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3641 Williams Bay (A922 WC)
Classification: Main-belt Asteroid          SPK-ID: 2003641
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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1273849486914221 3.774e-08  
a 2.991784408643346 1.5586e-08 au
q 2.610676105252517 1.0957e-07 au
i 16.10536585346615 5.3033e-06 deg
node 30.7421421786005 1.2712e-05 deg
peri 293.216421246715 2.3536e-05 deg
M 31.65859270083606 2.0798e-05 deg
tp 2458834.280116533750
(2019-Dec-16.78011653)
0.00010885 TDB
period 1890.139546419877
5.17
1.477e-05
4.044e-08
d
yr
n .1904621278793293 1.4884e-09 deg/d
Q 3.372892712034175 1.7572e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3309  
   data-arc span      35787 days (97.98 yr)  
   first obs. used      1922-11-24  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .34426  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:13:21  

Additional Information
 Earth MOID = 1.64982 au 
 Jupiter MOID = 2.12164 au 
 T_jup = 3.184 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457184.5 (2015-Jun-11.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1300821189539955 3.7881e-08  
q 2.602136985866714 1.105e-07 au
tp 2456947.341477897908
(2014-Oct-16.84147790)
0.0001042 TDB
node 30.80153497305922 1.269e-05 deg
peri 293.8382479267547 2.3203e-05 deg
i 16.12650091270958 5.3088e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3309  
   data-arc span      35787 days (97.98 yr)  
   first obs. used      1922-11-24  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .34426  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:13:21  

Additional Information
 Jupiter MOID = 2.12164 au 
 T_jup = 3.184 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.434962720100275E-15 -4.157147348013567E-15 1.57154132466251E-12 -2.162041600726722E-15 2.711840258647427E-13 8.141345470619777E-16
q -4.157147348013567E-15 1.220975567502766E-14 -4.568702792285925E-12 5.597317185684572E-15 -7.832832179125873E-13 -1.787615249960638E-15
tp 1.57154132466251E-12 -4.568702792285925E-12 1.085808903704038E-8 -1.793257046101232E-11 2.0342546196043E-9 8.182111095915175E-13
node -2.162041600726722E-15 5.597317185684572E-15 -1.793257046101232E-11 1.610390610589559E-10 -1.575774273953103E-10 -7.737091217004118E-12
peri 2.711840258647427E-13 -7.832832179125873E-13 2.0342546196043E-9 -1.575774273953103E-10 5.383950049444879E-10 7.527378994559869E-12
i 8.141345470619777E-16 -1.787615249960638E-15 8.182111095915175E-13 -7.737091217004118E-12 7.527378994559869E-12 2.818307616590754E-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 11.5   n/a MPO347550  
diameter diameter 29.710 km 0.401 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 9.03523 h n/a LCDB (Rev. 2020-October); 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.060   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

3641 Williams Bay (A922 WC)          Discovered 1922-Nov-24 by Van Biesbroeck, G. at Williams Bay
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A922 WC = 1977 LJ = 1978 RQ4 = 1982 HZ1 = 1987 FK 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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