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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08375475244349156 2.8337e-08  
a 2.408158402444243 8.8395e-09 au
q 2.206463691602811 6.9742e-08 au
i 3.450479381760393 3.2525e-06 deg
node 126.7689981533334 5.595e-05 deg
peri 140.0942615932036 6.0089e-05 deg
M 329.1863245129414 2.3659e-05 deg
tp 2459317.333397484674
(2021-Apr-12.83339748)
8.9942e-05 TDB
period 1364.979101962288
3.74
7.5155e-06
2.058e-08
d
yr
n .263740301578585 1.4521e-09 deg/d
Q 2.609853113285675 9.5799e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1789  
   data-arc span      10066 days (27.56 yr)  
   first obs. used      1992-11-02  
   last obs. used      2020-05-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50849  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 19:13:23  

Additional Information
 Earth MOID = 1.19 au 
 Jupiter MOID = 2.44048 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 14.68   n/a E2021B10  
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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