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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09567374486667463 3.6561e-08  
a 2.899062189187907 1.279e-08 au
q 2.62169805294692 1.0737e-07 au
i 3.372090586296074 4.1531e-06 deg
node 147.6823601414865 6.0702e-05 deg
peri 350.9143272463123 6.467e-05 deg
M 40.69893769160046 2.0667e-05 deg
tp 2459192.671317524208
(2020-Dec-09.17131752)
0.00010342 TDB
period 1802.954323951041
4.94
1.1932e-05
3.267e-08
d
yr
n .1996722796676771 1.3214e-09 deg/d
Q 3.176426325428894 1.4014e-08 au
  Orbit Determination Parameters
   # obs. used (total)      869  
   data-arc span      11127 days (30.46 yr)  
   first obs. used      1991-01-14  
   last obs. used      2021-07-02  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55564  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:59:44  

Additional Information
 Earth MOID = 1.63574 au 
 Jupiter MOID = 1.83635 au 
 T_jup = 3.278 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457446.5 (2016-Feb-28.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09585926197312462 3.6931e-08  
q 2.622213689794557 1.087e-07 au
tp 2457396.252317746129
(2016-Jan-08.75231775)
0.00010229 TDB
node 147.7160622341287 6.0655e-05 deg
peri 352.2340555727982 6.4528e-05 deg
i 3.372372769796091 4.1552e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      869  
   data-arc span      11127 days (30.46 yr)  
   first obs. used      1991-01-14  
   last obs. used      2021-07-02  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55564  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:59:44  

Additional Information
 Jupiter MOID = 1.83635 au 
 T_jup = 3.278 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.36386654645006E-15 -3.991823657258781E-15 8.738097279476347E-13 -9.844452158078787E-16 1.973529227752957E-13 1.30347044429724E-16
q -3.991823657258781E-15 1.181647408809438E-14 -2.649978947674115E-12 3.777282488321859E-15 -5.974723836456416E-13 -2.211617237098245E-16
tp 8.738097279476347E-13 -2.649978947674115E-12 1.046386759924168E-8 -1.411101755193329E-11 2.265999484971414E-9 7.474195425732808E-13
node -9.844452158078787E-16 3.777282488321859E-15 -1.411101755193329E-11 3.67901480053044E-9 -3.675297498856959E-9 2.566672170543394E-11
peri 1.973529227752957E-13 -5.974723836456416E-13 2.265999484971414E-9 -3.675297498856959E-9 4.163821581896911E-9 -2.54550506520523E-11
i 1.30347044429724E-16 -2.211617237098245E-16 7.474195425732808E-13 2.566672170543394E-11 -2.54550506520523E-11 1.726570105780477E-11

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 15.49   n/a MPCxxxxx  
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

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