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120811 (1998 HT17)
Classification: Main-belt Asteroid          SPK-ID: 2120811
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 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1700780964163789 4.2348e-08  
a 2.57868385147646 1.8617e-08 au
q 2.140106210757688 1.0578e-07 au
i 3.974556193163857 5.2526e-06 deg
node 323.2563742715874 6.6284e-05 deg
peri 254.4320985573814 7.0444e-05 deg
M 158.3997481395255 3.1073e-05 deg
tp 2458535.000760245680
(2019-Feb-20.50076025)
0.00012473 TDB
period 1512.50067708771
4.14
1.6379e-05
4.484e-08
d
yr
n .2380164223748797 2.5775e-09 deg/d
Q 3.017261492195233 2.1783e-08 au
  Orbit Determination Parameters
   # obs. used (total)      411  
   data-arc span      8322 days (22.78 yr)  
   first obs. used      1998-03-25  
   last obs. used      2021-01-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .64479  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 09:25:58  

Additional Information
 Earth MOID = 1.13605 au 
 Jupiter MOID = 1.97944 au 
 T_jup = 3.402 
[ show covariance matrix ]

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 16.15   n/a E2021B55  

120811 (1998 HT17)          Discovered 1998-Apr-18 by LINEAR at Socorro
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

[ show close-approach data ]
Alternate Designations
 1998 HT17 = 2002 CW240 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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