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11980 Ellis (1995 SP8)
Classification: Main-belt Asteroid          SPK-ID: 2011980
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1069681851461723 2.8288e-08  
a 2.461425478406092 8.532e-09 au
q 2.198131262108443 7.2379e-08 au
i 6.433874730521304 3.7259e-06 deg
node 172.6201612320225 2.7421e-05 deg
peri 91.6801146789317 3.306e-05 deg
M 319.4800332676981 1.7918e-05 deg
tp 2459555.261445257192
(2021-Dec-06.76144526)
7.0318e-05 TDB
period 1410.517453535485
3.86
7.3339e-06
2.008e-08
d
yr
n .2552254841637401 1.327e-09 deg/d
Q 2.724719694703741 9.4446e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1643  
   data-arc span      9981 days (27.33 yr)  
   first obs. used      1994-04-03  
   last obs. used      2021-07-31  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51102  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 13:17:55  

Additional Information
 Earth MOID = 1.19413 au 
 Jupiter MOID = 2.34522 au 
 T_jup = 3.473 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.85   n/a MPO636247  

11980 Ellis           Discovered 1995 Sept. 17 by Spacewatch at Kitt Peak.
Kerry Ellis (b. 1965) wrote a thesis at the University of Western Ontario in electrical engineering and specialized in meteor burst communication.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20020427/MPCPages.arcLast Updated: 2003-10-02

Alternate Designations
 1995 SP8 = 1998 HW90 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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