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1123 Shapleya (1928 ST)
Classification: Main-belt Asteroid          SPK-ID: 2001123
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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1564776840221165 3.9745e-08  
a 2.225753829817419 6.0055e-09 au
q 1.877473025324233 8.8176e-08 au
i 6.419412905975844 3.5755e-06 deg
node 79.90707161608594 4.3205e-05 deg
peri 317.5411525639603 4.4885e-05 deg
M 148.3594614182153 1.3997e-05 deg
tp 2457100.664764455764
4.6277e-05 JED
period 1212.869628103355
n .2968167325312251 1.2013e-09 deg/d
Q 2.574034634310605 6.9453e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1613  
   data-arc span      31979 days (87.55 yr)  
   first obs. used      1928-09-21  
   last obs. used      2016-04-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51858  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 12:32:10  

Additional Information
 Earth MOID = .889687 au 
 Jupiter MOID = 2.8333 au 
 T_jup = 3.622 
[ 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 11.6 mag n/a MPO265962  
rotation period rot_per 52.92 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Published Reference List:
[Stephens, R.D. (2012) Minor Planet Bul. 39, 80-82.]

1123 Shapleya (1928 ST)          Discovered 1928-Sep-21 by Neujmin, G. at Simeis
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1928 ST = 1974 QQ2 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2016-Apr-29 13:59 UT
(server date/time)  
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