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22721 (1998 ST50)
Classification: Main-belt Asteroid          SPK-ID: 2022721
[ 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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1771534990968451 3.8197e-08  
a 3.129388584996066 1.7672e-08 au
q 2.575006447130288 1.2272e-07 au
i 3.7855641081738 4.2428e-06 deg
node 9.289728146026361 4.7307e-05 deg
peri 168.5262538220604 4.8236e-05 deg
M 220.1442220611267 1.1989e-05 deg
tp 2459986.035073176033
(2023-Feb-10.53507318)		 7.1966e-05 TDB
period 2022.0303409057
5.54		 1.7128e-05
4.689e-08		 d
yr
n .1780388714833775 1.5081e-09 deg/d
Q 3.683770722861844 2.0803e-08 au
   Orbit Determination Parameters
   # obs. used (total)      1748  
   data-arc span      11740 days (32.14 yr)  
   first obs. used      1989-01-10  
   last obs. used      2021-03-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52891  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 04:10:26  

Additional Information
 Earth MOID = 1.57862 au 
 Jupiter MOID = 1.2771 au 
 T_jup = 3.186 
[ 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 13.59   n/a E2021B10  

22721 (1998 ST50)          Discovered 1998-Sep-26 by Spacewatch at Kitt Peak
Reference: 20010309/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1998 ST50 = 1991 PE24 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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