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4641 Ayako (1990 QT3)
Classification: Main-belt Asteroid          SPK-ID: 2004641
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1707539638952603 3.2943e-08  
a 2.189257038922025 4.8962e-09 au
q 1.815432721540489 7.3213e-08 au
i 1.652499907940105 2.9271e-06 deg
node 101.9552111897677 0.00012434 deg
peri 284.0308495669413 0.00012467 deg
M 274.1886619361526 9.1507e-06 deg
tp 2458882.523781960046
(2020-Feb-03.02378196)
3.0328e-05 TDB
period 1183.160218642377
3.24
3.9691e-06
1.087e-08
d
yr
n .3042698650002648 1.0207e-09 deg/d
Q 2.563081356303561 5.7322e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2135  
   data-arc span      21198 days (58.04 yr)  
   first obs. used      1961-10-18  
   last obs. used      2019-11-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49085  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 02:38:16  

Additional Information
 Earth MOID = .819701 au 
 Jupiter MOID = 2.88074 au 
 T_jup = 3.654 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456577.5 (2013-Oct-12.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1710438684947376 3.3047e-08  
q 1.814487453405774 7.3462e-08 au
tp 2456516.579081351681
(2013-Aug-12.07908135)
2.8873e-05 TDB
node 101.9695749480686 0.00012441 deg
peri 284.0392111664866 0.00012474 deg
i 1.652356970654475 2.926e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2135  
   data-arc span      21198 days (58.04 yr)  
   first obs. used      1961-10-18  
   last obs. used      2019-11-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49085  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 02:38:16  

Additional Information
 Jupiter MOID = 2.88074 au 
 T_jup = 3.654 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.092086844401151E-15 -2.42424949740607E-15 -1.733905225960932E-13 3.979346137381144E-15 -4.06564628884264E-14 -3.260151515251581E-16
q -2.42424949740607E-15 5.396606392889421E-15 3.816419841759959E-13 -8.923612912217145E-15 8.920972273956543E-14 7.39353500840222E-16
tp -1.733905225960932E-13 3.816419841759959E-13 8.336383250756202E-10 -8.326244515195315E-12 2.716736445413627E-10 2.800705105531693E-13
node 3.979346137381144E-15 -8.923612912217145E-15 -8.326244515195315E-12 1.547899490199483E-8 -1.547475947181622E-8 7.723877033536627E-12
peri -4.06564628884264E-14 8.920972273956543E-14 2.716736445413627E-10 -1.547475947181622E-8 1.555965864268611E-8 -7.64419556613223E-12
i -3.260151515251581E-16 7.39353500840222E-16 2.800705105531693E-13 7.723877033536627E-12 -7.64419556613223E-12 8.561330681691073E-12

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 13.9   n/a MPO279563  
diameter diameter 3.548 km 0.717 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 5.3126 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2013) http://www.asu.cas.cz/~ppravec/neo.htm]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
geometric albedo albedo 0.424   0.129 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

4641 Ayako           Discovered 1990 Aug. 30 by K. Endate and K. Watanabe at Kitami.
Ayako Endate (b.~1971) is the wife of the first discoverer of this minor planet.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20110218/MPCPages.arcLast Updated: 2011-02-22

[ show close-approach data ]
Alternate Designations
 1990 QT3 = 1935 SH1 = 1961 UK = 1976 GZ1 = 1977 RX1 = 1984 YO5 = 1984 YR6 = 1987 UU9 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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