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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1070290865676636 3.3813e-08  
a 2.461886329379719 9.7686e-09 au
q 2.198392884312789 8.3373e-08 au
i 6.433343099137496 3.9425e-06 deg
node 172.6193406188401 3.3477e-05 deg
peri 91.58965273194866 3.8454e-05 deg
M 269.5551103490011 1.9428e-05 deg
tp 2459554.972015350053
(2021-Dec-06.47201535)
7.6768e-05 TDB
period 1410.913607373834
3.86
8.3976e-06
2.299e-08
d
yr
n .2551538224016964 1.5187e-09 deg/d
Q 2.725379774446649 1.0814e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1238  
   data-arc span      9787 days (26.80 yr)  
   first obs. used      1994-04-03  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55297  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 19:10:13  

Additional Information
 Earth MOID = 1.19271 au 
 Jupiter MOID = 2.34553 au 
 T_jup = 3.473 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456967.5 (2014-Nov-06.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .107776430450359 3.3759e-08  
q 2.196454715683546 8.3328e-08 au
tp 2456734.039981389768
(2014-Mar-17.53998139)
7.2965e-05 TDB
node 172.651232494294 3.3462e-05 deg
peri 91.75740864720103 3.8394e-05 deg
i 6.434273988260505 3.9444e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1238  
   data-arc span      9787 days (26.80 yr)  
   first obs. used      1994-04-03  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55297  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 19:10:13  

Additional Information
 Jupiter MOID = 2.34553 au 
 T_jup = 3.473 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.139675778599149E-15 -2.797819717698581E-15 6.965190291170942E-13 -1.537346346573469E-14 1.763669286667329E-13 -3.506917270307279E-16
q -2.797819717698581E-15 6.943477831041349E-15 -1.658390123504759E-12 3.630881805462281E-14 -4.172638576979417E-13 1.046676968057572E-15
tp 6.965190291170942E-13 -1.658390123504759E-12 5.323897231914739E-9 -2.205968358038225E-11 1.388047288281762E-9 -3.987549698510987E-12
node -1.537346346573469E-14 3.630881805462281E-14 -2.205968358038225E-11 1.119713110762854E-9 -1.117868905240822E-9 -3.156513740886989E-11
peri 1.763669286667329E-13 -4.172638576979417E-13 1.388047288281762E-9 -1.117868905240822E-9 1.474101473249639E-9 3.035107897672354E-11
i -3.506917270307279E-16 1.046676968057572E-15 -3.987549698510987E-12 -3.156513740886989E-11 3.035107897672354E-11 1.555830500816705E-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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