+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   690 Wratislavia (1909 HZ) Classification: Main-belt Asteroid          SPK-ID: 2000690 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 6 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1824940321647158 5.4782e-08   a 3.144786540181449 1.5486e-08 AU q 2.57088176416641 1.7386e-07 AU i 11.26679674117923 7.7362e-06 deg node 253.1762626729378 3.2094e-05 deg peri 114.9832498970242 3.8178e-05 deg M 201.3707539587302 2.1591e-05 deg tp 2457298.065072308819 (2015-Oct-02.56507231) 0.0001256 JED period 2036.972589197767 5.58 1.5046e-05 4.119e-08 d yr n .1767328642069655 1.3055e-09 deg/d Q 3.718691316196487 1.8312e-08 AU   Orbit Determination Parameters    # obs. used (total)      1060      data-arc span      40501 days (110.89 yr)      first obs. used      1902-06-03      last obs. used      2013-04-22      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .55237      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 12:37:40   Additional Information  Earth MOID = 1.59546 AU   T_jup = 3.154  [ 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 8.02 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6 diameter diameter 134.65 km 3.8 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6 rotation period rot_per 8.64 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List: [Sada, P.V. (2000) Minor Planet Bul. 27, 25-26.] [Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Stephens, R.D.; Durkee, R.I. (2005) Minor Planet Bul. 32, 38-39.] [Michalowski, T.; Kaasalainen, M.; Polinska, M.; Marciniak, A.; et al. (2006) Astron. Astrophys. 459, 663-668.] [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.0604   0.004 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6 B-V BV .675 mag .009 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=5; phase (min.=4.61, mean=12.81, max.=22.23) deg. U-B UB .316 mag .019 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=5; phase (min.=4.61, mean=12.81, max.=22.23) deg. Tholen spectral type spec_T CPF   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo 690 Wratislavia (1909 HZ)          Discovered 1909-Oct-16 by Metcalf, J. H. at Taunton Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1909 HZ = 1942 XH = A902 LA  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-23 07:25 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin