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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03007910279167926 3.9342e-08  
a 3.166856828842948 2.8349e-08 au
q 3.07160061676165 1.3352e-07 au
i 9.965993896378295 4.2716e-06 deg
node 91.55504440413399 3.1946e-05 deg
peri 170.6199897333869 9.9844e-05 deg
M 19.94953026153194 9.4135e-05 deg
tp 2459282.430051691393
(2021-Mar-08.93005169)
0.0005383 TDB
period 2058.453550171213
5.64
2.764e-05
7.567e-08
d
yr
n .1748885710683425 2.3483e-09 deg/d
Q 3.262113040924247 2.9201e-08 au
  Orbit Determination Parameters
   # obs. used (total)      360  
   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      .58928  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 02:38:24  

Additional Information
 Earth MOID = 2.05609 au 
 Jupiter MOID = 1.79601 au 
 T_jup = 3.179 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457494.5 (2016-Apr-16.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02865690182273387 3.9608e-08  
q 3.076351071825437 1.344e-07 au
tp 2457210.624551955929
(2015-Jul-07.12455196)
0.00056303 TDB
node 91.57290893917445 3.1941e-05 deg
peri 168.2373906138163 0.00010379 deg
i 9.966332546405249 4.2719e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      360  
   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      .58928  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 02:38:24  

Additional Information
 Jupiter MOID = 1.79601 au 
 T_jup = 3.179 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.568806194270451E-15 -5.211471035559542E-15 -3.740278041004124E-12 -1.32207976696954E-15 -6.458857959195308E-13 -1.032386229760801E-15
q -5.211471035559542E-15 1.806346327427411E-14 1.082184765722329E-11 7.943932906526416E-15 1.876341427997964E-12 4.263946488874465E-15
tp -3.740278041004124E-12 1.082184765722329E-11 3.170017723167457E-7 1.227146531348051E-10 5.565259509326611E-8 6.373707038308171E-12
node -1.32207976696954E-15 7.943932906526416E-15 1.227146531348051E-10 1.02024378143775E-9 -9.83033628073464E-10 -1.286883675312471E-11
peri -6.458857959195308E-13 1.876341427997964E-12 5.565259509326611E-8 -9.83033628073464E-10 1.077151285863099E-8 1.379306520249611E-11
i -1.032386229760801E-15 4.263946488874465E-15 6.373707038308171E-12 -1.286883675312471E-11 1.379306520249611E-11 1.824872998589087E-11

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

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