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6649 Yokotatakao (1991 RN)
Classification: Main-belt Asteroid          SPK-ID: 2006649
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 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2548307055683593 1.4533e-08  
a 2.533941442929436 6.1379e-09 au
q 1.888215357158821 3.7188e-08 au
i 7.20325001095217 4.6328e-07 deg
node 325.2899165350358 2.1113e-06 deg
peri 349.1098819507948 5.922e-06 deg
M 116.3647531430145 3.7767e-06 deg
tp 2458724.274945244713
(2019-Aug-28.77494524)
1.4861e-05 TDB
period 1473.307123345151
4.03
5.3531e-06
1.466e-08
d
yr
n .2443482382564053 8.8781e-10 deg/d
Q 3.179667528700051 7.702e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2376  
   data-arc span      23875 days (65.37 yr)  
   first obs. used      1955-11-11  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46136  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 23:00:09  

Additional Information
 Earth MOID = .873126 au 
 Jupiter MOID = 2.13 au 
 T_jup = 3.392 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.14   n/a E2021B10  
diameter diameter 7.411 km 0.092 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 7.55878 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.222   0.042 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

6649 Yokotatakao           Discovered 1991 Sept. 5 by A. Natori and T. Urata at the JCPM Yakiimo Station.
Takao Yokota (b. 1956) is a systems engineer who works on space and astronomical technologies and also an active amateur astronomer. He contributed to the International Space Station project and is a staff member of the Japan Spaceguard Association.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20020526/MPCPages.arcLast Updated: 2003-10-02

Alternate Designations
 1991 RN = 1979 WP4 = 1983 SR = 1987 RB5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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