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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 63 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05886828360698748 2.8382e-08  
a 2.868768226901062 1.2327e-08 au
q 2.699888765317136 8.6082e-08 au
i 1.712182191174567 3.64e-06 deg
node 352.4145842328147 0.00010757 deg
peri 58.84882365230976 0.00011277 deg
M 337.9422629009547 3.4563e-05 deg
tp 2459109.242690878497
(2020-Sep-16.74269088)
0.00017059 TDB
period 1774.768125147042
4.86
1.1439e-05
3.132e-08
d
yr
n .2028433995963127 1.3074e-09 deg/d
Q 3.037647688484988 1.3053e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2378  
   data-arc span      12086 days (33.09 yr)  
   first obs. used      1986-12-04  
   last obs. used      2020-01-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49205  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 19:00:17  

Additional Information
 Earth MOID = 1.71077 au 
 Jupiter MOID = 2.18127 au 
 T_jup = 3.296 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456631.5 (2013-Dec-05.0) TDB
Reference: JPL 63 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0589405399604337 2.8452e-08  
q 2.701120585659314 8.6477e-08 au
tp 2457315.725597436792
(2015-Oct-20.22559744)
0.00016709 TDB
node 352.7021733466208 0.00010708 deg
peri 55.13636548883567 0.00011232 deg
i 1.718038916728085 3.6432e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2378  
   data-arc span      12086 days (33.09 yr)  
   first obs. used      1986-12-04  
   last obs. used      2020-01-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49205  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 19:00:17  

Additional Information
 Jupiter MOID = 2.18127 au 
 T_jup = 3.296 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.095406138060964E-16 -2.44034867153488E-15 -6.22692182376356E-13 -1.339266901743546E-17 -1.05216467184734E-13 -6.085346365805521E-17
q -2.44034867153488E-15 7.478218611403823E-15 2.267570019276429E-12 -2.334456464425015E-15 3.88927066436858E-13 2.645215196281026E-16
tp -6.22692182376356E-13 2.267570019276429E-12 2.791816259975969E-8 2.764067829490066E-12 5.676220753797815E-9 1.001229512633775E-12
node -1.339266901743546E-17 -2.334456464425015E-15 2.764067829490066E-12 1.146595083614069E-8 -1.145982183541836E-8 -8.205565889983952E-11
peri -1.05216467184734E-13 3.88927066436858E-13 5.676220753797815E-9 -1.145982183541836E-8 1.26161153621767E-8 8.221379931545094E-11
i -6.085346365805521E-17 2.645215196281026E-16 1.001229512633775E-12 -8.205565889983952E-11 8.221379931545094E-11 1.327317895292819E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.4   n/a MPO431599  
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. 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 0.262   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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