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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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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet 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. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet is not working, here are some notes that might help.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


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

[ hide close-approach data ]
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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