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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 | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3087918248181591 3.0366e-08  
a 2.411948001945794 6.9337e-09 au
q 1.66715817705844 7.2292e-08 au
i 6.599402191111154 3.4116e-06 deg
node 117.5444210574081 2.6557e-05 deg
peri 230.4809331062409 2.6951e-05 deg
M 235.1375937699582 4.854e-06 deg
tp 2459675.047333386074
(2022-Apr-05.54733339)
1.9598e-05 TDB
period 1368.202369128167
3.75
5.8998e-06
1.615e-08
d
yr
n .2631189713765777 1.1346e-09 deg/d
Q 3.156737826833149 9.0748e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1828  
   data-arc span      11755 days (32.18 yr)  
   first obs. used      1988-11-12  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50596  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-23 19:30:05  

Additional Information
 Earth MOID = .667772 au 
 Jupiter MOID = 2.28705 au 
 T_jup = 3.444 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.45   n/a E2021B10  
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

[ show close-approach data ]
Alternate Designations
 1999 WJ9 = 1988 VN2 = 1998 HO135 = 1999 NE39 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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