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8957 Koujounotsuki (1998 FM125)
Classification: Main-belt Asteroid          SPK-ID: 2008957
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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1559534294530222 1.2788e-08  
a 2.267017419537519 5.6488e-09 au
q 1.913468278330902 3.0444e-08 au
i 3.072816899701207 5.6492e-07 deg
node 300.6117226937833 1.3644e-05 deg
peri 154.2122012247781 1.3453e-05 deg
M 312.4239804230907 6.2733e-06 deg
tp 2459365.265513472245
(2021-May-30.76551347)
2.1966e-05 TDB
period 1246.753834757469
3.41
4.6599e-06
1.276e-08
d
yr
n .2887498638173677 1.0792e-09 deg/d
Q 2.620566560744137 6.5298e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2205  
   data-arc span      18773 days (51.40 yr)  
   first obs. used      1969-10-16  
   last obs. used      2021-03-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44845  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 21:01:25  

Additional Information
 Earth MOID = .930569 au 
 Jupiter MOID = 2.54108 au 
 T_jup = 3.597 
[ 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 14.16   n/a E2021B10  
diameter diameter 4.066 km 0.587 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 87.224 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.]
geometric albedo albedo 0.265   0.116 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

8957 Koujounotsuki           Discovered 1998 Mar. 22 by T. Seki at Geisei.
Named for a song composed in 1901 by Rentaro Taki (1879-1903). In English, the song's title is "The Moon over the Ruins of a Castle". The reference is specifically to Oka castle, symbol of Takeda City, in Oita Prefecture.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990728/MPCPages.arcLast Updated: 2010-06-11

[ show close-approach data ]
Alternate Designations
 1998 FM125 = 1969 UH = 1976 YF2 = 1984 BE5 = 1986 TX18 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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