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JPL Small-Body Database Browser
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266646 Zaphod (2008 SD209)
Classification: Main-belt Asteroid          SPK-ID: 2266646
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .138037025823848 4.8033e-08  
a 2.78410522929877 3.1409e-08 au
q 2.399795623865746 1.3492e-07 au
i 3.707851173841952 5.4783e-06 deg
node 69.73007225143083 0.00012902 deg
peri 188.1377142069991 0.00013259 deg
M 264.4976661345636 3.2605e-05 deg
tp 2459450.630436934389
(2021-Aug-24.13043693)
0.00015523 TDB
period 1696.785311285749
4.65
2.8714e-05
7.861e-08
d
yr
n .2121659102100595 3.5904e-09 deg/d
Q 3.168414834731796 3.5745e-08 au
  Orbit Determination Parameters
   # obs. used (total)      223  
   data-arc span      6543 days (17.91 yr)  
   first obs. used      2002-03-05  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .64218  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-25 12:48:44  

Additional Information
 Earth MOID = 1.38477 au 
 Jupiter MOID = 1.88366 au 
 T_jup = 3.315 
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Orbital Elements at Epoch 2457181.5 (2015-Jun-08.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1393287720151784 4.8047e-08  
q 2.396639595191963 1.3535e-07 au
tp 2457751.113115486092
(2016-Dec-28.61311549)
0.0001495 TDB
node 69.82583851344558 0.000129 deg
peri 187.6228488485259 0.00013248 deg
i 3.708402324083351 5.4765e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      223  
   data-arc span      6543 days (17.91 yr)  
   first obs. used      2002-03-05  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .64218  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-25 12:48:44  

Additional Information
 Jupiter MOID = 1.88366 au 
 T_jup = 3.315 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.308522809450984E-15 -6.373455876858127E-15 -1.405370107120765E-12 -3.950790747130357E-15 -2.35330581562381E-13 -9.115199434184608E-16
q -6.373455876858127E-15 1.831953241971532E-14 4.193977861264362E-12 2.073350800833655E-14 6.589688496075382E-13 2.838064987409932E-15
tp -1.405370107120765E-12 4.193977861264362E-12 2.235171822351584E-8 7.851890295678179E-11 4.622334696181178E-9 6.306703698523039E-12
node -3.950790747130357E-15 2.073350800833655E-14 7.851890295678179E-11 1.664035427831213E-8 -1.658934358793659E-8 -1.622794452638613E-10
peri -2.35330581562381E-13 6.589688496075382E-13 4.622334696181178E-9 -1.658934358793659E-8 1.755198620036927E-8 1.632625809534787E-10
i -9.115199434184608E-16 2.838064987409932E-15 6.306703698523039E-12 -1.622794452638613E-10 1.632625809534787E-10 2.999163319952494E-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 16.3   n/a MPO418415  

266646 Zaphod           Discovered 2008 Sept. 28 at the Astronomical Research Observatory, Charleston.
Zaphod Beeblebrox is the ex-Galactic President and confidence trickster in Douglas Adams' book The Hitchhiker's Guide to the Galaxy. Name suggested by M. Johnson and M. Kran.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20121029/MPCPages.arcLast Updated: 2013-03-29

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Alternate Designations
 2008 SD209 = 2005 YK60 = 2007 HP17 = 2008 TS156 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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