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181598 (2006 WQ21)
Classification: Main-belt Asteroid          SPK-ID: 2181598
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02960194257560106 3.9333e-08  
a 3.165269660932514 2.8708e-08 au
q 3.071571530193298 1.3364e-07 au
i 9.968031741120177 4.274e-06 deg
node 91.55469991870858 3.1941e-05 deg
peri 170.3085749698179 0.00010126 deg
M 345.9554327140549 9.5632e-05 deg
tp 2459280.745439833793
(2021-Mar-07.24543983)
0.00054638 TDB
period 2056.906257914771
5.63
2.7984e-05
7.662e-08
d
yr
n .1750201296800745 2.3811e-09 deg/d
Q 3.258967791671731 2.9558e-08 au
  Orbit Determination Parameters
   # obs. used (total)      359  
   data-arc span      6728 days (18.42 yr)  
   first obs. used      2001-12-24  
   last obs. used      2020-05-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .57993  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:31:15  

Additional Information
 Earth MOID = 2.05437 au 
 Jupiter MOID = 1.79978 au 
 T_jup = 3.180 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.34   n/a E2021B55  
diameter diameter 3.904 km 1.540 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.096   0.072 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

181598 (2006 WQ21)          Discovered 2006-Nov-17 by Mt. Lemmon Survey at Mount Lemmon
Reference: 20080321/Numbers.arcLast Updated: 2008-03-26

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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