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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1716700652105245 4.3971e-08  
a 2.188589064695365 9.1334e-09 AU
q 1.812873837240071 9.4309e-08 AU
i 1.652330469259895 4.7108e-06 deg
node 101.967626747912 0.00015578 deg
peri 283.9611957014114 0.00015654 deg
M 147.306908216875 1.6556e-05 deg
tp 2456516.589129848682
(2013-Aug-12.08912985)
5.2974e-05 JED
period 1182.618760811911
3.24
7.4029e-06
2.027e-08
d
yr
n .3044091738852907 1.9055e-09 deg/d
Q 2.564304292150659 1.0701e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1349  
   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      .50955  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Sep-02 14:13:23  

Additional Information
 Earth MOID = .817657 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. 2015-July); 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., in press.]

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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