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21444 (1998 HT8)
Classification: Main-belt Asteroid          SPK-ID: 2021444
[ 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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1189242516178678 1.7905e-08  
a 2.268736662840411 7.4777e-09 au
q 1.998928853094096 4.2716e-08 au
i 7.72392906433628 4.2991e-07 deg
node 60.28729806775684 6.4773e-06 deg
peri 322.5872252177085 7.7343e-06 deg
M 53.065753415019 8.5543e-06 deg
tp 2459016.513314931500
(2020-Jun-16.01331493)		 2.935e-05 TDB
period 1248.172359047551
3.42		 6.1709e-06
1.69e-08		 d
yr
n .2884217050557881 1.4259e-09 deg/d
Q 2.538544472586726 8.367e-09 au
   Orbit Determination Parameters
   # obs. used (total)      1787  
   data-arc span      11419 days (31.26 yr)  
   first obs. used      1989-11-20  
   last obs. used      2021-02-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4938  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 02:58:20  

Additional Information
 Earth MOID = 1.00808 au 
 Jupiter MOID = 2.90056 au 
 T_jup = 3.593 
[ 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 14.38   n/a E2021B10  

21444 (1998 HT8)          Discovered 1998-Apr-17 by Spacewatch at Kitt Peak
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1998 HT8 = 1989 WQ6 = 1999 XF 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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