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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1843901780828362 3.4731e-08  
a 2.741990219629569 1.3842e-08 au
q 2.236394154730677 9.9435e-08 au
i 9.258679703901882 5.9685e-06 deg
node 322.3317870745931 2.335e-05 deg
peri 119.70305211454 2.8794e-05 deg
M 263.8170277456545 1.6378e-05 deg
tp 2459043.591043792283
(2020-Jul-13.09104379)
7.653e-05 TDB
period 1658.430510375655
4.54
1.2558e-05
3.438e-08
d
yr
n .2170727068440483 1.6438e-09 deg/d
Q 3.24758628452846 1.6395e-08 au
  Orbit Determination Parameters
   # obs. used (total)      946  
   data-arc span      8529 days (23.35 yr)  
   first obs. used      1996-07-21  
   last obs. used      2019-11-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50848  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-04 10:14:08  

Additional Information
 Earth MOID = 1.26916 au 
 Jupiter MOID = 2.02292 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 14.4   n/a MPO453551  
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-January); 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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