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171839 (2001 JM1)
Classification: Apollo [NEO, PHA]          SPK-ID: 2171839
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 65 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3110096494635445 1.3894e-07  
a 1.460936077306213 1.8431e-08 au
q 1.006570860014562 2.1447e-07 au
i 17.07268501851451 1.3635e-05 deg
node 226.6927938880396 1.5105e-05 deg
peri 321.897343603793 4.1929e-05 deg
M 244.2800582236117 7.3055e-05 deg
tp 2457807.824656024653
0.00013478 JED
period 644.9785147066517
n .5581581274280659 1.0563e-08 deg/d
Q 1.915301294597864 2.4164e-08 au
  Orbit Determination Parameters
   # obs. used (total)      478  
   data-arc span      5002 days (13.69 yr)  
   first obs. used      2001-05-12  
   last obs. used      2015-01-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .41256  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 22:34:31  

Additional Information
 Earth MOID = .0458575 au 
 Jupiter MOID = 3.09448 au 
 T_jup = 4.524 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 19.1 mag n/a MPO241229  
rotation period rot_per 5.7516 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Incomplete or inconclusive result.
Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2001)]
SMASSII spectral type spec_B S   n/a Binzel et al. (2004) Icarus 170, 259-294  

171839 (2001 JM1)          Discovered 2001-May-12 by NEAT at Haleakala
Reference: 20071224/Numbers.arcLast Updated: 2007-12-22

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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