Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
4809 Robertball (1928 RB)
Classification: Main-belt Asteroid          SPK-ID: 2004809
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ hide orbit diagram ]

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.


[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2466606723587666 2.7757e-08  
a 2.568951453359449 7.8601e-09 au
q 1.935292160616777 7.1109e-08 au
i 13.65691374097692 3.2682e-06 deg
node 169.2318691682916 1.8944e-05 deg
peri 173.6369618764483 2.1514e-05 deg
M 105.7468839627556 1.2072e-05 deg
tp 2458558.728849789661
(2019-Mar-16.22884979)
4.9195e-05 TDB
period 1503.94610333611
4.12
6.9024e-06
1.89e-08
d
yr
n .2393702800927736 1.0986e-09 deg/d
Q 3.202610746102121 9.7989e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2149  
   data-arc span      33641 days (92.10 yr)  
   first obs. used      1928-09-05  
   last obs. used      2020-10-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46692  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:48:32  

Additional Information
 Earth MOID = .928449 au 
 Jupiter MOID = 2.22947 au 
 T_jup = 3.349 
[ 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 12.9   n/a MPO358677  
diameter diameter 6.446 km 0.180 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.354   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Dec-03 21:28 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin