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21469 Robschum (1998 HO97)
Classification: Main-belt Asteroid          SPK-ID: 2021469
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1649423724131809 3.862e-08  
a 2.359406023619337 9.7238e-09 au
q 1.970239996597614 9.2609e-08 au
i 2.31768946832948 5.4007e-06 deg
node 5.481297020862491 9.1557e-05 deg
peri 229.0489802214409 9.2846e-05 deg
M 129.3515173421327 1.5636e-05 deg
tp 2458920.867547025497
(2020-Mar-12.36754703)
5.6628e-05 TDB
period 1323.739269466213
3.62
8.1833e-06
2.24e-08
d
yr
n .2719568787478572 1.6812e-09 deg/d
Q 2.74857205064106 1.1328e-08 au
  Orbit Determination Parameters
   # obs. used (total)      842  
   data-arc span      9656 days (26.44 yr)  
   first obs. used      1994-03-04  
   last obs. used      2020-08-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5745  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:45:59  

Additional Information
 Earth MOID = .960338 au 
 Jupiter MOID = 2.25087 au 
 T_jup = 3.533 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456544.5 (2013-Sep-09.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1647957679058369 3.8523e-08  
q 1.97103851305293 9.2347e-08 au
tp 2456272.732277258218
(2012-Dec-11.23227726)
5.4708e-05 TDB
node 5.5459117164762 9.1617e-05 deg
peri 229.2249592331255 9.2909e-05 deg
i 2.317487320311388 5.3967e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      842  
   data-arc span      9656 days (26.44 yr)  
   first obs. used      1994-03-04  
   last obs. used      2020-08-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5745  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:45:59  

Additional Information
 Jupiter MOID = 2.25087 au 
 T_jup = 3.533 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.484005623667311E-15 -3.544112041225879E-15 -7.739774981449239E-13 -1.18831823334713E-15 -1.958917750074105E-13 1.576144684487667E-16
q -3.544112041225879E-15 8.527935538551937E-15 1.813817303660413E-12 1.308992913171215E-15 4.633538813801469E-13 -2.527779661646904E-16
tp -7.739774981449239E-13 1.813817303660413E-12 2.992914115595547E-9 -4.60102257114558E-12 8.516893667536845E-10 -8.078463596826415E-14
node -1.18831823334713E-15 1.308992913171215E-15 -4.60102257114558E-12 8.393707237613543E-9 -8.38785250220833E-9 -5.689459686385864E-11
peri -1.958917750074105E-13 4.633538813801469E-13 8.516893667536845E-10 -8.38785250220833E-9 8.632086219256487E-9 5.684041914540032E-11
i 1.576144684487667E-16 -2.527779661646904E-16 -8.078463596826415E-14 -5.689459686385864E-11 5.684041914540032E-11 2.912388919335399E-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 15.77   n/a E2020-QM5  

21469 Robschum           Discovered 1998 Apr. 21 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Robert Schumacher mentored a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors. He teaches at the Pierson High School, Sag Harbor, New York.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050224/MPCPages.arcLast Updated: 2005-02-28
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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