7797e-05 deg
M 97.82249920769061 1.8414e-05 deg
tp 2458844.071423102193
(2019-Dec-26.57142310)
6.7025e-05 TDB
period 1311.705269467524
3.59
9.0907e-06
2.489e-08
d
yr
n .2744518973733628 1.9021e-09 deg/d
Q 2.745408512824748 1.2685e-08 au
  Orbit Determination Parameters
   # obs. used (total)      489  
   data-arc span      8225 days (22.52 yr)  
   first obs. used      1997-08-11  
   last obs. used      2020-02-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53138  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 17:07:51  

Additional Information
 Earth MOID = .971032 au 
 Jupiter MOID = 2.49957 au 
 T_jup = 3.535 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.68   n/a E2021B55  

120725 (1997 SL18)          Discovered 1997-Sep-28 by Spacewatch at Kitt Peak
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

Alternate Designations
 1997 SL18 = 2001 TE39 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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