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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 536 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6242486422996562 1.4581e-09  
a 2.545398024656617 4.4661e-10 au
q .9564367636524973 3.8526e-09 au
i .4479490694455599 1.9015e-07 deg
node 125.1994092890702 2.4054e-05 deg
peri 277.9899151528761 2.356e-05 deg
M 311.2833559446107 2.2438e-07 deg
tp 2459201.227485205060
(2020-Dec-17.72748521)
9.77e-07 TDB
period 1483.310192542453
4.06
3.9039e-07
1.069e-09
d
yr
n .2427004154693668 6.3876e-11 deg/d
Q 4.134359285660738 7.2541e-10 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] -4.110611458581743E-13 9.314E-14
A2 [EST] -6.483031105495231E-15 1.042E-15
  Orbit Determination Parameters
   # obs. used (total)      6203  
   # delay obs. used      35  
   # Doppler obs. used      28  
   data-arc span      31692 days (86.77 yr)  
   first obs. used      1934-02-10  
   last obs. used      2020-11-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .2673  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-18 05:28:41  

Additional Information
 Earth MOID = .00657948 au 
 Jupiter MOID = 1.28945 au 
 T_jup = 3.137 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455393.5 (2010-Jul-16.0) TDB
Reference: JPL 536 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6289947845722037 1.3585e-09  
q .9389056478797998 3.4083e-09 au
tp 2454776.731836961538
(2008-Nov-06.23183696)
4.8169e-07 TDB
node 124.3737543051542 2.5206e-05 deg
peri 278.6502961013138 2.4692e-05 deg
i .44638195476025 1.8545e-07 deg

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] -4.110611458581743E-13 9.314E-14
A2 [EST] -6.483031105495231E-15 1.042E-15
  Orbit Determination Parameters
   # obs. used (total)      6203  
   # delay obs. used      35  
   # Doppler obs. used      28  
   data-arc span      31692 days (86.77 yr)  
   first obs. used      1934-02-10  
   last obs. used      2020-11-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .2673  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-18 05:28:41  

Additional Information
 Jupiter MOID = 1.28945 au 
 T_jup = 3.137 
Orbit Covariance (8×8)
  e q tp node peri i A1 A2
e 1.845497664448027E-18 -4.6299934042542E-18 -5.993409425186948E-16 -3.04351394345608E-14 2.954924992445034E-14 -2.422893353854614E-16 3.255898671053346E-24 -1.360412966213411E-24
q -4.6299934042542E-18 1.161620563355015E-17 1.506282634432877E-15 7.623081600148114E-14 -7.400542135415615E-14 6.07287353122076E-16 -9.749253649628031E-24 3.411024647985838E-24
tp -5.993409425186948E-16 1.506282634432877E-15 2.320238334360541E-13 8.582600344468321E-12 -8.254260726523312E-12 7.333198625874194E-14 -1.557335003131937E-20 4.457348595763345E-22
node -3.04351394345608E-14 7.623081600148114E-14 8.582600344468321E-12 6.353574200373235E-10 -6.222811967651904E-10 4.576211178199206E-12 5.455067252761038E-19 2.156948379323792E-20
peri 2.954924992445034E-14 -7.400542135415615E-14 -8.254260726523312E-12 -6.222811967651904E-10 6.096764324766231E-10 -4.466081293899475E-12 -5.634104165845156E-19 -2.091227486903371E-20
i -2.422893353854614E-16 6.07287353122076E-16 7.333198625874194E-14 4.576211178199206E-12 -4.466081293899475E-12 3.439207972946017E-14 2.305969820705113E-21 1.760538257554886E-22
A1 3.255898671053346E-24 -9.749253649628031E-24 -1.557335003131937E-20 5.455067252761038E-19 -5.634104165845156E-19 2.305969820705113E-21 8.674519559843458E-27 4.961281643892525E-30
A2 -1.360412966213411E-24 3.411024647985838E-24 4.457348595763345E-22 2.156948379323792E-20 -2.091227486903371E-20 1.760538257554886E-22 4.961281643892525E-30 1.084729793737371E-30

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. 2019-August); 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.DBLast 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 ]
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