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8657 Cedrus (1990 QE9)
Classification: Main-belt Asteroid          SPK-ID: 2008657
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 70 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05928462891234544 2.6845e-08  
a 2.870040721325353 1.032e-08 au
q 2.69989142219826 7.9673e-08 au
i 1.71213256258128 3.1152e-06 deg
node 352.41032464033 0.00010417 deg
peri 58.92782463751458 0.00010822 deg
M 58.15971672451461 2.8699e-05 deg
tp 2459109.586953608229
(2020-Sep-17.08695361)
0.00014162 TDB
period 1775.949102198787
4.86
9.579e-06
2.623e-08
d
yr
n .2027085120594318 1.0934e-09 deg/d
Q 3.040190020452447 1.0932e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2804  
   data-arc span      12551 days (34.36 yr)  
   first obs. used      1986-12-04  
   last obs. used      2021-04-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46688  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 15:50:17  

Additional Information
 Earth MOID = 1.71027 au 
 Jupiter MOID = 2.17919 au 
 T_jup = 3.295 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457021.5 (2014-Dec-30.0) TDB
Reference: JPL 70 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05871795119785857 2.6564e-08  
q 2.701646110633144 7.8668e-08 au
tp 2457316.273640261252
(2015-Oct-20.77364026)
0.00014443 TDB
node 352.6937413377715 0.00010366 deg
peri 55.23397566671897 0.0001079 deg
i 1.718166776524377 3.119e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2804  
   data-arc span      12551 days (34.36 yr)  
   first obs. used      1986-12-04  
   last obs. used      2021-04-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46688  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 15:50:17  

Additional Information
 Jupiter MOID = 2.17919 au 
 T_jup = 3.295 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.056544957112954E-16 -2.074388426666934E-15 2.321475511237213E-13 1.279564157577264E-15 5.521282035749259E-14 -1.562634959227651E-16
q -2.074388426666934E-15 6.188612882283929E-15 -7.556369954327041E-13 -6.163951610618794E-15 -1.792843132724543E-13 5.270030201204292E-16
tp 2.321475511237213E-13 -7.556369954327041E-13 2.08594540901041E-8 6.233264523310887E-12 4.340820687110301E-9 3.766541023172183E-13
node 1.279564157577264E-15 -6.163951610618794E-15 6.233264523310887E-12 1.074525944788749E-8 -1.073870169362001E-8 -3.745488183302783E-11
peri 5.521282035749259E-14 -1.792843132724543E-13 4.340820687110301E-9 -1.073870169362001E-8 1.164329891376985E-8 3.750584689860325E-11
i -1.562634959227651E-16 5.270030201204292E-16 3.766541023172183E-13 -3.745488183302783E-11 3.750584689860325E-11 9.728023454055918E-12

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.46   n/a E2021B10  
diameter diameter 5.943 km 0.218 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 13.467 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 0.262   0.036 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

8657 Cedrus           Discovered 1990 Aug. 16 by E. W. Elst at the European Southern Observatory.
Named for Cedrus, belonging to the family Pinaceae. Cedrus libani (cedar of Lebanon) has a fruit that is an ovoid upright cone.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990402/MPCPages.arcLast Updated: 2010-06-11

Alternate Designations
 1990 QE9 = 1986 XB4 = 1995 SX16 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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