+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 111 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2202808135719321 3.3889e-08   a 2.762811974182417 4.225e-09 au q 2.154217504763238 9.3212e-08 au i 2.82647313160241 2.9515e-06 deg node 25.44437279777465 7.8665e-05 deg peri 111.1670751618484 7.8928e-05 deg M 261.5988252268187 7.7222e-06 deg tp 2459458.982964785732 (2021-Sep-01.48296479) 3.654e-05 TDB period 1677.356674890512 4.59 3.8476e-06 1.053e-08 d yr n .2146234044250002 4.9231e-10 deg/d Q 3.371406443601596 5.1556e-09 au   Orbit Determination Parameters    # obs. used (total)      3264      data-arc span      56942 days (155.90 yr)      first obs. used      1864-12-05      last obs. used      2020-10-30      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .47647      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:33:33   Additional Information  Earth MOID = 1.16989 au   Jupiter MOID = 1.67133 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 8.2   n/a MPO502153 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. 2019-August); 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 ] 2020-Dec-02 01:01 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin