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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1070290799282853 3.0707e-08  
a 2.46188633191033 9.0702e-09 au
q 2.198392902917946 7.7148e-08 au
i 6.433343981587786 3.8995e-06 deg
node 172.6193193856585 3.0785e-05 deg
peri 91.58967324484152 3.5943e-05 deg
M 269.5551109851891 1.8607e-05 deg
tp 2459554.972013403254
(2021-Dec-06.47201340)
7.3343e-05 TDB
period 1410.913609549284
3.86
7.7972e-06
2.135e-08
d
yr
n .2551538220082815 1.4101e-09 deg/d
Q 2.725379760902713 1.0041e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1332  
   data-arc span      9851 days (26.97 yr)  
   first obs. used      1994-04-03  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53892  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 01:05:12  

Additional Information
 Earth MOID = 1.19271 au 
 Jupiter MOID = 2.34553 au 
 T_jup = 3.473 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457148.5 (2015-May-06.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1078272958637629 3.0642e-08  
q 2.19603528526137 7.7056e-08 au
tp 2456733.842345106183
(2014-Mar-17.34234511)
7.1063e-05 TDB
node 172.6517427289049 3.0771e-05 deg
peri 91.68421841511118 3.588e-05 deg
i 6.434732156740083 3.9014e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1332  
   data-arc span      9851 days (26.97 yr)  
   first obs. used      1994-04-03  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53892  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 01:05:12  

Additional Information
 Jupiter MOID = 2.34553 au 
 T_jup = 3.473 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.389226760440191E-16 -2.348477232513988E-15 4.631055416197671E-13 -1.025176574730633E-14 1.225330698179956E-13 -3.771999905826223E-16
q -2.348477232513988E-15 5.937648372462983E-15 -1.136436112205325E-12 2.473119527704453E-14 -2.968067128666752E-13 1.118637827401002E-15
tp 4.631055416197671E-13 -1.136436112205325E-12 5.049987931026493E-9 -1.32855233778657E-11 1.322179885940381E-9 -4.102058378482063E-12
node -1.025176574730633E-14 2.473119527704453E-14 -1.32855233778657E-11 9.468250022069758E-10 -9.440155188529936E-10 -2.407670072751269E-11
peri 1.225330698179956E-13 -2.968067128666752E-13 1.322179885940381E-9 -9.440155188529936E-10 1.287388289416874E-9 2.287863026708475E-11
i -3.771999905826223E-16 1.118637827401002E-15 -4.102058378482063E-12 -2.407670072751269E-11 2.287863026708475E-11 1.522127812631623E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.88   n/a MPCxxxxx  

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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