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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 599 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6240916308724165 1.3702e-09  
a 2.54449569301545 2.2249e-09 au
q .9564972262135982 3.5705e-09 au
i .4480715507465068 1.7496e-07 deg
node 125.1982984730425 2.2127e-05 deg
peri 277.9991177908494 2.1689e-05 deg
M 359.8176482368229 2.2944e-07 deg
tp 2459201.250945593371
(2020-Dec-17.75094559)
9.4552e-07 TDB
period 1482.521522705976
4.06
1.9445e-06
5.324e-09
d
yr
n .2428295269150016 3.1849e-10 deg/d
Q 4.132494159817302 3.6134e-09 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] -3.048242736750205E-13 9.284E-14
A2 [EST] -7.766767064630682E-15 9.775E-16
  Orbit Determination Parameters
   # obs. used (total)      6558  
   # delay obs. used      35  
   # Doppler obs. used      28  
   data-arc span      31843 days (87.18 yr)  
   first obs. used      1934-02-10  
   last obs. used      2021-04-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .2681  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-18 06:24:54  

Additional Information
 Earth MOID = .00655982 au 
 Jupiter MOID = 1.2924 au 
 T_jup = 3.138 
[ 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 15.24   n/a E2021B10  
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.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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