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120813 (1998 HW28)
Classification: Main-belt Asteroid          SPK-ID: 2120813
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1679265157600789 3.8261e-08  
a 2.755483540277182 1.6883e-08 au
q 2.292764790124188 1.0836e-07 au
i 4.430578118458345 5.4644e-06 deg
node 155.3564862898575 5.9598e-05 deg
peri 281.7023463507367 6.2276e-05 deg
M 83.77082594896204 1.9251e-05 deg
tp 2458811.736525181707
(2019-Nov-24.23652518)
8.766e-05 TDB
period 1670.687251189979
4.57
1.5355e-05
4.204e-08
d
yr
n .2154801862189247 1.9804e-09 deg/d
Q 3.218202290430177 1.9719e-08 au
  Orbit Determination Parameters
   # obs. used (total)      429  
   data-arc span      10757 days (29.45 yr)  
   first obs. used      1991-10-02  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .60729  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 17:08:15  

Additional Information
 Earth MOID = 1.31267 au 
 Jupiter MOID = 2.05321 au 
 T_jup = 3.319 
[ 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 16.05   n/a E2021B55  

120813 (1998 HW28)          Discovered 1998-Apr-27 by Spacewatch at Kitt Peak
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

Alternate Designations
 1998 HW28 = 2002 AG41 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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