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193844 (2001 QR81)
Classification: Main-belt Asteroid          SPK-ID: 2193844
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2507500567963458 3.8084e-08  
a 2.335237093943313 6.3744e-09 au
q 1.749676260004094 8.7249e-08 au
i 6.94039030737633 4.6641e-06 deg
node 223.3545561550261 3.3145e-05 deg
peri 144.3621008988412 3.444e-05 deg
M 88.64180788356467 9.7467e-06 deg
tp 2458679.554713400439
(2019-Jul-15.05471340)
3.4654e-05 TDB
period 1303.451564611699
3.57
5.337e-06
1.461e-08
d
yr
n .2761897793319574 1.1309e-09 deg/d
Q 2.920797927882533 7.9728e-09 au
  Orbit Determination Parameters
   # obs. used (total)      528  
   data-arc span      9142 days (25.03 yr)  
   first obs. used      1995-01-20  
   last obs. used      2020-01-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50559  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-24 22:09:53  

Additional Information
 Earth MOID = .754855 au 
 Jupiter MOID = 2.56754 au 
 T_jup = 3.516 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457159.5 (2015-May-17.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2521949131692382 3.8259e-08  
q 1.74570812462722 8.7773e-08 au
tp 2457375.031253387486
(2015-Dec-18.53125339)
3.1892e-05 TDB
node 223.3942032188383 3.3176e-05 deg
peri 144.0777110711277 3.4432e-05 deg
i 6.937366121233592 4.6631e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      528  
   data-arc span      9142 days (25.03 yr)  
   first obs. used      1995-01-20  
   last obs. used      2020-01-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50559  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-24 22:09:53  

Additional Information
 Jupiter MOID = 2.56754 au 
 T_jup = 3.516 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.463755512948241E-15 -3.353861393098878E-15 3.487807748859162E-13 5.185563848293896E-15 6.219347227464282E-14 -1.450582700931257E-15
q -3.353861393098878E-15 7.704170140673047E-15 -7.609636824691913E-13 -1.096222318173054E-14 -1.329551216885445E-13 3.536072212452653E-15
tp 3.487807748859162E-13 -7.609636824691913E-13 1.017071304180828E-9 8.811547720605621E-12 3.038926361542581E-10 6.06140123726931E-13
node 5.185563848293896E-15 -1.096222318173054E-14 8.811547720605621E-12 1.100643285732717E-9 -1.089517870182449E-9 1.924607505643699E-11
peri 6.219347227464282E-14 -1.329551216885445E-13 3.038926361542581E-10 -1.089517870182449E-9 1.185550143894955E-9 -1.888044877793319E-11
i -1.450582700931257E-15 3.536072212452653E-15 6.06140123726931E-13 1.924607505643699E-11 -1.888044877793319E-11 2.174461079903466E-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 16.4   n/a MPO449957  

193844 (2001 QR81)          Discovered 2001-Aug-17 by LINEAR at Socorro
Reference: 20081113/Numbers.arcLast Updated: 2008-11-17
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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