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100839 (1998 HW18)
Classification: Main-belt Asteroid          SPK-ID: 2100839
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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1845922788486226 5.8406e-08  
a 2.275069618974626 1.1509e-08 au
q 1.855109333468832 1.3742e-07 au
i 5.41470596761096 5.1648e-06 deg
node 207.3362792892479 4.8478e-05 deg
peri 310.1502328648572 4.9781e-05 deg
M 245.9475795975287 1.3853e-05 deg
tp 2459597.593217102983
(2022-Jan-18.09321710)
5.0066e-05 TDB
period 1253.402230769111
3.43
9.5106e-06
2.604e-08
d
yr
n .2872182537756434 2.1794e-09 deg/d
Q 2.695029904480419 1.3633e-08 au
  Orbit Determination Parameters
   # obs. used (total)      453  
   data-arc span      8325 days (22.79 yr)  
   first obs. used      1998-03-22  
   last obs. used      2021-01-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .62389  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 19:33:02  

Additional Information
 Earth MOID = .869091 au 
 Jupiter MOID = 2.30826 au 
 T_jup = 3.581 
[ 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 16.64   n/a E2021B55  

100839 (1998 HW18)          Discovered 1998-Apr-18 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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