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120991 (1998 XQ21)
Classification: Main-belt Asteroid          SPK-ID: 2120991
[ 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 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09035873378547106 6.2487e-08  
a 2.403458692291118 1.3037e-08 au
q 2.186285208150009 1.4575e-07 au
i 4.752528582202752 5.0905e-06 deg
node 285.1315484937711 6.4617e-05 deg
peri 101.565776411538 7.6676e-05 deg
M 37.51200421666443 3.5887e-05 deg
tp 2459058.685320349266
(2020-Jul-28.18532035)		 0.00013592 TDB
period 1360.98525632987
3.73		 1.1073e-05
3.032e-08		 d
yr
n .2645142541593739 2.1521e-09 deg/d
Q 2.620632176432228 1.4215e-08 au
   Orbit Determination Parameters
   # obs. used (total)      385  
   data-arc span      8096 days (22.17 yr)  
   first obs. used      1998-11-17  
   last obs. used      2021-01-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5998  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 09:26:21  

Additional Information
 Earth MOID = 1.1953 au 
 Jupiter MOID = 2.74678 au 
 T_jup = 3.514 
[ 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 16.57   n/a E2021B55  

120991 (1998 XQ21)          Discovered 1998-Dec-10 by Spacewatch at Kitt Peak
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

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Alternate Designations
 1998 XQ21 = 1998 YQ32 = 2001 SO156 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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