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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 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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457069.5 (2015-Feb-16.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1654053811461862 3.8152e-08  
q 2.300315762653739 1.0765e-07 au
tp 2457141.549848494454
(2015-Apr-29.04984849)
8.3672e-05 TDB
node 155.3981767905754 5.9543e-05 deg
peri 281.9875732943112 6.2312e-05 deg
i 4.430328780377566 5.466e-06 deg
  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
 Jupiter MOID = 2.05321 au 
 T_jup = 3.319 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.455612522384849E-15 -4.073172523667586E-15 -6.73288504567787E-13 5.48688324083833E-15 -1.371065192639079E-13 -7.690196649080739E-16
q -4.073172523667586E-15 1.1589493869729E-14 2.176722263521123E-12 -1.510570214077912E-14 4.416185930285143E-13 2.36284431761966E-15
tp -6.73288504567787E-13 2.176722263521123E-12 7.001069880885319E-9 -7.598066708025749E-12 1.558170721961692E-9 3.994704935676406E-12
node 5.48688324083833E-15 -1.510570214077912E-14 -7.598066708025749E-12 3.545321691846052E-9 -3.536028624044487E-9 7.025236816553864E-11
peri -1.371065192639079E-13 4.416185930285143E-13 1.558170721961692E-9 -3.536028624044487E-9 3.882828524071088E-9 -6.91959326525861E-11
i -7.690196649080739E-16 2.36284431761966E-15 3.994704935676406E-12 7.025236816553864E-11 -6.91959326525861E-11 2.987680543577638E-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 16.05   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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