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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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08404638435598319 2.7225e-08  
a 2.408896654875301 7.4482e-09 au
q 2.206437600745809 6.5816e-08 au
i 3.450493064483653 3.1774e-06 deg
node 126.7689812934069 5.1e-05 deg
peri 140.1302472654887 5.4518e-05 deg
M 20.83943711261749 1.9437e-05 deg
tp 2459317.448673278466
(2021-Apr-12.94867328)
7.3698e-05 TDB
period 1365.606828339985
3.74
6.3336e-06
1.734e-08
d
yr
n .2636190684822598 1.2227e-09 deg/d
Q 2.611355709004793 8.0742e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1910  
   data-arc span      10466 days (28.65 yr)  
   first obs. used      1992-11-02  
   last obs. used      2021-06-29  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50092  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 05:08:06  

Additional Information
 Earth MOID = 1.19169 au 
 Jupiter MOID = 2.43808 au 
 T_jup = 3.514 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.69   n/a MPO614063  
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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