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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1572431850327477 3.3552e-08  
a 2.217043808050101 7.0718e-09 au
q 1.868428778315171 7.6045e-08 au
i 5.387835439987451 4.0754e-06 deg
node 135.8416247076864 4.3103e-05 deg
peri 306.9606321323818 4.5574e-05 deg
M 59.42272378684546 1.4895e-05 deg
tp 2459001.473964090223
(2020-May-31.97396409)
4.9535e-05 TDB
period 1205.757130631243
3.30
5.7691e-06
1.579e-08
d
yr
n .2985675894875541 1.4285e-09 deg/d
Q 2.565658837785031 8.1838e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1080  
   data-arc span      10995 days (30.10 yr)  
   first obs. used      1991-02-14  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53927  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 03:10:13  

Additional Information
 Earth MOID = .889939 au 
 Jupiter MOID = 2.64669 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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