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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1558344196230583 2.7753e-08  
a 2.267281052883027 6.12e-09 au
q 1.913960625884644 6.4696e-08 au
i 3.07278299197044 3.4678e-06 deg
node 300.6113908903145 8.0817e-05 deg
peri 154.1616405440168 8.2319e-05 deg
M 254.7158979261107 1.5354e-05 deg
tp 2459365.184043759084
(2021-May-30.68404376)
5.3496e-05 TDB
period 1246.971320144162
3.41
5.0489e-06
1.382e-08
d
yr
n .2886995026945613 1.1689e-09 deg/d
Q 2.62060147988141 7.0737e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1935  
   data-arc span      18643 days (51.04 yr)  
   first obs. used      1969-10-16  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45741  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:17:12  

Additional Information
 Earth MOID = .931292 au 
 Jupiter MOID = 2.54138 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 14.1   n/a MPO337333  
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. 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:
[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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1989-Mar-27 06:32 < 00:01 Eunom 0.0437421387129723 0.0437404559595356 0.0437438215019548 3.58940584672428 3.58940575731733 2447612.771879958 0.625365594002147 107.213737200739 31.185633369796 -40.6952477274168 144243.751687152 T 33 CATAB v2.0f-lin.ifort 2020-Nov-13 03:17:17 2020-Nov-13 03:17
2105-Apr-16 15:09 00:01 Eunom 0.0381090730329244 0.0381073193507502 0.0381108283384419 3.85710394745943 3.85710385195926 2490001.131380634 1.23534076671273 434.622421516606 34.1973692552276 79.2958417427093 163642.522773405 T 33 CATAB v2.0f-lin.ifort 2020-Nov-13 03:17:17 2020-Nov-13 03:17
2128-Aug-10 10:21 00:02 Thisb 0.0309937326842718 0.0309828312768486 0.031004634127512 4.61906284139777 4.61906279377145 2498517.931552167 2.19166810825651 545.887912008005 42.9753073790511 5.52885969856151 13391.1219678236 T 33 CATAB v2.0f-lin.ifort 2020-Nov-13 03:17:17 2020-Nov-13 03:17

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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