+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   4179 Toutatis (1989 AC) Classification: Apollo [NEO, PHA]          SPK-ID: 2004179 [ 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 560 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .6242486422954475 1.4578e-09   a 2.545398024663089 4.4653e-10 au q .9564367636656416 3.8518e-09 au i .4479490687255054 1.9011e-07 deg node 125.1994091735951 2.4049e-05 deg peri 277.9899152644884 2.3556e-05 deg M 311.2833559440169 2.2433e-07 deg tp 2459201.227485208272 (2020-Dec-17.72748521) 9.7681e-07 TDB period 1483.310192548111 4.06 3.9032e-07 1.069e-09 d yr n .2427004154684412 6.3864e-11 deg/d Q 4.134359285660537 7.2527e-10 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] -4.108395394871262E-13 9.313E-14 A2 [EST] -6.485330652307018E-15 1.041E-15   Orbit Determination Parameters    # obs. used (total)      6321      # delay obs. used      35      # Doppler obs. used      28      data-arc span      31752 days (86.93 yr)      first obs. used      1934-02-10      last obs. used      2021-01-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .26702      source      ORB      producer      Otto Matic      solution date      2021-Jan-17 06:07:11   Additional Information  Earth MOID = .00657948 au   Jupiter MOID = 1.28945 au   T_jup = 3.137  [ 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 15.2   n/a MPO473823   magnitude slope G 0.10   n/a PDS3 (MPC 28111) Fit diameter diameter 5.4 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543 based on assumed medium albedo (0.15) extent extent 1.70x2.03x4.26 km 0.08 Hudson et al. (2003) Icarus 161:346-355 dynamically equivalent, equal volume ellipsoid rotation period rot_per 176. h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Nakamura, T.; Fuse, T. (1998) Pub. Astron. Soc. Japan 50, 531-536.] [Pravec, P.; et al. (2005) Icarus 173, 108-131.] geometric albedo albedo 0.405   0.137 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)   SMASSII spectral type spec_B Sk   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) 4179 Toutatis (1989 AC)          Discovered 1989-Jan-04 by Pollas, C. at Caussols Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1989 AC = 1934 CT  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-18 13:47 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin