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18289 Yokoyamakoichi (1976 UB16)
Classification: Main-belt Asteroid          SPK-ID: 2018289
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1786869016159899 4.3767e-08  
a 2.814554288391345 1.4582e-08 au
q 2.311630303168698 1.2329e-07 au
i 12.19767965465216 4.6416e-06 deg
node 37.34493023752898 2.1411e-05 deg
peri 299.5616065197058 2.4324e-05 deg
M 165.0348139760926 1.4266e-05 deg
tp 2458409.846971094682
(2018-Oct-18.34697109)
6.5875e-05 TDB
period 1724.697253557347
4.72
1.3403e-05
3.67e-08
d
yr
n .2087322857721649 1.6222e-09 deg/d
Q 3.317478273613992 1.7188e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2276  
   data-arc span      16220 days (44.41 yr)  
   first obs. used      1976-10-22  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43086  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 02:42:24  

Additional Information
 Earth MOID = 1.33039 au 
 Jupiter MOID = 2.20823 au 
 T_jup = 3.263 
[ 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 13.75   n/a MPCxxxxx  
rotation period rot_per 34.0334 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:
[McNeill, A.; Mommert, M.; Trilling, D.E.; Llama, J.; Skiff, B. (2019) Ap. J. Suppl. Series 245, id.29.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]

18289 Yokoyamakoichi           Discovered 1976 Oct. 22 by H. Kosai and K. Hurukawa at Kiso.
Koichi Yokoyama (b. 1940) is a professor emeritus of the National Astronomical observatory, Japan. He was Director of the International Polar Motion Service (1981-1987) and first chairman of the directing board of the International Earth Rotation Service. He also improved the nutation tables.
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 2017-01-12Last Updated: 2017-01-17

Alternate Designations
 1976 UB16 = 1995 UM49 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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