Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Near-Earth Object (NEO) Program
Search JPL
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
JPL Small-Body Database Browser
Search: [ help ]  
4809 Robertball (1928 RB)
Classification: Main-belt Asteroid          SPK-ID: 2004809
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ hide orbit diagram ]
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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2489051341887467 1.0867e-07  
a 2.567261062673765 1.7732e-08 AU
q 1.928256603371407 2.8811e-07 AU
i 13.6765626894851 7.2638e-06 deg
node 169.3125500998322 2.3496e-05 deg
peri 173.3744263238563 2.6775e-05 deg
M 347.0630023474586 1.8967e-05 deg
tp 2457054.492629226026
7.9618e-05 JED
period 1502.461934632168
n .2396067359191599 2.4825e-09 deg/d
Q 3.206265521976122 2.2146e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1005  
   data-arc span      31417 days (86.02 yr)  
   first obs. used      1928-09-08  
   last obs. used      2014-09-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5144  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 13:55:28  

Additional Information
 Earth MOID = .92182 AU 
 T_jup = 3.349 
[ 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 12.8 mag n/a MPO259373  

4809 Robertball           Discovered 1928 Sept. 5 by M. F. Wolf at Heidelberg.
Mathematician and astronomer Robert Stawell Ball (1840-1913) was one of the most successful popularizers of science of his time. Tutor to the children of the fourth Earl of Rosse and observer at Birr Castle, he later moved to Dublin as Royal Astronomer of Ireland until becoming Lowndean professor at Cambridge in 1893.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20041126/MPCPages.arcLast Updated: 2004-12-06

[ show close-approach data ]
Alternate Designations
 1928 RB = 1969 PS = 1988 CP6 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2015-Mar-27 15:40 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin