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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 ]

[ show orbit diagram ]
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 
[ 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 12.8   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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1936-Apr-12 19:54 00:02 Jupiter 1.94509938288704 1.94509891033201 1.9450998554434 4.0943048260363 3.98652758685311 2428271.329083097 1.52235860161069 208.444082048506 21.5444142830763 -87.2965170509555 3104154.95012137 T 29 CATAB v2.0f-lin.ifort 2019-Sep-24 00:59:24 2019-Sep-24 00:59
2043-Apr-11 08:18 < 00:01 Jupiter 1.96374972341453 1.9637492917138 1.96375015511537 3.89497140058221 3.78261072465134 2467350.845931862 0.655739678300158 144.294788082006 20.193373888731 88.6294234067584 2810564.99938543 T 29 CATAB v2.0f-lin.ifort 2019-Sep-24 00:59:24 2019-Sep-24 00:59
2150-Apr-13 07:38 00:03 Jupiter 1.99588869455196 1.99588773505989 1.99588965405458 3.61758938746051 3.49831183425278 2506433.818202562 2.93829297691502 294.299899958795 33.3494679149877 -80.7404846706642 2150447.7716852 T 29 CATAB v2.0f-lin.ifort 2019-Sep-24 00:59:24 2019-Sep-24 00:59
2173-Mar-09 14:33 00:03 Jupiter 1.97031795525183 1.97031697344114 1.97031893710833 4.1931909005546 4.08938471659909 2514800.106465448 3.20068729170367 517.686134704201 16.0339833006311 85.3797335753539 3011701.61427137 T 29 CATAB v2.0f-lin.ifort 2019-Sep-24 00:59:24 2019-Sep-24 00:59
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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