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JPL Small-Body Database Browser
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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.


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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01485163020908195 4.0806e-08  
a 2.93703998934236 1.7591e-08 au
q 2.893420157511361 1.2064e-07 au
i 7.298150445263252 4.8196e-06 deg
node 187.9216813350812 3.5141e-05 deg
peri 222.8120815887574 0.00016487 deg
M 334.882522040216 0.00016055 deg
tp 2458728.773441132614
(2019-Sep-02.27344113)
0.00081986 TDB
period 1838.498231457711
5.03
1.6518e-05
4.522e-08
d
yr
n .195811991461402 1.7592e-09 deg/d
Q 2.980659821173359 1.7853e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1184  
   data-arc span      17787 days (48.70 yr)  
   first obs. used      1971-03-24  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54635  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 23:29:50  

Additional Information
 Earth MOID = 1.90201 au 
 Jupiter MOID = 2.05369 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 14.1   n/a MPO332940  
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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