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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 ]

[ 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 .167926507837463 3.902e-08  
a 2.755483544654981 1.7217e-08 au
q 2.292764815597476 1.1097e-07 au
i 4.430577486591271 5.5297e-06 deg
node 155.3564924168189 6.0166e-05 deg
peri 281.7023382413363 6.2863e-05 deg
M 83.77082600325576 1.9258e-05 deg
tp 2458811.736524003263
(2019-Nov-24.23652400)
8.7715e-05 TDB
period 1670.687255171458
4.57
1.5658e-05
4.287e-08
d
yr
n .2154801857054056 2.0196e-09 deg/d
Q 3.218202273712487 2.0108e-08 au
  Orbit Determination Parameters
   # obs. used (total)      425  
   data-arc span      10678 days (29.23 yr)  
   first obs. used      1991-10-02  
   last obs. used      2020-12-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60669  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 09:25:58  

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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