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18821 Markhavel (1999 NW9)
Classification: Main-belt Asteroid          SPK-ID: 2018821
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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1016417529728726 2.5994e-08  
a 2.941533829281828 1.2403e-08 au
q 2.642551174444616 7.7716e-08 au
i 2.360779022533698 2.93e-06 deg
node 160.3697565190173 7.5346e-05 deg
peri 231.0036166460447 7.743e-05 deg
M 24.04160673643481 1.6392e-05 deg
tp 2459077.439071928389
(2020-Aug-15.93907193)
8.4147e-05 TDB
period 1842.71935696548
5.05
1.1655e-05
3.191e-08
d
yr
n .1953634440530512 1.2357e-09 deg/d
Q 3.240516484119039 1.3664e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2247  
   data-arc span      13761 days (37.68 yr)  
   first obs. used      1983-07-10  
   last obs. used      2021-03-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50973  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:38:50  

Additional Information
 Earth MOID = 1.64764 au 
 Jupiter MOID = 2.17614 au 
 T_jup = 3.264 
[ 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 13.88   n/a MPCxxxxx  

18821 Markhavel           Discovered 1999 July 13 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Mark Junichi Havel (b. 1984) was awarded third place in the 2003 Intel International Science and Engineering Fair for his gerontology team project. He attends the Keystone School, San Antonio, Texas, U.S.A.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040830/MPCPages.arcLast Updated: 2004-09-06

[ show close-approach data ]
Alternate Designations
 1999 NW9 = 1998 KU31 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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