+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   386 Siegena (A894 EB) Classification: Main-belt Asteroid          SPK-ID: 2000386 [ 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 108 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1687507947685309 3.2037e-08   a 2.897828047294785 7.6247e-09 au q 2.40881726121125 9.2109e-08 au i 20.21770359437396 3.2752e-06 deg node 166.6445626668574 1.1711e-05 deg peri 220.6706979415269 1.616e-05 deg M 25.25807117191622 1.2217e-05 deg tp 2459074.083132100763 (2020-Aug-12.58313210) 6.1097e-05 TDB period 1801.803159630294 4.93 7.1113e-06 1.947e-08 d yr n .1997998494318698 7.8856e-10 deg/d Q 3.38683883337832 8.9114e-09 au   Orbit Determination Parameters    # obs. used (total)      3518      data-arc span      46338 days (126.87 yr)      first obs. used      1894-03-05      last obs. used      2021-01-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42988      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:46:08   Additional Information  Earth MOID = 1.43861 au   Jupiter MOID = 2.15581 au   T_jup = 3.176  [ 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 7.71   n/a E2021B10 IRAS observations used: 19 magnitude slope G 0.16   n/a PDS3 (MPC 17258) Fit diameter diameter 165.01 km 2.7 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 19 rotation period rot_per 9.763 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Zappala, V.; Scaltriti, F.; Lagerkvist, C.-I.; Rickman, H.; Harris, A.W. (1982) Icarus 52, 196-201.] [Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Stephens, R.D. (2007) Minor Planet Bull. 34, 64-65.] [Behrend, R. (2012) 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.] [Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.] [Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.0692   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 19 B-V BV 0.723   0.011 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=3.84, mean=16.39, max.=21.64) deg. U-B UB 0.407   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=3.84, mean=16.39, max.=21.64) deg. Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B C   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) 386 Siegena (A894 EB)          Discovered 1894-Mar-01 by Wolf, M. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A894 EB = 1948 EW  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-09 05:27 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin