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164 Eva
Classification: Main-belt Asteroid          SPK-ID: 2000164
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 53 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3445157995244434 4.1767e-08  
a 2.633644682440154 1.236e-08 AU
q 1.726312479005986 1.1284e-07 AU
i 24.46972852424652 5.2092e-06 deg
node 77.10040544041009 1.2245e-05 deg
peri 283.5773916329068 1.3563e-05 deg
M 35.43140037058286 7.8077e-06 deg
tp 2456646.854439408881
(2013-Dec-20.35443941)
3.3528e-05 JED
period 1561.112494405566
4.27
1.099e-05
3.009e-08
d
yr
n .2306047778684132 1.6234e-09 deg/d
Q 3.540976885874323 1.6618e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1089  
   data-arc span      42487 days (116.32 yr)  
   first obs. used      1897-05-07  
   last obs. used      2013-09-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53235  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-16 13:09:31  

Additional Information
 Earth MOID = .886543 AU 
 T_jup = 3.192 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.89 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 20
diameter diameter 104.87 km 1.9 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 20
rotation period rot_per 13.66 h n/a Asteroid Lightcurve DataBase (Rev. 2013-Sep-12) Published Reference List:
[Schober, H.J. (1982) Astron. Astrophys. Suppl. Ser. 48, 57-62.]
[Warner, B.D. (2009) Minor Planet Bul. 36, 7-13.]
geometric albedo albedo 0.0447   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 20
B-V BV .684 mag .017 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=5; phase (min.=5.91, mean=15.99, max.=26.59) deg.
U-B UB .326 mag .021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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 | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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