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120906 (1998 SL39)
Classification: Main-belt Asteroid          SPK-ID: 2120906
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1080327874535582 4.8891e-08  
a 3.057212337317457 2.3951e-08 au
q 2.726933166679645 1.5665e-07 au
i 1.388668375526175 5.4492e-06 deg
node 168.6052862590544 0.00017214 deg
peri 339.7599719247822 0.00017369 deg
M 269.1915570976414 2.5101e-05 deg
tp 2459693.004905117702
(2022-Apr-23.50490512)
0.00013907 TDB
period 1952.481070873725
5.35
2.2944e-05
6.282e-08
d
yr
n .1843807888180457 2.1667e-09 deg/d
Q 3.38749150795527 2.6538e-08 au
  Orbit Determination Parameters
   # obs. used (total)      496  
   data-arc span      8121 days (22.23 yr)  
   first obs. used      1998-09-13  
   last obs. used      2020-12-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52499  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 17:08:43  

Additional Information
 Earth MOID = 1.73824 au 
 Jupiter MOID = 1.61219 au 
 T_jup = 3.226 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457479.5 (2016-Apr-01.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1055376629465699 4.9661e-08  
q 2.735432555889799 1.5874e-07 au
tp 2457745.391813888979
(2016-Dec-22.89181389)
0.00013069 TDB
node 168.6194794736029 0.00017212 deg
peri 340.8679908036332 0.00017371 deg
i 1.387757280367088 5.4532e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      496  
   data-arc span      8121 days (22.23 yr)  
   first obs. used      1998-09-13  
   last obs. used      2020-12-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52499  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 17:08:43  

Additional Information
 Jupiter MOID = 1.61219 au 
 T_jup = 3.226 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.466199636047283E-15 -7.816251301588318E-15 8.174552543966207E-13 1.451653979937319E-15 2.340980758615571E-13 6.460395374951192E-17
q -7.816251301588318E-15 2.519857625729589E-14 -1.463048426526414E-12 1.317032700646081E-15 -5.580225570012358E-13 2.220414038449357E-16
tp 8.174552543966207E-13 -1.463048426526414E-12 1.707974091463044E-8 -7.352099024720899E-12 3.070944554341027E-9 1.988323216403244E-12
node 1.451653979937319E-15 1.317032700646081E-15 -7.352099024720899E-12 2.962585798086494E-8 -2.961818630759963E-8 2.016755017052631E-10
peri 2.340980758615571E-13 -5.580225570012358E-13 3.070944554341027E-9 -2.961818630759963E-8 3.017439915861806E-8 -2.012617667893223E-10
i 6.460395374951192E-17 2.220414038449357E-16 1.988323216403244E-12 2.016755017052631E-10 -2.012617667893223E-10 2.973719998074142E-11

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 15.6   n/a MPO453679  

120906 (1998 SL39)          Discovered 1998-Sep-23 by Spacewatch at Kitt Peak
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

[ show close-approach data ]
Alternate Designations
 1998 SL39 = 2004 TU54 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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