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216898 (2009 HJ84)
Classification: Jupiter Trojan          SPK-ID: 2216898
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ 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 .03788041450349937 5.3093e-08  
a 5.109958488308395 1.523e-07 au
q 4.916391142675598 3.3533e-07 au
i 16.3019548118574 6.6865e-06 deg
node 85.9144552897851 2.2929e-05 deg
peri 258.7926587921867 0.00011608 deg
M 255.8414005050832 0.00011856 deg
tp 2460421.222968200636
(2024-Apr-20.72296820)
0.0014201 TDB
period 4219.145329173478
11.55
0.00018863
5.164e-07
d
yr
n .08532533769594594 3.8147e-09 deg/d
Q 5.303525833941193 1.5807e-07 au
  Orbit Determination Parameters
   # obs. used (total)      312  
   data-arc span      7130 days (19.52 yr)  
   first obs. used      2001-10-14  
   last obs. used      2021-04-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55345  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 10:42:06  

Additional Information
 Earth MOID = 3.9503 au 
 Jupiter MOID = .0180799 au 
 T_jup = 2.919 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.22   n/a E2021B55  

216898 (2009 HJ84)          Discovered 2009-Apr-27 by Spacewatch at Kitt Peak
Reference: 20090707/Numbers.arcLast Updated: 2009-07-09

Alternate Designations
 2009 HJ84 = 2006 BK269 = 2008 FX73 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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