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181874 (1999 HW11)
Classification: TransNeptunian Object          SPK-ID: 2181874
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 6 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2556831034336142 0.00028983  
a 52.84522235788621 0.030105 au
q 39.33359190378245 0.0073457 au
i 17.21407733276777 0.00031089 deg
node 198.4593439429742 0.00035418 deg
peri 325.0398535524664 0.05325 deg
M 45.19651745134021 0.067471 deg
tp 2441584.411122721525
(1972-Sep-23.91112272)
11.297 TDB
period 140315.9436487113
384.16
119.9
0.3283
d
yr
n .002565638591301355 2.1924e-06 deg/d
Q 66.35685281198998 0.037802 au
  Orbit Determination Parameters
   # obs. used (total)      32  
   data-arc span      7354 days (20.13 yr)  
   first obs. used      1999-04-18  
   last obs. used      2019-06-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      4  
   norm. resid. RMS      .23473  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:32:24  

Additional Information
 Earth MOID = 38.3557 au 
 Jupiter MOID = 34.006 au 
 T_jup = 5.984 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.0   n/a MPO446096  

181874 (1999 HW11)          Discovered 1999-Apr-18 by Kitt Peak at Kitt Peak
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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