+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   397 Vienna (1894 BM) Classification: Main-belt Asteroid          SPK-ID: 2000397 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 71 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2454738210212766 6.1569e-08   a 2.636611991464938 7.2052e-09 AU q 1.989392771369522 1.6194e-07 AU i 12.83162543398657 7.2335e-06 deg node 228.1897980998131 2.8424e-05 deg peri 139.3145706263744 3.0912e-05 deg M 286.7144672374058 1.2311e-05 deg tp 2456718.834354415264 (2014-Mar-02.33435442) 5.4068e-05 JED period 1563.751579192835 4.28 6.41e-06 1.755e-08 d yr n .2302155948490374 9.4368e-10 deg/d Q 3.283831211560354 8.9739e-09 AU   Orbit Determination Parameters    # obs. used (total)      1204      data-arc span      41814 days (114.48 yr)      first obs. used      1898-10-23      last obs. used      2013-04-17      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .59721      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 12:35:03   Additional Information  Earth MOID = 1.00795 AU   T_jup = 3.319  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 9.31 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5 diameter diameter 43.34 km 1.8 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5 rotation period rot_per 15.48 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List: [Harris, A.W.; Young, J.W. (1983) Icarus 54, 59-109.] [Ruthroff, J.C. (2010) Minor Planet Bul. 37, 32-33.] geometric albedo albedo 0.1776   0.015 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5 B-V BV .823 mag .028 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=4; phase (min.=5.45, mean=10.38, max.=21.21) deg. U-B UB .362 mag .030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=4; phase (min.=5.45, mean=10.38, max.=21.21) deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B K   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) 397 Vienna (1894 BM)          Discovered 1894-Dec-19 by Charlois, A. at Nice Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1894 BM = 1941 WA1 = 1951 AV1  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-25 21:05 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin