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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0957993565316453 3.9493e-08  
a 2.899443244100303 1.753e-08 au
q 2.621678447015468 1.2022e-07 au
i 3.371638477502288 4.2039e-06 deg
node 147.6844248054821 7.7272e-05 deg
peri 351.0757752955993 8.1458e-05 deg
M 321.5023158765892 2.6412e-05 deg
tp 2459193.342364917647
(2020-Dec-09.84236492)
0.00013311 TDB
period 1803.3098081382
4.94
1.6354e-05
4.477e-08
d
yr
n .199632918523122 1.8104e-09 deg/d
Q 3.177208041185139 1.9209e-08 au
  Orbit Determination Parameters
   # obs. used (total)      666  
   data-arc span      10604 days (29.03 yr)  
   first obs. used      1991-01-14  
   last obs. used      2020-01-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57502  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 23:22:49  

Additional Information
 Earth MOID = 1.63502 au 
 Jupiter MOID = 1.83654 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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