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JPL Small-Body Database Browser
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12938 (4161 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2012938
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1422774016359017 4.3819e-08  
a 2.637188987220356 1.4067e-08 au
q 2.261976590495828 1.1241e-07 au
i 7.216399321490628 4.9986e-06 deg
node 337.6502645086504 3.2383e-05 deg
peri 157.1506280032151 3.5864e-05 deg
M 132.9119306008937 1.7105e-05 deg
tp 2458022.973691610280
(2017-Sep-26.47369161)
7.2502e-05 TDB
period 1564.264924001497
4.28
1.2516e-05
3.427e-08
d
yr
n .2301400449989605 1.8414e-09 deg/d
Q 3.012401383944884 1.6069e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1000  
   data-arc span      21522 days (58.92 yr)  
   first obs. used      1960-09-24  
   last obs. used      2019-08-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50355  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 01:13:37  

Additional Information
 Earth MOID = 1.27805 au 
 Jupiter MOID = 2.0211 au 
 T_jup = 3.371 
[ 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 14.6   n/a MPO395128  
diameter diameter 5.771 km 0.372 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.092   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

12938 (4161 P-L)          Discovered 1960-Sep-24 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar
Reference: 19991222/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 4161 P-L = 1992 BU 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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