+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2060 Chiron (1977 UB) Classification: Centaur          SPK-ID: 2002060 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 131 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3787836686024125 7.3371e-08   a 13.68570638966072 1.4895e-06 au q 8.501784315969557 8.9726e-07 au i 6.939550266990163 5.7907e-06 deg node 209.2424353144811 3.9594e-05 deg peri 339.8102594746993 4.2174e-05 deg M 172.8369427686686 3.5839e-05 deg tp 2450122.128169717194 (1996-Feb-08.62816972) 0.00046447 TDB period 18492.65445049987 50.63 0.003019 8.266e-06 d yr n .01946718903787601 3.1781e-09 deg/d Q 18.86962846335189 2.0537e-06 au   Orbit Determination Parameters    # obs. used (total)      3210      data-arc span      45860 days (125.56 yr)      first obs. used      1895-04-24      last obs. used      2020-11-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43773      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:04:09   Additional Information  Earth MOID = 7.50369 au   Jupiter MOID = 3.06789 au   T_jup = 3.360  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 5.8   n/a MPO431518   diameter diameter 166 km n/a Dunham occultation list: Duham 1998 Yeomans E-mail 2001-Apr-04 rotation period rot_per 5.918 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Bus, S.J.; Bowell, E.; Harris, A.W.; Hewitt, A.V. (1989) Icarus 77, 223-238.] [Luu, J.X.; Jewitt, D.C. (1990) Astron. J. 100, 913-932.] [Marcialis, R.L.; Buratti, B.J. (1993) Icarus 104, 234-243.] [Lazzaro, D.; Florczak, M.A.; Angeli, C.A.; Carvano, J.M.; et al. (1997) Planet. Space Sci. 45, 1607-1614.] geometric albedo albedo 0.15   0.03 Earth, Moon, and Planets, v. 89, Issue 1, p. 117-134 (2002)   B-V BV 0.704   0.024 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=1.81, mean=2.51, max.=2.88) deg. U-B UB 0.283   0.060 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=1.81, mean=2.51, max.=2.88) deg. Tholen spectral type spec_T B   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 4 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B Cb   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) 2060 Chiron (1977 UB)          Discovered 1977-Oct-18 by Kowal, C. at Palomar Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1977 UB = 95P  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-28 06:27 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin