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JPL Small-Body Database Browser
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164 Eva
Classification: Main-belt Asteroid          SPK-ID: 2000164
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 75 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3467923722280944 3.4808e-08  
a 2.631445925193467 1.0292e-08 au
q 1.718880550405672 9.228e-08 au
i 24.47377859029864 4.4261e-06 deg
node 76.81450164048984 1.0216e-05 deg
peri 284.0296559904127 1.2164e-05 deg
M 182.5899787370565 1.0171e-05 deg
tp 2459768.861771096985
4.6723e-05 TDB
period 1559.157907911776
n .2308938678842082 1.3546e-09 deg/d
Q 3.544011299981262 1.3861e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2292  
   data-arc span      44832 days (122.74 yr)  
   first obs. used      1897-05-07  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41022  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:18:52  

Additional Information
 Earth MOID = .879404 au 
 Jupiter MOID = 2.44442 au 
 T_jup = 3.192 
[ show covariance matrix ]

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 8.8   n/a MPO502154 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. 2019-August); 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          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

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2020-Mar-29 00:51 UT
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