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181 Eucharis (A878 CB)
Classification: Main-belt Asteroid          SPK-ID: 2000181
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 71 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2067907137538732 3.5032e-08  
a 3.124488676978364 1.137e-08 au
q 2.478373433350113 1.0924e-07 au
i 18.89346266991061 4.4608e-06 deg
node 143.0198639943586 1.1198e-05 deg
peri 318.9291749057308 1.468e-05 deg
M 281.922338172993 1.0944e-05 deg
tp 2459438.013197490082
(2021-Aug-11.51319749)
6.2545e-05 TDB
period 2017.283143614182
5.52
1.1012e-05
3.015e-08
d
yr
n .1784578437288783 9.7414e-10 deg/d
Q 3.770603920606614 1.3722e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2696  
   data-arc span      46727 days (127.93 yr)  
   first obs. used      1892-08-27  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4079  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:11:34  

Additional Information
 Earth MOID = 1.52406 au 
 Jupiter MOID = 1.46386 au 
 T_jup = 3.100 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455246.5 (2010-Feb-19.0) TDB
Reference: JPL 71 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2021872836455557 3.5096e-08  
q 2.49610015625567 1.0897e-07 au
tp 2455393.800204598508
(2010-Jul-16.30020460)
5.6228e-05 TDB
node 143.264684693288 1.1183e-05 deg
peri 318.5189468514652 1.4841e-05 deg
i 18.88788059396829 4.4609e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2696  
   data-arc span      46727 days (127.93 yr)  
   first obs. used      1892-08-27  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4079  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:11:34  

Additional Information
 Jupiter MOID = 1.46386 au 
 T_jup = 3.100 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.231701490001523E-15 -3.81058116318621E-15 3.226237849794487E-13 -4.767172887698419E-15 6.836669559345872E-14 -3.384310433240822E-15
q -3.81058116318621E-15 1.187358146424096E-14 -9.176054433173502E-13 1.831542830331408E-14 -2.047373652609206E-13 1.204364640435359E-14
tp 3.226237849794487E-13 -9.176054433173502E-13 3.161623885315043E-9 -6.300469489034708E-12 5.678951162226073E-10 -9.926691073250198E-12
node -4.767172887698419E-15 1.831542830331408E-14 -6.300469489034708E-12 1.250631158715336E-10 -1.182296894610974E-10 3.190210713378166E-12
peri 6.836669559345872E-14 -2.047373652609206E-13 5.678951162226073E-10 -1.182296894610974E-10 2.202673525264464E-10 -4.378314281142919E-12
i -3.384310433240822E-15 1.204364640435359E-14 -9.926691073250198E-12 3.190210713378166E-12 -4.378314281142919E-12 1.989938897981967E-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 7.9   n/a MPO502154 IRAS observations used: 12
diameter diameter 115.383 km 1.464 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 52.23 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Stephens, R.D. (2008) Minor Planet Bull. 35, 21-22.]
geometric albedo albedo 0.101   0.019 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.815   0.015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=11.97, mean=15.58, max.=19.39) deg.
U-B UB 0.379   0.043 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=11.97, mean=15.58, max.=19.39) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 4 color indices
SMASSII spectral type spec_B Xk   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

181 Eucharis (A878 CB)          Discovered 1878-Feb-02 by Cottenot at Marseille
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A878 CB = A906 GA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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