+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   164 Eva (A876 NA) 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 81 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3470002831786518 3.4663e-08   a 2.631054013030775 1.0045e-08 au q 1.718077525450768 9.1824e-08 au i 24.4750187518984 3.9571e-06 deg node 76.80852529932808 1.0145e-05 deg peri 284.0383820099307 1.1795e-05 deg M 228.7770843919994 1.0253e-05 deg tp 2459768.698724988222 (2022-Jul-08.19872499) 4.6474e-05 TDB period 1558.809603094113 4.27 8.9267e-06 2.444e-08 d yr n .2309454594617769 1.3225e-09 deg/d Q 3.544030500610782 1.353e-08 au   Orbit Determination Parameters    # obs. used (total)      2874      data-arc span      45182 days (123.70 yr)      first obs. used      1897-05-07      last obs. used      2021-01-19      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .37204      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:44:03   Additional Information  Earth MOID = .877725 au   Jupiter MOID = 2.4456 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 8.85   n/a E2021B10 IRAS observations used: 20 diameter diameter 100.254 km 0.937 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   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, http://obswww.unige.ch/~behrend/page_cou.html] [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] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   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.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-02 00:06 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin