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120898 (1998 SL21)
Classification: 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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0668111332866165 5.7362e-08  
a 3.198876807324783 2.7435e-08 au
q 2.985156222583141 1.9837e-07 au
i 2.254793486405232 3.933e-06 deg
node 272.6205372870118 0.00011855 deg
peri 102.5296074626431 0.00012244 deg
M 327.0768616616568 3.1114e-05 deg
tp 2459391.614406349064
(2021-Jun-26.11440635)
0.00018132 TDB
period 2089.751759951
5.72
2.6884e-05
7.36e-08
d
yr
n .1722692651343628 2.2162e-09 deg/d
Q 3.412597392066426 2.9268e-08 au
  Orbit Determination Parameters
   # obs. used (total)      541  
   data-arc span      10293 days (28.18 yr)  
   first obs. used      1992-09-29  
   last obs. used      2020-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55019  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 09:26:08  

Additional Information
 Earth MOID = 1.98557 au 
 Jupiter MOID = 1.98187 au 
 T_jup = 3.190 
[ 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 15.16   n/a E2021B55  

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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