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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 
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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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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1977-Jun-12 13:54 00:02 Jupiter 1.90287230639423 1.90287163277996 1.90287298000839 2.240902460238 2.0325813698588 2443307.079033932 1.92722104187775 87.6257981811965 17.8869652307865 -82.8076990991586 2044961.78630154 T 15 CATAB v2.0f-lin.ifort 2020-Nov-11 22:24:18 2020-Nov-11 22:24
2000-Mar-26 10:10 < 00:01 Jupiter 1.88678461457894 1.88678403932288 1.88678518983501 2.38953165193325 2.19363030589227 2451629.923798631 0.805999686643893 86.0414959597997 12.8282959656899 -87.1148187824398 1838749.28768712 T 15 CATAB v2.0f-lin.ifort 2020-Nov-11 22:24:18 2020-Nov-11 22:24
2084-Apr-04 07:17 00:03 Jupiter 1.90615138355533 1.90615063827227 1.9061521288385 2.23765007163946 2.02937244133219 2482319.803279384 3.23248177415 94.192872864129 19.7752673452598 -80.4729856477967 2050676.3380656 T 15 CATAB v2.0f-lin.ifort 2020-Nov-11 22:24:18 2020-Nov-11 22:24
2107-Jan-18 00:23 00:04 Jupiter 1.89378507161347 1.89378403988587 1.89378610334608 2.41216460211739 2.21901090643125 2490642.516169712 4.37556606273887 203.571000564116 11.8635951630286 -87.9443864628029 1766729.23479653 T 15 CATAB v2.0f-lin.ifort 2020-Nov-11 22:24:18 2020-Nov-11 22:24
2191-Jan-26 21:35 00:08 Jupiter 1.90547877264884 1.90547696255289 1.90548058274609 2.22306127607891 2.0131970570369 2521332.399194362 8.35760819366538 147.268298272011 33.088592597833 -67.5588101310445 1634859.16305311 T 15 CATAB v2.0f-lin.ifort 2020-Nov-11 22:24:18 2020-Nov-11 22:24

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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