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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1708014918757551 3.2819e-08  
a 2.188913767290578 4.8133e-09 au
q 1.815044030249968 7.2986e-08 au
i 1.652521988089058 2.8946e-06 deg
node 101.9554257823806 0.00012394 deg
peri 284.1260962564193 0.00012427 deg
M 35.83923957071024 9.1985e-06 deg
tp 2458882.740028577751
(2020-Feb-03.24002858)
3.0118e-05 TDB
period 1182.881953406618
3.24
3.9017e-06
1.068e-08
d
yr
n .3043414424940925 1.0039e-09 deg/d
Q 2.562783504331188 5.6355e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2268  
   data-arc span      21292 days (58.29 yr)  
   first obs. used      1961-10-18  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48497  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 17:17:55  

Additional Information
 Earth MOID = .820061 au 
 Jupiter MOID = 2.88303 au 
 T_jup = 3.655 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456657.5 (2013-Dec-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1711544313292904 3.2939e-08  
q 1.814527315632112 7.3261e-08 au
tp 2456516.641495573030
(2013-Aug-12.14149557)
2.8725e-05 TDB
node 101.9693608477149 0.00012401 deg
peri 284.0646154914903 0.00012433 deg
i 1.652361309634777 2.8933e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2268  
   data-arc span      21292 days (58.29 yr)  
   first obs. used      1961-10-18  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48497  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 17:17:55  

Additional Information
 Jupiter MOID = 2.88303 au 
 T_jup = 3.655 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.084963300738025E-15 -2.409782448896376E-15 -1.775785738454419E-13 4.110688376081149E-15 -4.163067944524508E-14 -3.305857753435971E-16
q -2.409782448896376E-15 5.367223806008527E-15 3.892853402639923E-13 -9.220519403157195E-15 9.098319005807267E-14 7.501670287926705E-16
tp -1.775785738454419E-13 3.892853402639923E-13 8.251128881833791E-10 -8.297404734208831E-12 2.694687579190456E-10 2.848675143983253E-13
node 4.110688376081149E-15 -9.220519403157195E-15 -8.297404734208831E-12 1.537812686775706E-8 -1.537392170242698E-8 9.997642896022976E-12
peri -4.163067944524508E-14 9.098319005807267E-14 2.694687579190456E-10 -1.537392170242698E-8 1.545827242955101E-8 -9.915707516485466E-12
i -3.305857753435971E-16 7.501670287926705E-16 2.848675143983253E-13 9.997642896022976E-12 -9.915707516485466E-12 8.37100785078279E-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 14.0   n/a MPO502198  
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-August); 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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