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7812 Billward (1984 UT)
Classification: Main-belt Asteroid          SPK-ID: 2007812
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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.


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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2288581543557255 4.4194e-08  
a 2.784566265968532 1.3726e-08 au
q 2.147295569657759 1.2e-07 au
i 16.19635034913968 5.0271e-06 deg
node 232.191807818469 1.5666e-05 deg
peri 202.0635937901806 1.8513e-05 deg
M 133.5365544711946 1.0605e-05 deg
tp 2457970.946810283556
(2017-Aug-05.44681028)
4.7812e-05 TDB
period 1697.206800006275
4.65
1.2549e-05
3.436e-08
d
yr
n .2121132203799024 1.5684e-09 deg/d
Q 3.421836962279304 1.6868e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1651  
   data-arc span      12714 days (34.81 yr)  
   first obs. used      1984-10-26  
   last obs. used      2019-08-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45099  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 00:59:16  

Additional Information
 Earth MOID = 1.16877 au 
 Jupiter MOID = 1.94093 au 
 T_jup = 3.236 
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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 12.8   n/a MPO435773  
diameter diameter 16.889 km 0.315 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.056   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

7812 Billward           Discovered 1984 Oct. 26 by E. Bowell at the Anderson Mesa Station of the Lowell Observatory.
Named in honor of William R. Ward (b. 1943), an accomplished theoretician who specializes in dynamics and celestial mechanics. Ward has made fundamental contributions to a wide variety of topics in modern planetary science, including both solar nebula and circumplanetary disk dynamics, the origin of the moon, planetesimal formation, planetary ring dynamics, and martian obliquity variations and their coupling to planetwide climatological change. Ward has spent most of his career at the Jet Propulsion Laboratory and Southwest Research Institute, Boulder. Both his talents and his good spirits are enjoyed by colleagues around the world. Name proposed and citation written by S. A. Stern.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990728/MPCPages.arcLast Updated: 2010-06-11

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