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120904 (1998 SW31)
Classification: Main-belt Asteroid          SPK-ID: 2120904
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 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0274533931347579 7.2297e-08  
a 3.025670300099526 2.6226e-08 au
q 2.942605383854733 2.1659e-07 au
i .8982786721550913 7.4322e-06 deg
node 207.2499112965673 0.00035694 deg
peri 334.3506890786881 0.00036728 deg
M 214.3323143917578 8.8822e-05 deg
tp 2459778.342286956488
(2022-Jul-17.84228696)
0.00047733 TDB
period 1922.342777226711
5.26
2.4994e-05
6.843e-08
d
yr
n .1872714919861264 2.4348e-09 deg/d
Q 3.108735216344319 2.6946e-08 au
  Orbit Determination Parameters
   # obs. used (total)      325  
   data-arc span      7821 days (21.41 yr)  
   first obs. used      1998-08-26  
   last obs. used      2020-01-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5304  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-24 06:24:18  

Additional Information
 Earth MOID = 1.9441 au 
 Jupiter MOID = 1.85031 au 
 T_jup = 3.244 
[ 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 15.6   n/a MPO493690  

120904 (1998 SW31)          Discovered 1998-Sep-20 by Spacewatch at Kitt Peak
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

[ show close-approach data ]
Alternate Designations
 1998 SW31 = 1999 XX237 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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