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JPL Small-Body Database Browser
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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 62 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05886828259700785 2.84e-08  
a 2.868768227213 1.2331e-08 au
q 2.699888768508108 8.6141e-08 au
i 1.712182196348011 3.64e-06 deg
node 352.4145866759252 0.00010761 deg
peri 58.84882100196302 0.00011281 deg
M 337.9422629623124 3.4563e-05 deg
tp 2459109.242690593746
(2020-Sep-16.74269059)
0.00017059 TDB
period 1774.768125436513
4.86
1.1443e-05
3.133e-08
d
yr
n .2028433995632281 1.3078e-09 deg/d
Q 3.037647685917892 1.3057e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2375  
   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      .49162  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 21:21:20  

Additional Information
 Earth MOID = 1.71077 au 
 Jupiter MOID = 2.18127 au 
 T_jup = 3.296 
[ show covariance matrix ]

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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