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85144 (1981 EU30)
Classification: Main-belt Asteroid          SPK-ID: 2085144
[ 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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1328046904045277 5.3619e-08  
a 2.346537337397201 9.4913e-09 au
q 2.034906172781501 1.2641e-07 au
i 6.519323482399614 5.6386e-06 deg
node 340.7597722426755 3.5137e-05 deg
peri 3.701515848621926 3.8306e-05 deg
M 166.0674276301761 1.556e-05 deg
tp 2458394.850186133071
(2018-Oct-03.35018613)		 5.6168e-05 TDB
period 1312.924130297514
3.59		 7.9658e-06
2.181e-08		 d
yr
n .2741971083419897 1.6636e-09 deg/d
Q 2.658168502012901 1.0752e-08 au
   Orbit Determination Parameters
   # obs. used (total)      945  
   data-arc span      14283 days (39.10 yr)  
   first obs. used      1981-02-12  
   last obs. used      2020-03-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53821  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 21:01:57  

Additional Information
 Earth MOID = 1.02725 au 
 Jupiter MOID = 2.72718 au 
 T_jup = 3.540 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457277.5 (2015-Sep-12.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1334522769959595 5.3921e-08  
q 2.03304414650346 1.2725e-07 au
tp 2457080.015547478232
(2015-Feb-26.51554748)		 5.4992e-05 TDB
node 340.8273294201028 3.5086e-05 deg
peri 3.195617473487286 3.8198e-05 deg
i 6.526043684121396 5.6427e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      945  
   data-arc span      14283 days (39.10 yr)  
   first obs. used      1981-02-12  
   last obs. used      2020-03-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53821  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 21:01:57  

Additional Information
 Jupiter MOID = 2.72718 au 
 T_jup = 3.540 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.907459605619701E-15 -6.847454252946019E-15 -6.302527776377823E-13 1.114979356450301E-16 -2.540939037588739E-13 1.334429178987664E-15
q -6.847454252946019E-15 1.619364403639411E-14 1.478397450623048E-12 -6.51727140915889E-16 5.994599289005122E-13 -2.898463239840245E-15
tp -6.302527776377823E-13 1.478397450623048E-12 3.024163713460107E-9 -3.873454437497932E-12 8.38601827330678E-10 -4.079388964858337E-12
node 1.114979356450301E-16 -6.51727140915889E-16 -3.873454437497932E-12 1.231007305744298E-9 -1.223426302905535E-9 -5.25784940469421E-11
peri -2.540939037588739E-13 5.994599289005122E-13 8.38601827330678E-10 -1.223426302905535E-9 1.459052345175791E-9 5.108273728675794E-11
i 1.334429178987664E-15 -2.898463239840245E-15 -4.079388964858337E-12 -5.25784940469421E-11 5.108273728675794E-11 3.18396094727989E-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 15.37   n/a E2021B10  

85144 (1981 EU30)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20040830/Numbers.arcLast Updated: 2004-09-06

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