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129561 Chuhachi (1997 CS21)
Classification: Main-belt Asteroid          SPK-ID: 2129561
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1045544818293356 3.6388e-08  
a 2.581530687711293 1.6434e-08 au
q 2.311620084331111 9.2189e-08 au
i 2.247618215177999 6.952e-06 deg
node 5.440721276225545 0.00011292 deg
peri 247.9530631488287 0.00012109 deg
M 122.8834733223631 3.9613e-05 deg
tp 2458483.363320597678
(2018-Dec-30.86332060)
0.00016763 TDB
period 1515.006042321524
4.15
1.4467e-05
3.961e-08
d
yr
n .2376228146577904 2.2691e-09 deg/d
Q 2.851441291091476 1.8152e-08 au
  Orbit Determination Parameters
   # obs. used (total)      410  
   data-arc span      8235 days (22.55 yr)  
   first obs. used      1997-02-09  
   last obs. used      2019-08-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50652  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 03:24:16  

Additional Information
 Earth MOID = 1.29825 au 
 Jupiter MOID = 2.18265 au 
 T_jup = 3.416 
[ 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 16.3   n/a MPO436627  
diameter diameter 3.596 km 0.374 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.038   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

129561 Chuhachi           Discovered 1997 Feb. 9 by A. Nakamura at Kuma Kogen.
In 1891 a self-taught aviation engineer, Chuhachi Ninomiya (1866-1936) became the first Japanese to fly a propeller-driven model aircraft. A manpowered aircraft, not completed in Ninomiya's time because of the lack of funds, was manufactured in 1991 following his design, and it flew 50 meters.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20091004/MPCPages.arcLast Updated: 2009-10-06

Alternate Designations
 1997 CS21 = 1999 TZ225 = 2001 AF1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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