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19917 Dazaifu (1977 EE8)
Classification: Outer Main-belt Asteroid          SPK-ID: 2019917
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04660551165071441 4.4484e-08  
a 3.389415325618242 2.3413e-08 au
q 3.231449890171031 1.5421e-07 au
i 1.864008955930319 4.5934e-06 deg
node 308.2633934348593 0.00012922 deg
peri 239.7968170043198 0.00013713 deg
M 323.7382849752642 4.53e-05 deg
tp 2459230.078624691033
(2021-Jan-15.57862469)
0.00028674 TDB
period 2279.216656807147
6.24
2.3616e-05
6.466e-08
d
yr
n .1579490036301806 1.6366e-09 deg/d
Q 3.547380761065453 2.4504e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1553  
   data-arc span      15751 days (43.12 yr)  
   first obs. used      1977-03-12  
   last obs. used      2020-04-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54856  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 05:07:11  

Additional Information
 Earth MOID = 2.2325 au 
 Jupiter MOID = 1.42408 au 
 T_jup = 3.147 
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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 13.4   n/a MPO492963  
rotation period rot_per 5.219 h n/a LCDB (Rev. 2019-August); 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:
[Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

19917 Dazaifu           Discovered 1977 Mar. 12 by H. Kosai and K. Hurukawa at Kiso.
In the second half of the 7th century, the Dazaifu government office was in charge of the Kyushu area and the two islands of Iki and Tsushima, and it was a base of defense and diplomatic relations at that time. The corner stones of the remains of the capital towers 'tofuro' remain in Dazaifu city.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2018-09-25Last Updated: 2018-10-01

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Alternate Designations
 1977 EE8 = 1998 RC20 = 1998 SU5 = 1999 VL163 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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