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120898 (1998 SL21)
Classification: Outer Main-belt Asteroid          SPK-ID: 2120898
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06781775892685737 5.9379e-08  
a 3.202896786265159 2.8615e-08 au
q 2.985683504146623 2.034e-07 au
i 2.256075636204806 4.2916e-06 deg
node 272.6539405103096 0.00013122 deg
peri 101.8646755149766 0.00013472 deg
M 293.3292829812826 3.1388e-05 deg
tp 2459388.244340398726
(2021-Jun-22.74434040)
0.00018426 TDB
period 2093.69223529354
5.73
2.8058e-05
7.682e-08
d
yr
n .1719450423187567 2.3043e-09 deg/d
Q 3.420110068383696 3.0556e-08 au
  Orbit Determination Parameters
   # obs. used (total)      505  
   data-arc span      10165 days (27.83 yr)  
   first obs. used      1992-09-29  
   last obs. used      2020-07-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55605  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 10:11:21  

Additional Information
 Earth MOID = 1.98739 au 
 Jupiter MOID = 1.98283 au 
 T_jup = 3.189 
[ 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 15.1   n/a MPO436584  

120898 (1998 SL21)          Discovered 1998-Sep-21 by Spacewatch at Kitt Peak
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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