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181796 (1998 HN122)
Classification: Main-belt Asteroid          SPK-ID: 2181796
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 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2113983484473073 3.4489e-08  
a 2.273254771813085 1.178e-08 au
q 1.792692467451839 7.5686e-08 au
i 8.23692920289805 4.3823e-06 deg
node 101.2016702330896 3.388e-05 deg
peri 141.1138398800141 3.626e-05 deg
M 203.5459215040374 1.4954e-05 deg
tp 2459744.570253769512
(2022-Jun-14.07025377)
5.4174e-05 TDB
period 1251.902751528964
3.43
9.7311e-06
2.664e-08
d
yr
n .2875622723572798 2.2352e-09 deg/d
Q 2.753817076174331 1.427e-08 au
  Orbit Determination Parameters
   # obs. used (total)      375  
   data-arc span      9842 days (26.95 yr)  
   first obs. used      1994-01-04  
   last obs. used      2020-12-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5992  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:32:04  

Additional Information
 Earth MOID = .786192 au 
 Jupiter MOID = 2.28775 au 
 T_jup = 3.568 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457601.5 (2016-Aug-01.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2113509742222734 3.449e-08  
q 1.792903353176052 7.5679e-08 au
tp 2457241.106244683083
(2015-Aug-06.60624468)
4.6668e-05 TDB
node 101.2148408111902 3.3899e-05 deg
peri 141.1408085450345 3.6279e-05 deg
i 8.234680646631633 4.3805e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      375  
   data-arc span      9842 days (26.95 yr)  
   first obs. used      1994-01-04  
   last obs. used      2020-12-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5992  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:32:04  

Additional Information
 Jupiter MOID = 2.28775 au 
 T_jup = 3.568 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.189553553217053E-15 -2.592724659096901E-15 -3.338309192579224E-14 8.415206879356269E-15 -3.828707368500304E-14 -1.164496125333138E-15
q -2.592724659096901E-15 5.727251045910418E-15 1.649898787569294E-13 -1.544086877817464E-14 1.129813595772331E-13 2.827955229690727E-15
tp -3.338309192579224E-14 1.649898787569294E-13 2.177857613936313E-9 3.683494464949358E-11 6.268692015174217E-10 2.60807369139534E-12
node 8.415206879356269E-15 -1.544086877817464E-14 3.683494464949358E-11 1.149127833675762E-9 -1.12608475669006E-9 4.797242714231709E-11
peri -3.828707368500304E-14 1.129813595772331E-13 6.268692015174217E-10 -1.12608475669006E-9 1.316156981069518E-9 -4.667905053472893E-11
i -1.164496125333138E-15 2.827955229690727E-15 2.60807369139534E-12 4.797242714231709E-11 -4.667905053472893E-11 1.918895432122844E-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 16.80   n/a MPCxxxxx  

181796 (1998 HN122)          Discovered 1998-Apr-23 by LINEAR at Socorro
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23

[ show close-approach data ]
Alternate Designations
 1998 HN122 = 1994 BU5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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