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20640 (1999 TF118)
Classification: Outer Main-belt Asteroid          SPK-ID: 2020640
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2213234535078437 4.0151e-08  
a 3.969412296518605 3.5526e-08 au
q 3.090888258656607 1.6121e-07 au
i 6.973951173900512 5.0003e-06 deg
node 340.0065528326066 3.4458e-05 deg
peri 55.44394464050583 3.5773e-05 deg
M 206.89694954425 1.0937e-05 deg
tp 2460228.982815972676
(2023-Oct-11.48281597)
9.7491e-05 TDB
period 2888.60223511996
7.91
3.8779e-05
1.062e-07
d
yr
n .1246277509665673 1.6731e-09 deg/d
Q 4.847936334380604 4.3388e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1216  
   data-arc span      10436 days (28.57 yr)  
   first obs. used      1991-10-02  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49192  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 05:14:50  

Additional Information
 Earth MOID = 2.10473 au 
 Jupiter MOID = .8385 au 
 T_jup = 3.002 
[ 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 12.9   n/a MPO435891  
diameter diameter 14.186 km 0.484 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  
rotation period rot_per 6.17 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Erasmus, N.; McNeill, A.; Mommert, N.; Trilling, D.E.; et al. (2019) Ap. J. Suppl. Series 242, A15.]
geometric albedo albedo 0.073   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  

20640 (1999 TF118)          Discovered 1999-Oct-04 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1999 TF118 = 1991 TN6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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