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21966 Hamadori (1999 WJ9)
Classification: Main-belt Asteroid          SPK-ID: 2021966
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .308920974208697 2.6009e-08  
a 2.411747192051395 6.2977e-09 au
q 1.666707899937789 6.2637e-08 au
i 6.59942113010648 2.8976e-06 deg
node 117.5440558756101 2.5351e-05 deg
peri 230.494339620937 2.5673e-05 deg
M 286.7094660157201 4.941e-06 deg
tp 2459675.010443173664
(2022-Apr-05.51044317)
1.9455e-05 TDB
period 1368.031505460508
3.75
5.3585e-06
1.467e-08
d
yr
n .2631518342692089 1.0307e-09 deg/d
Q 3.156786484165002 8.2432e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2068  
   data-arc span      11914 days (32.62 yr)  
   first obs. used      1988-11-12  
   last obs. used      2021-06-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48975  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 05:13:04  

Additional Information
 Earth MOID = .6683 au 
 Jupiter MOID = 2.28726 au 
 T_jup = 3.444 
[ 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 14.47   n/a MPO614063  
diameter diameter 3.067 km 0.522 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
rotation period rot_per 4.01324 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.346   0.189 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  

21966 Hamadori           Discovered 1999 Nov. 27 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Hamadori is a coastal region in Fukushima prefecture, Japan. The area between Abukuma highland and the Pacific coast was seriously damaged during the 2011 Tohoku earthquake.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20120506/MPCPages.arcLast Updated: 2012-05-09

Alternate Designations
 1999 WJ9 = 1988 VN2 = 1998 HO135 = 1999 NE39 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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