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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1709109259786319 2.0179e-08  
a 2.189115060257001 4.3931e-09 au
q 1.814971378234709 4.5259e-08 au
i 1.652503412352782 8.1369e-07 deg
node 101.9547674988982 1.1637e-05 deg
peri 284.1396297053226 1.2413e-05 deg
M 96.67926167830765 5.6153e-06 deg
tp 2458882.789085705551
(2020-Feb-03.28908571)
1.8047e-05 TDB
period 1183.045124264376
3.24
3.5612e-06
9.75e-09
d
yr
n .3042994663655371 9.1599e-10 deg/d
Q 2.563258742279294 5.1439e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2633  
   data-arc span      21707 days (59.43 yr)  
   first obs. used      1961-10-18  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46595  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:45:39  

Additional Information
 Earth MOID = .818732 au 
 Jupiter MOID = 2.88367 au 
 T_jup = 3.655 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457090.5 (2015-Mar-09.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1717403849625034 2.0251e-08  
q 1.812591586987632 4.5434e-08 au
tp 2456516.579505244203
(2013-Aug-12.07950524)
1.6333e-05 TDB
node 101.9680423311626 1.166e-05 deg
peri 283.9443646596068 1.2426e-05 deg
i 1.652324866203737 8.1309e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2633  
   data-arc span      21707 days (59.43 yr)  
   first obs. used      1961-10-18  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46595  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:45:39  

Additional Information
 Jupiter MOID = 2.88367 au 
 T_jup = 3.655 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.101061289813493E-16 -9.173477147637393E-16 -2.202161389792858E-13 -4.993863622545238E-14 2.449168531321909E-15 2.983921647700306E-16
q -9.173477147637393E-16 2.064238755025104E-15 4.829924354047746E-13 1.09417059519923E-13 -3.867753329111217E-15 -6.675635882783729E-16
tp -2.202161389792858E-13 4.829924354047746E-13 2.66772966566737E-10 -4.674256636660074E-12 6.762416474086652E-11 -7.334915670497778E-13
node -4.993863622545238E-14 1.09417059519923E-13 -4.674256636660074E-12 1.359574889322941E-10 -1.372651573004254E-10 5.571569836992404E-12
peri 2.449168531321909E-15 -3.867753329111217E-15 6.762416474086652E-11 -1.372651573004254E-10 1.544058738341596E-10 -5.803728777489071E-12
i 2.983921647700306E-16 -6.675635882783729E-16 -7.334915670497778E-13 5.571569836992404E-12 -5.803728777489071E-12 6.611121552289926E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.02   n/a MPCxxxxx  
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. 2020-October); 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

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 ]
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