+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   82 Alkmene (A864 WA) Classification: Main-belt Asteroid          SPK-ID: 2000082 [ 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 117 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2203304475424646 1.6053e-08   a 2.763405256885657 3.8629e-09 au q 2.154542939894841 4.5503e-08 au i 2.826257310876136 8.5642e-07 deg node 25.443615463925 6.2344e-06 deg peri 111.1168888946964 7.2284e-06 deg M 304.5747987700726 6.28e-06 deg tp 2459458.827162603255 (2021-Sep-01.32716260) 2.9633e-05 TDB period 1677.896994029435 4.59 3.5182e-06 9.632e-09 d yr n .2145542910446889 4.4988e-10 deg/d Q 3.372267573876473 4.714e-09 au   Orbit Determination Parameters    # obs. used (total)      3486      data-arc span      57073 days (156.26 yr)      first obs. used      1864-12-05      last obs. used      2021-03-10      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .46772      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 10:15:56   Additional Information  Earth MOID = 1.17013 au   Jupiter MOID = 1.67005 au   T_jup = 3.303  [ 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 8.28   n/a E2021B10 IRAS observations used: 12 magnitude slope G 0.28   n/a PDS3 (MPC 17257) Fit diameter diameter 57.621 km 0.714 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 12.999 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Harris, A.W.; Young, J.; Scaltriti, F.; Zappala, V. (1984) Icarus 57, 251-258.] [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Durech, J. (2006) IAU 2006, poster paper.] [Durech, J.; Kaasalainen, M.; Warner, B.D.; Fauerbach, M.; et al. (2009) Astron. Astrophys. 493, 291-297.] [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.] geometric albedo albedo 0.167   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.814   0.014 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=8.57, mean=15.80, max.=23.77) deg. U-B UB 0.380   0.029 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=8.57, mean=15.80, max.=23.77) deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B Sq   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) 82 Alkmene (A864 WA)          Discovered 1864-Nov-27 by Luther, R. at Dusseldorf Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A864 WA = 1952 BB = 1963 OA = 1973 GO  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-23 03:06 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin