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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1379763761660006 4.7553e-08  
a 2.783508809574095 3.0717e-08 au
q 2.399450351002923 1.3414e-07 au
i 3.707896505121212 5.3487e-06 deg
node 69.72476276075828 0.00012675 deg
peri 188.2261922493928 0.00013019 deg
M 306.8496252059297 3.2128e-05 deg
tp 2459450.932770264760
(2021-Aug-24.43277026)
0.00015236 TDB
period 1696.240104507629
4.64
2.8078e-05
7.687e-08
d
yr
n .2122341047374881 3.5131e-09 deg/d
Q 3.167567268145267 3.4955e-08 au
  Orbit Determination Parameters
   # obs. used (total)      232  
   data-arc span      6916 days (18.93 yr)  
   first obs. used      2002-03-05  
   last obs. used      2021-02-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .64046  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 03:16:40  

Additional Information
 Earth MOID = 1.38275 au 
 Jupiter MOID = 1.88367 au 
 T_jup = 3.315 
[ show covariance matrix ]

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 16.40   n/a E2021B55  

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

[ show close-approach data ]
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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