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JPL Small-Body Database Browser
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20324 Johnmahoney (1998 HF22)
Classification: Main-belt Asteroid          SPK-ID: 2020324
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04042430884832206 3.2551e-08  
a 2.525437344402376 1.1559e-08 au
q 2.423348285215168 8.2426e-08 au
i .6515645906068939 4.1746e-06 deg
node 30.39395640253235 0.00032101 deg
peri 100.3907936527397 0.00032578 deg
M 148.016782897452 5.6195e-05 deg
tp 2457997.785299641322
(2017-Sep-01.28529964)
0.00022742 TDB
period 1465.896554983558
4.01
1.0064e-05
2.755e-08
d
yr
n .2455834954902652 1.6861e-09 deg/d
Q 2.627526403589584 1.2026e-08 au
  Orbit Determination Parameters
   # obs. used (total)      879  
   data-arc span      14682 days (40.20 yr)  
   first obs. used      1979-08-14  
   last obs. used      2019-10-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58659  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 04:22:50  

Additional Information
 Earth MOID = 1.43826 au 
 Jupiter MOID = 2.37079 au 
 T_jup = 3.452 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.4   n/a MPO435888  
diameter diameter 2.271 km 0.427 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.237   0.067 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20324 Johnmahoney           Discovered 1998 Apr. 20 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
John Mahoney mentored a finalist in the 2004 Intel Science Talent Search, a science competition for high school seniors. He teaches at the Benjamin Banneker High School, Washington, District of Columbia.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040415/MPCPages.arcLast Updated: 2004-04-20

Alternate Designations
 1998 HF22 = 1991 PC23 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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