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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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09577829430013474 3.6964e-08  
a 2.899533360704108 1.3171e-08 au
q 2.621821001149531 1.0896e-07 au
i 3.371864193369348 4.1862e-06 deg
node 147.6814751667093 6.2959e-05 deg
peri 350.9991443413527 6.6867e-05 deg
M 1.493327200075167 2.1023e-05 deg
tp 2459193.019285736780
(2020-Dec-09.51928574)
0.00010531 TDB
period 1803.393880874521
4.94
1.2288e-05
3.364e-08
d
yr
n .1996236118010032 1.3602e-09 deg/d
Q 3.177245720258685 1.4432e-08 au
  Orbit Determination Parameters
   # obs. used (total)      842  
   data-arc span      11024 days (30.18 yr)  
   first obs. used      1991-01-14  
   last obs. used      2021-03-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55477  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 03:11:25  

Additional Information
 Earth MOID = 1.63507 au 
 Jupiter MOID = 1.83588 au 
 T_jup = 3.278 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457311.5 (2015-Oct-16.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09548740488741723 3.7357e-08  
q 2.622208076707471 1.1023e-07 au
tp 2457396.579193359555
(2016-Jan-09.07919336)
0.00010413 TDB
node 147.7162562982107 6.2912e-05 deg
peri 352.3125962891309 6.6764e-05 deg
i 3.372299463611531 4.1889e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      842  
   data-arc span      11024 days (30.18 yr)  
   first obs. used      1991-01-14  
   last obs. used      2021-03-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55477  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 03:11:25  

Additional Information
 Jupiter MOID = 1.83588 au 
 T_jup = 3.278 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.395576566835613E-15 -4.094246691236533E-15 7.901835817650607E-13 -4.601041562933614E-15 1.866165799421842E-13 2.17552656239643E-16
q -4.094246691236533E-15 1.215144908486818E-14 -2.350951599679224E-12 1.477266023037598E-14 -5.566802695465598E-13 -4.734699535794597E-16
tp 7.901835817650607E-13 -2.350951599679224E-12 1.08440235862368E-8 -1.984494235311707E-11 2.341919931238296E-9 9.938000191138844E-13
node -4.601041562933614E-15 1.477266023037598E-14 -1.984494235311707E-11 3.957953472253105E-9 -3.955043635435744E-9 1.74841671679079E-11
peri 1.866165799421842E-13 -5.566802695465598E-13 2.341919931238296E-9 -3.955043635435744E-9 4.457472151512128E-9 -1.723483392311694E-11
i 2.17552656239643E-16 -4.734699535794597E-16 9.938000191138844E-13 1.74841671679079E-11 -1.723483392311694E-11 1.754717773827477E-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

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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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