+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   65 Cybele (A861 EB) Classification: Outer Main-belt Asteroid          SPK-ID: 2000065 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 90 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1128277657421112 3.1925e-08   a 3.427764351314908 7.9661e-09 au q 3.04101735806559 1.1e-07 au i 3.564443588618698 3.7344e-06 deg node 155.6037310219785 5.5303e-05 deg peri 103.0135511608722 5.7449e-05 deg M 24.42790834559084 1.657e-05 deg tp 2459239.210893759692 (2021-Jan-24.71089376) 0.00010646 TDB period 2318.007642956109 6.35 8.0806e-06 2.212e-08 d yr n .1553057864558631 5.414e-10 deg/d Q 3.814511344564226 8.8649e-09 au   Orbit Determination Parameters    # obs. used (total)      4054      data-arc span      58529 days (160.24 yr)      first obs. used      1861-03-12      last obs. used      2021-06-10      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .44705      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 10:29:24   Additional Information  Earth MOID = 2.02864 au   Jupiter MOID = 1.25277 au   T_jup = 3.128  [ 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 6.89   n/a MPCxxxxx IRAS observations used: 17 magnitude slope G 0.01   n/a PDS3 (MPC 17257) Fit diameter diameter 237.26 km 4.2 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17 rotation period rot_per 6.0814 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Schober, H.J.; Scaltriti, F.; Zappala, V.; Harris, A.W. (1980) Astron. Astrophys. 91, 1-6.] [Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R.; Greenberg, R.; et al. (1987) Icarus 70, 191-245.] [Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Pilcher, F.; Stephens, R.D. (2010) Minor Planet Bull. 37, 8.] [Pilcher, F. (2012) Minor Planet Bull. 39, 57-60.] [Pilcher, F. (2014) Minor Planet Bull. 41, 250-252.] [Franco, L.; Pilcher, F. (2015) Minor Planet Bull. 42, 204-206.] [Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Viikinkoski, M.; Hanus, J.; Kaasalainen, M.; Marchis, F.; Durech, J. (2017) Astron. Astrophys. 607, A117.] geometric albedo albedo 0.0706   0.003 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 17 B-V BV 0.690   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=17; phase (min.=1.75, mean=10.38, max.=18.00) deg. U-B UB 0.271   0.024 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=1.75, mean=4.51, max.=10.04) deg. Tholen spectral type spec_T P   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B Xc   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) 65 Cybele (A861 EB)          Discovered 1861-Mar-08 by Tempel, E. W. at Marseille Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A861 EB = 1949 YQ  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jul-27 00:00 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin