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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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1845922794278548 5.8406e-08  
a 2.275069615595608 1.1509e-08 au
q 1.855109329395762 1.3742e-07 au
i 5.414705942507181 5.1648e-06 deg
node 207.3362792113163 4.8478e-05 deg
peri 310.1502327036114 4.9781e-05 deg
M 245.9475803981044 1.3853e-05 deg
tp 2459597.593213430974
(2022-Jan-18.09321343)
5.0066e-05 TDB
period 1253.402227976712
3.43
9.5106e-06
2.604e-08
d
yr
n .2872182544155241 2.1794e-09 deg/d
Q 2.695029901795455 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.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .62377  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 15:34:00  

Additional Information
 Earth MOID = .869091 au 
 Jupiter MOID = 2.30826 au 
 T_jup = 3.581 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457199.5 (2015-Jun-26.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .18382466793581 5.8396e-08  
q 1.85735994494646 1.374e-07 au
tp 2457089.305767874838
(2015-Mar-07.80576787)
4.1192e-05 TDB
node 207.4054362041863 4.845e-05 deg
peri 310.0067389009364 4.9771e-05 deg
i 5.415099518434193 5.1652e-06 deg
  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.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .62377  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 15:34:00  

Additional Information
 Jupiter MOID = 2.30826 au 
 T_jup = 3.581 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.410063403405614E-15 -8.008819547200411E-15 -7.625746266236511E-14 2.361545307630903E-15 7.728664599321021E-14 -6.68898089230635E-15
q -8.008819547200411E-15 1.887987286631579E-14 2.892475846138186E-13 -5.073576878450443E-15 -1.545233556255092E-13 1.583000456012377E-14
tp -7.625746266236511E-14 2.892475846138186E-13 1.696803294234932E-9 2.818295773013556E-12 4.812018675413099E-10 2.514971049770332E-13
node 2.361545307630903E-15 -5.073576878450443E-15 2.818295773013556E-12 2.347440575247454E-9 -2.335738360579353E-9 -5.733206077146584E-11
peri 7.728664599321021E-14 -1.545233556255092E-13 4.812018675413099E-10 -2.335738360579353E-9 2.477165075180591E-9 5.705341693807337E-11
i -6.68898089230635E-15 1.583000456012377E-14 2.514971049770332E-13 -5.733206077146584E-11 5.705341693807337E-11 2.667973379657114E-11

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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