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12954 (2040 T-2)
Classification: Main-belt Asteroid          SPK-ID: 2012954
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01527431709066913 3.7237e-08  
a 2.937746613461035 1.5195e-08 au
q 2.892874540154992 1.0601e-07 au
i 7.297671913491724 4.06e-06 deg
node 187.900495465248 2.9935e-05 deg
peri 222.0760865593333 0.0001424 deg
M 93.05751935771718 0.00013834 deg
tp 2458725.089358266841
(2019-Aug-29.58935827)
0.000707 TDB
period 1839.161759363447
5.04
1.427e-05
3.907e-08
d
yr
n .1957413469300274 1.5187e-09 deg/d
Q 2.982618686767078 1.5428e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1471  
   data-arc span      18261 days (50.00 yr)  
   first obs. used      1971-03-24  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5179  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 01:20:22  

Additional Information
 Earth MOID = 1.90078 au 
 Jupiter MOID = 2.05198 au 
 T_jup = 3.262 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.21   n/a MPCxxxxx  
diameter diameter 4.442 km 0.463 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.247   0.127 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

12954 (2040 T-2)          Discovered 1973-Sep-29 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar
Reference: 19991222/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 2040 T-2 = 1981 EM42 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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