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21362 Dickarmstrong (1997 HS3)
Classification: Main-belt Asteroid          SPK-ID: 2021362
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09577829474704611 3.7007e-08  
a 2.899533360400668 1.3242e-08 au
q 2.62182099957932 1.0915e-07 au
i 3.371864217473282 4.1877e-06 deg
node 147.68147392 6.3347e-05 deg
peri 350.9991452384253 6.7248e-05 deg
M 1.493327651342914 2.1103e-05 deg
tp 2459193.019283477362
(2020-Dec-09.51928348)
0.00010571 TDB
period 1803.39388059143
4.94
1.2354e-05
3.382e-08
d
yr
n .1996236118323395 1.3675e-09 deg/d
Q 3.177245721222016 1.451e-08 au
  Orbit Determination Parameters
   # obs. used (total)      826  
   data-arc span      11018 days (30.17 yr)  
   first obs. used      1991-01-14  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55345  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:44:03  

Additional Information
 Earth MOID = 1.63507 au 
 Jupiter MOID = 1.83588 au 
 T_jup = 3.278 
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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 15.4   n/a MPO416934  
diameter diameter 4.141 km 0.337 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.071   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21362 Dickarmstrong           Discovered 1997 Apr. 30 by Spacewatch at Kitt Peak.
Richard Armstrong (1937-1991) studied radiogenic isotope geochemistry, geology of the American Cordillera, geochronology, and Earth's geochemical evolution. Name suggested by R. and P. Jedicke.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2016-06-20Last Updated: 2016-06-21

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Alternate Designations
 1997 HS3 = 1995 YX11 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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