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164 Eva (A876 NA)
Classification: Main-belt Asteroid          SPK-ID: 2000164
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 86 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3471463530279957 1.7398e-08  
a 2.630873308164233 9.0227e-09 au
q 1.717575233956321 4.5155e-08 au
i 24.47638938117489 4.3186e-07 deg
node 76.80596685051076 2.4888e-06 deg
peri 284.0465076327815 4.1935e-06 deg
M 274.0519571352242 8.3196e-06 deg
tp 2459768.618978437380
3.7383e-05 TDB
period 1558.649013663104
n .2309692540425991 1.1882e-09 deg/d
Q 3.544171382372144 1.2155e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3216  
   data-arc span      45359 days (124.19 yr)  
   first obs. used      1897-04-21  
   last obs. used      2021-06-29  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .36361  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 10:37:17  

Additional Information
 Earth MOID = .877636 au 
 Jupiter MOID = 2.44654 au 
 T_jup = 3.192 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.85   n/a E2021B10 IRAS observations used: 20
diameter diameter 100.254 km 0.937 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 13.66 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Schober, H.J. (1982) Astron. Astrophys. Suppl. Ser. 48, 57-62.]
[Warner, B.D. (2009) Minor Planet Bull. 36, 7-13.]
[Behrend, R. (2016) Observatoire de Geneve web site,]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.029   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.684   0.017 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=5.91, mean=15.99, max.=26.59) deg.
U-B UB 0.326   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=5.91, mean=17.13, max.=26.59) deg.
Tholen spectral type spec_T CX   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B X   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)

164 Eva (A876 NA)          Discovered 1876-Jul-12 by Henry, Paul at Paris
In their cooperative program it will probably never be known which of the Henry brothers discovered which planet. With strict impartiality, these discoveries were announced as having been made alternatively by Prosper and by Paul.
Note: "planet" implies "minor planet"
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2021-Jul-25 11:07 UT
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