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109204 (2001 QE81)
Classification: Main-belt Asteroid          SPK-ID: 2109204
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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1846122483514315 3.4594e-08  
a 2.742689161665043 1.3664e-08 au
q 2.236355149000956 9.9223e-08 au
i 9.258473882615297 5.8254e-06 deg
node 322.3276822401793 2.3344e-05 deg
peri 119.6582186026475 2.8735e-05 deg
M 350.6927196570727 1.641e-05 deg
tp 2459043.392721927807
(2020-Jul-12.89272193)
7.573e-05 TDB
period 1659.064659607514
4.54
1.2398e-05
3.394e-08
d
yr
n .2169897344960415 1.6215e-09 deg/d
Q 3.249023174329129 1.6186e-08 au
  Orbit Determination Parameters
   # obs. used (total)      992  
   data-arc span      8596 days (23.53 yr)  
   first obs. used      1996-07-21  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51265  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-24 03:21:25  

Additional Information
 Earth MOID = 1.26916 au 
 Jupiter MOID = 2.02115 au 
 T_jup = 3.306 
[ 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 14.5   n/a MPO502754  
diameter diameter 3.248 km 0.788 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 190.100 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.384   0.218 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

109204 (2001 QE81)          Discovered 2001-Aug-17 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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