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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 
[ 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 16.80   n/a MPCxxxxx  

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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2021-Jan-01 10:39 < 00:01 Psych 0.0165966281519287 0.016594166340974 0.0165990900130492 4.66250924743406 4.6625090910784 2459215.943661849 0.681742334558762 134.016141312105 66.036816919463 27.5548574570501 23905.0006436323 T 18 CATAB v2.0f-lin.ifort 2021-Apr-13 21:32:05 2021-Apr-13 21:32
2127-Jul-21 13:27 00:05 David 0.0450938350340081 0.045085540310018 0.0451021397149831 5.18517539622841 5.18517533161801 2498132.060528104 4.92833754014885 1144.65765827045 59.9063703218114 69.0216161556576 105108.180041445 T 18 CATAB v2.0f-lin.ifort 2021-Apr-13 21:32:05 2021-Apr-13 21:32

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