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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 58 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05863730027188919 2.8776e-08  
a 2.86926885100116 1.2701e-08 au
q 2.701022671824227 8.6832e-08 au
i 1.711970438455781 3.6411e-06 deg
node 352.4224576972915 0.00011142 deg
peri 58.57470051309468 0.00011649 deg
M 257.0473950787085 3.4682e-05 deg
tp 2459108.180089372363
0.00017196 TDB
period 1775.232713283713
n .2027903143662189 1.3465e-09 deg/d
Q 3.037515030178094 1.3446e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2260  
   data-arc span      11964 days (32.76 yr)  
   first obs. used      1986-12-04  
   last obs. used      2019-09-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49076  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 01:01:54  

Additional Information
 Earth MOID = 1.71133 au 
 Jupiter MOID = 2.1829 au 
 T_jup = 3.295 
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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] (  
rotation period rot_per 13.467 h n/a LCDB (Rev. 2019-January); 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] (  

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 ]
FirstGov 2019-Oct-20 02:07 UT
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