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113394 Niebur (2002 SN21)
Classification: Main-belt Asteroid          SPK-ID: 2113394
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 6 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07243769873009037 1.2635e-07  
a 2.774471953559392 5.4876e-08 au
q 2.573495590052372 3.5204e-07 au
i 1.295026006834037 1.277e-05 deg
node 18.71278908340842 0.00032455 deg
peri 352.4564974587444 0.00033126 deg
M 354.9200427722363 8.8291e-05 deg
tp 2457624.319162661100
0.00041453 JED
period 1687.986369477957
n .2132718643405498 6.3275e-09 deg/d
Q 2.975448317066412 5.8852e-08 au
  Orbit Determination Parameters
   # obs. used (total)      225  
   data-arc span      5171 days (14.16 yr)  
   first obs. used      2000-03-03  
   last obs. used      2014-04-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .60813  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Oct-09 17:25:41  

Additional Information
 Earth MOID = 1.57185 au 
 Jupiter MOID = 2.38325 au 
 T_jup = 3.332 
[ 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 15.8 mag n/a MPO293994  

113394 Niebur           Discovered 2002 Sept. 26 by MEAT at Palomar.
Trained as an astrophysicist, Susan Niebur (1978-2012) was a former Discovery Program Scientist at NASA and contributed to space-science policy. She founded the Women in Planetary Science and Toddler Planet websites. Name suggested by A. Sohus.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20120406/MPCPages.arcLast Updated: 2012-04-09

[ show close-approach data ]
Alternate Designations
 2002 SN21 = 2000 EE194 = 2004 AB25 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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