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22815 Sewell (1999 RN18)
Classification: Main-belt Asteroid          SPK-ID: 2022815
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1568792850883792 3.3884e-08  
a 2.340683439142841 7.1447e-09 au
q 1.973478694591904 8.1155e-08 au
i 6.225697991332379 3.8122e-06 deg
node 194.5117498973891 3.1732e-05 deg
peri 154.8673256626642 3.392e-05 deg
M 339.1554102139042 1.1888e-05 deg
tp 2459276.236163647473
(2021-Mar-02.73616365)
4.3261e-05 TDB
period 1308.014175039189
3.58
5.9889e-06
1.64e-08
d
yr
n .2752263751187666 1.2602e-09 deg/d
Q 2.707888183693779 8.2656e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1393  
   data-arc span      10811 days (29.60 yr)  
   first obs. used      1991-04-21  
   last obs. used      2020-11-25  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52353  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 04:13:23  

Additional Information
 Earth MOID = .968007 au 
 Jupiter MOID = 2.73037 au 
 T_jup = 3.540 
[ 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 15.22   n/a E2021B10  
diameter diameter 1.766 km 0.191 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.566   0.112 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

22815 Sewell           Discovered 1999 Sept. 7 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Michael T. Sewell (b. 1993) is a finalist in the 2006 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition, for his physical science project. He attends the Everest Academy, Clarkston, Michigan.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20061009/MPCPages.arcLast Updated: 2006-10-14

Alternate Designations
 1999 RN18 = 1992 UN1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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