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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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456854.5 (2014-Jul-16.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .169610950311268 4.0457e-08  
q 1.947896973656222 9.5908e-08 au
tp 2456218.951024328807
(2012-Oct-18.45102433)
7.0185e-05 TDB
node 348.6404978895852 4.2743e-05 deg
peri 92.65690778250693 4.786e-05 deg
i 5.98937515976075 6.363e-06 deg
  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
 Jupiter MOID = 2.49957 au 
 T_jup = 3.535 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.636737638968681E-15 -3.863279798801572E-15 5.521932140595991E-13 -3.668981843656673E-16 1.978523598959592E-13 -4.636569719434315E-15
q -3.863279798801572E-15 9.198429029351727E-15 -1.447876098230572E-12 1.760159185932189E-15 -5.020734814671072E-13 1.129863211903198E-14
tp 5.521932140595991E-13 -1.447876098230572E-12 4.925941807581788E-9 -1.163387274773671E-11 1.520790865101557E-9 -7.039135063566647E-13
node -3.668981843656673E-16 1.760159185932189E-15 -1.163387274773671E-11 1.82692343745685E-9 -1.819612627145664E-9 -2.307609929884283E-11
peri 1.978523598959592E-13 -5.020734814671072E-13 1.520790865101557E-9 -1.819612627145664E-9 2.290573906518484E-9 2.267867789013992E-11
i -4.636569719434315E-15 1.129863211903198E-14 -7.039135063566647E-13 -2.307609929884283E-11 2.267867789013992E-11 4.0487398263643E-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 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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