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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 538 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .624248642306229 1.458e-09  
a 2.545398024650307 4.466e-10 au
q .9564367636333955 3.8524e-09 au
i .4479490691887562 1.9014e-07 deg
node 125.1994092408335 2.4053e-05 deg
peri 277.9899152010666 2.3559e-05 deg
M 311.2833559449779 2.2437e-07 deg
tp 2459201.227485202801
(2020-Dec-17.72748520)
9.7696e-07 TDB
period 1483.310192536937
4.06
3.9037e-07
1.069e-09
d
yr
n .2427004154702694 6.3873e-11 deg/d
Q 4.134359285667218 7.2538e-10 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] -4.108476342190339E-13 9.314E-14
A2 [EST] -6.483188884244108E-15 1.041E-15
  Orbit Determination Parameters
   # obs. used (total)      6212  
   # delay obs. used      35  
   # Doppler obs. used      28  
   data-arc span      31703 days (86.80 yr)  
   first obs. used      1934-02-10  
   last obs. used      2020-11-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .26715  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-29 05:19:01  

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. 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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