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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1700780959316882 4.2348e-08  
a 2.578683851827936 1.8617e-08 au
q 2.14010621229925 1.0578e-07 au
i 3.974556211769691 5.2526e-06 deg
node 323.256374493712 6.6284e-05 deg
peri 254.4320984634967 7.0444e-05 deg
M 158.3997478534336 3.1073e-05 deg
tp 2458535.000761311602
(2019-Feb-20.50076131)
0.00012473 TDB
period 1512.500677396942
4.14
1.6379e-05
4.484e-08
d
yr
n .2380164223262171 2.5775e-09 deg/d
Q 3.017261491356623 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.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .6449  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 17:08:15  

Additional Information
 Earth MOID = 1.13605 au 
 Jupiter MOID = 1.97944 au 
 T_jup = 3.402 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457189.5 (2015-Jun-16.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1691070768885158 4.2491e-08  
q 2.143662294649356 1.0609e-07 au
tp 2457021.379745106987
(2014-Dec-29.87974511)
0.00011254 TDB
node 323.3256269453803 6.6321e-05 deg
peri 254.4970994231224 7.0497e-05 deg
i 3.972610158846023 5.2502e-06 deg
  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.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .6449  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 17:08:15  

Additional Information
 Jupiter MOID = 1.97944 au 
 T_jup = 3.402 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.805459377584685E-15 -4.464128408226598E-15 4.489092312244262E-13 -7.518897633131478E-15 8.463233726949243E-14 1.673058115108774E-15
q -4.464128408226598E-15 1.125498720462859E-14 1.154840941220277E-13 1.851846643987531E-14 4.655639234856201E-14 -4.614286484416855E-15
tp 4.489092312244262E-13 1.154840941220277E-13 1.266439275257564E-8 -9.315104390178708E-12 2.712052627743841E-9 -2.913208740983878E-12
node -7.518897633131478E-15 1.851846643987531E-14 -9.315104390178708E-12 4.398435398952403E-9 -4.389415709828976E-9 5.246462141304197E-11
peri 8.463233726949243E-14 4.655639234856201E-14 2.712052627743841E-9 -4.389415709828976E-9 4.969758313333151E-9 -5.301117662843615E-11
i 1.673058115108774E-15 -4.614286484416855E-15 -2.913208740983878E-12 5.246462141304197E-11 -5.301117662843615E-11 2.756458232913155E-11

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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