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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 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1380370203647494 4.7575e-08  
a 2.78410522480396 3.0923e-08 au
q 2.39979563519009 1.3422e-07 au
i 3.707851037697114 5.352e-06 deg
node 69.73007486991462 0.00012704 deg
peri 188.1377175476968 0.0001305 deg
M 264.4976615081005 3.2188e-05 deg
tp 2459450.630457650190
(2021-Aug-24.13045765)
0.00015349 TDB
period 1696.785307176675
4.65
2.827e-05
7.74e-08
d
yr
n .2121659107238578 3.5348e-09 deg/d
Q 3.168414814417829 3.5192e-08 au
  Orbit Determination Parameters
   # obs. used (total)      229  
   data-arc span      6594 days (18.05 yr)  
   first obs. used      2002-03-05  
   last obs. used      2020-03-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .63681  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-11 22:24:18  

Additional Information
 Earth MOID = 1.38477 au 
 Jupiter MOID = 1.88366 au 
 T_jup = 3.315 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457251.5 (2015-Aug-17.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1390737641852952 4.7598e-08  
q 2.397855358868209 1.3467e-07 au
tp 2457751.106001545349
(2016-Dec-28.60600155)
0.00014725 TDB
node 69.80888255827625 0.00012705 deg
peri 187.584605511652 0.00013045 deg
i 3.7077920057267 5.3497e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      229  
   data-arc span      6594 days (18.05 yr)  
   first obs. used      2002-03-05  
   last obs. used      2020-03-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .63681  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-11 22:24:18  

Additional Information
 Jupiter MOID = 1.88366 au 
 T_jup = 3.315 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.265543319803463E-15 -6.283922983041028E-15 -1.24499631608578E-12 -6.966466141203944E-15 -1.925684508635827E-13 -6.803395208370527E-16
q -6.283922983041028E-15 1.813591123178411E-14 3.87722330461107E-12 2.841036391061985E-14 5.715758702351039E-13 2.213029731786762E-15
tp -1.24499631608578E-12 3.87722330461107E-12 2.168243254899657E-8 7.427318478268072E-11 4.459148910281814E-9 6.218952218658597E-12
node -6.966466141203944E-15 2.841036391061985E-14 7.427318478268072E-11 1.614238942628183E-8 -1.609337302990539E-8 -1.367974723600994E-10
peri -1.925684508635827E-13 5.715758702351039E-13 4.459148910281814E-9 -1.609337302990539E-8 1.701637947087412E-8 1.37810823581132E-10
i -6.803395208370527E-16 2.213029731786762E-15 6.218952218658597E-12 -1.367974723600994E-10 1.37810823581132E-10 2.861917047923762E-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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