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181822 (1998 SQ9)
Classification: Main-belt Asteroid          SPK-ID: 2181822
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1761420646490386 5.4677e-08  
a 2.399439898869367 1.147e-08 au
q 1.976797601081236 1.3502e-07 au
i 4.958924341949235 3.8915e-06 deg
node 53.18004357221193 6.4756e-05 deg
peri 264.51743592 6.603e-05 deg
M 30.10755106485523 1.0984e-05 deg
tp 2459086.963324850669
(2020-Aug-25.46332485)
4.1628e-05 TDB
period 1357.573153848135
3.72
9.7345e-06
2.665e-08
d
yr
n .2651790800219901 1.9015e-09 deg/d
Q 2.822082196657498 1.3491e-08 au
  Orbit Determination Parameters
   # obs. used (total)      514  
   data-arc span      8152 days (22.32 yr)  
   first obs. used      1998-09-14  
   last obs. used      2021-01-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51225  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:32:10  

Additional Information
 Earth MOID = .969129 au 
 Jupiter MOID = 2.48157 au 
 T_jup = 3.500 
[ 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 16.39   n/a E2021B55  

181822 (1998 SQ9)          Discovered 1998-Sep-17 by Beijing Schmidt CCD Asteroid Program at Xinglong
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23

Alternate Designations
 1998 SQ9 = 1998 RB16 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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