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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 | 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 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1070290802417694 3.0872e-08  
a 2.46188633205945 9.1075e-09 au
q 2.198392902279344 7.7475e-08 au
i 6.433343874681798 3.9041e-06 deg
node 172.6193212338023 3.0963e-05 deg
peri 91.58967151045158 3.6103e-05 deg
M 269.5551108192594 1.8653e-05 deg
tp 2459554.972014085772
(2021-Dec-06.47201409)		 7.3534e-05 TDB
period 1410.913609677476
3.86		 7.8293e-06
2.144e-08		 d
yr
n .2551538219850989 1.4159e-09 deg/d
Q 2.725379761839557 1.0082e-08 au
   Orbit Determination Parameters
   # obs. used (total)      1317  
   data-arc span      9843 days (26.95 yr)  
   first obs. used      1994-04-03  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54139  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 23:03:51  

Additional Information
 Earth MOID = 1.19271 au 
 Jupiter MOID = 2.34553 au 
 T_jup = 3.473 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457138.5 (2015-Apr-26.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1078209081020615 3.0807e-08  
q 2.196070959461819 7.7385e-08 au
tp 2456733.852012529444
(2014-Mar-17.35201253)		 7.1174e-05 TDB
node 172.6516317552674 3.0948e-05 deg
peri 91.68857333058135 3.6041e-05 deg
i 6.434707948486408 3.906e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      1317  
   data-arc span      9843 days (26.95 yr)  
   first obs. used      1994-04-03  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54139  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 23:03:51  

Additional Information
 Jupiter MOID = 2.34553 au 
 T_jup = 3.473 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.490837762655823E-16 -2.371208650095863E-15 4.75552402840576E-13 -1.05505841665639E-14 1.254605637938859E-13 -3.734094259017173E-16
q -2.371208650095863E-15 5.988511612477687E-15 -1.164237667455684E-12 2.541711101999989E-14 -3.033610263817404E-13 1.108731937051307E-15
tp 4.75552402840576E-13 -1.164237667455684E-12 5.065672958343882E-9 -1.340543131205107E-11 1.325623410981198E-9 -4.111643551422015E-12
node -1.05505841665639E-14 2.541711101999989E-14 -1.340543131205107E-11 9.577812192206092E-10 -9.549194556964598E-10 -2.470229570809861E-11
peri 1.254605637938859E-13 -3.033610263817404E-13 1.325623410981198E-9 -9.549194556964598E-10 1.298944625189795E-9 2.349774544073346E-11
i -3.734094259017173E-16 1.108731937051307E-15 -4.111643551422015E-12 -2.470229570809861E-11 2.349774544073346E-11 1.525693191499943E-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 14.89   n/a E2021B10  

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

[ show close-approach data ]
Alternate Designations
 1995 SP8 = 1998 HW90 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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