Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456877.5 (2014-Aug-08.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .155901130807961 2.7702e-08  
q 1.914153872991951 6.4596e-08 au
tp 2456869.236267724332
(2014-Jul-30.73626772)
5.1945e-05 TDB
node 300.7002294545596 8.0927e-05 deg
peri 153.7523007900748 8.2419e-05 deg
i 3.070355119898645 3.4643e-06 deg
  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
 Jupiter MOID = 2.54138 au 
 T_jup = 3.597 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.673886889262688E-16 -1.784287279693076E-15 -8.378031007500009E-15 -3.003386383914188E-15 1.607849559681029E-14 -2.447091277666355E-16
q -1.784287279693076E-15 4.172586115343529E-15 3.324233370602161E-14 7.486771148923721E-15 -3.308128746837039E-14 6.475798270416096E-16
tp -8.378031007500009E-15 3.324233370602161E-14 2.698329514578686E-9 -1.176586349671793E-11 8.307159153226965E-10 1.155497000072875E-12
node -3.003386383914188E-15 7.486771148923721E-15 -1.176586349671793E-11 6.54918218057766E-9 -6.543200273738272E-9 1.016647548841171E-10
peri 1.607849559681029E-14 -3.308128746837039E-14 8.307159153226965E-10 -6.543200273738272E-9 6.792841651097594E-9 -1.01166479317568E-10
i -2.447091277666355E-16 6.475798270416096E-16 1.155497000072875E-12 1.016647548841171E-10 -1.01166479317568E-10 1.200106630263931E-11

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

[ 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Nov-25 09:11 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin