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181820 (1998 SM2)
Classification: Inner Main-belt Asteroid          SPK-ID: 2181820
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1236306829829561 3.4226e-08  
a 1.971589406212814 7.812e-09 au
q 1.727840461360763 7.0541e-08 au
i 20.44423584269243 7.1721e-06 deg
node 27.02164771646666 9.8135e-06 deg
peri 66.17400333730296 3.3633e-05 deg
M 319.1525484608431 3.2889e-05 deg
tp 2459315.232275265267
(2021-Apr-10.73227527)
9.2728e-05 TDB
period 1011.167589143274
2.77
6.0098e-06
1.645e-08
d
yr
n .3560240694670752 2.116e-09 deg/d
Q 2.215338351064865 8.7778e-09 au
  Orbit Determination Parameters
   # obs. used (total)      621  
   data-arc span      8150 days (22.31 yr)  
   first obs. used      1998-09-18  
   last obs. used      2021-01-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54549  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:32:10  

Additional Information
 Earth MOID = .810039 au 
 Jupiter MOID = 3.02945 au 
 T_jup = 3.784 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.87   n/a MPCxxxxx  

181820 (1998 SM2)          Discovered 1998-Sep-18 by ODAS at Caussols
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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