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

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Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1717428328537754 4.3849e-08  
a 2.188808701537221 9.0628e-09 au
q 1.812896494560224 9.4078e-08 au
i 1.652277229677541 4.667e-06 deg
node 101.9681116998154 0.00015526 deg
peri 283.8581211622482 0.00015601 deg
M 330.0722367351789 1.711e-05 deg
tp 2457698.829061890824
(2016-Nov-06.32906189)
5.6557e-05 JED
period 1182.796788636257
3.24
7.3461e-06
2.011e-08
d
yr
n .3043633559532009 1.8903e-09 deg/d
Q 2.564720908514217 1.0619e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1354  
   data-arc span      19657 days (53.82 yr)  
   first obs. used      1961-10-18  
   last obs. used      2015-08-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51117  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Feb-25 18:08:15  

Additional Information
 Earth MOID = .816469 au 
 Jupiter MOID = 2.88006 au 
 T_jup = 3.655 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.9 mag n/a MPO279563  
rotation period rot_per 5.3126 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2013) http://www.asu.cas.cz/~ppravec/neo.htm]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2016) Astron. J. 150, A75.]

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 | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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