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187712 (2008 ET54)
Classification: Main-belt Asteroid          SPK-ID: 2187712
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1602275015380904 5.2943e-08  
a 2.421169815332085 1.4735e-08 au
q 2.033231825021986 1.2917e-07 au
i 3.326031955533144 5.8319e-06 deg
node 83.97266256361272 0.00010592 deg
peri 87.93649307002704 0.00010768 deg
M 153.4791059897851 2.2101e-05 deg
tp 2458613.844612558669
(2019-May-10.34461256)
8.1591e-05 TDB
period 1376.056617719258
3.77
1.2562e-05
3.439e-08
d
yr
n .2616171423212812 2.3882e-09 deg/d
Q 2.809107805642185 1.7096e-08 au
  Orbit Determination Parameters
   # obs. used (total)      206  
   data-arc span      7565 days (20.71 yr)  
   first obs. used      1999-12-07  
   last obs. used      2020-08-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .6333  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:56:32  

Additional Information
 Earth MOID = 1.04165 au 
 Jupiter MOID = 2.15914 au 
 T_jup = 3.493 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457340.5 (2015-Nov-14.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1596348174264994 5.281e-08  
q 2.03424929924789 1.2872e-07 au
tp 2457236.226010256936
(2015-Aug-01.72601026)
7.6101e-05 TDB
node 84.00776037855378 0.00010578 deg
peri 87.56718955305931 0.00010757 deg
i 3.328186394053062 5.8355e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      206  
   data-arc span      7565 days (20.71 yr)  
   first obs. used      1999-12-07  
   last obs. used      2020-08-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .6333  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:56:32  

Additional Information
 Jupiter MOID = 2.15914 au 
 T_jup = 3.493 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.78888164387275E-15 -6.766759973170094E-15 -9.489794837760863E-14 -5.182888121663677E-15 -4.725694030680746E-14 -6.147347605731496E-16
q -6.766759973170094E-15 1.656988199743498E-14 6.213329293824065E-13 1.372842939299576E-14 2.122431829044467E-13 1.825663904299493E-15
tp -9.489794837760863E-14 6.213329293824065E-13 5.79142237026636E-9 1.154815662610698E-12 1.526530151425368E-9 -1.115806482192513E-13
node -5.182888121663677E-15 1.372842939299576E-14 1.154815662610698E-12 1.118872205197786E-8 -1.116872772963296E-8 3.487252078408555E-11
peri -4.725694030680746E-14 2.122431829044467E-13 1.526530151425368E-9 -1.116872772963296E-8 1.15706499849328E-8 -3.481711586208964E-11
i -6.147347605731496E-16 1.825663904299493E-15 -1.115806482192513E-13 3.487252078408555E-11 -3.481711586208964E-11 3.405284676035617E-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 17.4   n/a MPO470025  

187712 (2008 ET54)          Discovered 2008-Mar-06 by Spacewatch at Kitt Peak
Reference: 20080520/Numbers.arcLast Updated: 2008-05-22
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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