+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   168 Sibylla (A876 SA) Classification: Outer Main-belt Asteroid          SPK-ID: 2000168 [ 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 52 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07428959363307731 2.2379e-08   a 3.374797175290878 1.1677e-08 au q 3.124084864544461 7.5898e-08 au i 4.668759942699924 8.7725e-07 deg node 205.9520881361957 2.2179e-05 deg peri 175.4913575514259 1.9161e-05 deg M 64.36011739865187 1.5548e-05 deg tp 2458795.659204914309 (2019-Nov-08.15920491) 9.7232e-05 TDB period 2264.487575871042 6.20 1.1753e-05 3.218e-08 d yr n .1589763634987155 8.2511e-10 deg/d Q 3.625509486037295 1.2545e-08 au   Orbit Determination Parameters    # obs. used (total)      3621      data-arc span      52756 days (144.44 yr)      first obs. used      1876-10-14      last obs. used      2021-03-24      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .42431      source      ORB      producer      Otto Matic      solution date      2021-May-03 17:58:14   Additional Information  Earth MOID = 2.12551 au   Jupiter MOID = 1.816 au   T_jup = 3.143  [ 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 8.09   n/a E2021B10 IRAS observations used: 6 diameter diameter 145.366 km 3.219 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 47.009 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Pilcher, F.; Benishek, V.; Brinsfield, J.W. (2008) Minor Planet Bull. 35, 104-105.] geometric albedo albedo 0.056   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.745   0.013 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=1.40, mean=7.89, max.=17.63) deg. U-B UB 0.384   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=1.68, mean=11.14, max.=17.66) 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 Ch   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) 168 Sibylla (A876 SA)          Discovered 1876-Sep-28 by Watson, J. C. at Ann Arbor Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A876 SA = 1949 MO = A911 HF  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jun-17 00:50 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin