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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09022807020491697 7.2893e-08  
a 2.403077636453827 1.5854e-08 au
q 2.186252578764005 1.7572e-07 au
i 4.752573349057045 6.1408e-06 deg
node 285.1299970153751 9.1102e-05 deg
peri 101.5114024868061 0.00010242 deg
M 344.6523506944512 4.4853e-05 deg
tp 2459058.508214205271
(2020-Jul-28.00821421)
0.00016964 TDB
period 1360.661603490487
3.73
1.3465e-05
3.687e-08
d
yr
n .2645771726610767 2.6182e-09 deg/d
Q 2.619902694143649 1.7284e-08 au
  Orbit Determination Parameters
   # obs. used (total)      290  
   data-arc span      7116 days (19.48 yr)  
   first obs. used      1998-11-17  
   last obs. used      2018-05-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .6271  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 09:50:34  

Additional Information
 Earth MOID = 1.1965 au 
 Jupiter MOID = 2.74746 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 16.5   n/a MPO245021  

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

[ show close-approach data ]
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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