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21443 (1998 HN8)
Classification: Main-belt Asteroid          SPK-ID: 2021443
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08404638834813039 2.6878e-08  
a 2.40889665279587 7.1063e-09 au
q 2.206437589224477 6.4623e-08 au
i 3.450493271697572 3.1694e-06 deg
node 126.7689991613838 4.8293e-05 deg
peri 140.130224817979 5.176e-05 deg
M 20.83944299739603 1.8345e-05 deg
tp 2459317.448651057787
(2021-Apr-12.94865106)
6.9592e-05 TDB
period 1365.606826571736
3.74
6.0429e-06
1.654e-08
d
yr
n .2636190688236055 1.1665e-09 deg/d
Q 2.611355716367263 7.7036e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2008  
   data-arc span      10507 days (28.77 yr)  
   first obs. used      1992-11-02  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49412  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:42:41  

Additional Information
 Earth MOID = 1.19169 au 
 Jupiter MOID = 2.43808 au 
 T_jup = 3.514 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457295.5 (2015-Sep-30.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0846146921168863 2.6858e-08  
q 2.204341934890637 6.4583e-08 au
tp 2457950.229073884409
(2017-Jul-15.72907388)
6.9347e-05 TDB
node 126.8024124532062 4.8273e-05 deg
peri 139.7288016479401 5.1704e-05 deg
i 3.451058011913133 3.1708e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2008  
   data-arc span      10507 days (28.77 yr)  
   first obs. used      1992-11-02  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49412  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:42:41  

Additional Information
 Jupiter MOID = 2.43808 au 
 T_jup = 3.514 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.213530185082957E-16 -1.725653410427957E-15 1.491319261480548E-13 -5.326527430671461E-15 4.403779813677812E-14 -2.768054390944302E-16
q -1.725653410427957E-15 4.170954859117764E-15 -3.935739026932858E-13 1.212113346538553E-14 -1.197411732330161E-13 7.028918020114016E-16
tp 1.491319261480548E-13 -3.935739026932858E-13 4.808999121419055E-9 -4.342912842023312E-12 1.29156638980113E-9 -3.454642047947249E-13
node -5.326527430671461E-15 1.212113346538553E-14 -4.342912842023312E-12 2.330246905743917E-9 -2.326735635329728E-9 -1.100102430704078E-12
peri 4.403779813677812E-14 -1.197411732330161E-13 1.29156638980113E-9 -2.326735635329728E-9 2.673300195134562E-9 1.005680221284418E-12
i -2.768054390944302E-16 7.028918020114016E-16 -3.454642047947249E-13 -1.100102430704078E-12 1.005680221284418E-12 1.005422068781017E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.70   n/a MPO636386  
diameter diameter 5.682 km 0.069 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.060   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21443 (1998 HN8)          Discovered 1998-Apr-17 by Spacewatch at Kitt Peak
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1998 HN8 = 1999 RA91 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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