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18868 (1999 TD101)
Classification: Outer Main-belt Asteroid          SPK-ID: 2018868
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03588241457754377 3.7167e-08  
a 3.213349523005037 1.8046e-08 au
q 3.098046783238018 1.2211e-07 au
i 12.7416436710828 3.1581e-06 deg
node 116.0927590986011 1.8657e-05 deg
peri 295.3634333096405 5.6995e-05 deg
M 217.8048173888155 5.6414e-05 deg
tp 2460031.532025116427
(2023-Mar-28.03202512)
0.00033399 TDB
period 2103.949821281655
5.76
1.7723e-05
4.852e-08
d
yr
n .1711067423560036 1.4414e-09 deg/d
Q 3.328652262772057 1.8693e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2107  
   data-arc span      15338 days (41.99 yr)  
   first obs. used      1979-03-22  
   last obs. used      2021-03-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4461  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 02:48:36  

Additional Information
 Earth MOID = 2.13562 au 
 Jupiter MOID = 1.85616 au 
 T_jup = 3.151 
[ 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 12.7   n/a MPO474015  
diameter diameter 8.874 km 0.152 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.224   0.055 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18868 (1999 TD101)          Discovered 1999-Oct-02 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1999 TD101 = 1979 FA4 = 1984 BS2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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