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21166 Nobuyukishouji (1993 XH)
Classification: Main-belt Asteroid          SPK-ID: 2021166
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 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1572829228720863 2.8623e-08  
a 2.216692100923887 6.3442e-09 au
q 1.868044288183113 6.3751e-08 au
i 5.387922354195528 3.6364e-06 deg
node 135.8424542670645 4.2202e-05 deg
peri 306.9013625035515 4.4594e-05 deg
M 118.0059373457751 1.4988e-05 deg
tp 2459001.353767468121
(2020-May-31.85376747)
4.9487e-05 TDB
period 1205.47022388081
3.30
5.1751e-06
1.417e-08
d
yr
n .2986386497719041 1.2821e-09 deg/d
Q 2.565339913664662 7.3421e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1226  
   data-arc span      11067 days (30.30 yr)  
   first obs. used      1991-02-14  
   last obs. used      2021-06-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52235  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:31:02  

Additional Information
 Earth MOID = .88987 au 
 Jupiter MOID = 2.64754 au 
 T_jup = 3.631 
[ 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 15.49   n/a MPCxxxxx  
rotation period rot_per 11.764 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

21166 Nobuyukishouji           Discovered 1993 Dec. 6 by T. Seki at Geisei.
Nobuyuki Maeda (b. 1957) and Shouji Higasioka (b. 1958) are brothers living in Aki city in Kochi prefecture. Nobuyuki, formerly a high school teacher, teaches astronomy at Geisel Observatory. Shouji is a comet hunter and volunteers for astronomy outreach activities.
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 2019-08-27Last Updated: 2019-09-23

Alternate Designations
 1993 XH = 1998 HA140 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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