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 ]  
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2267971221653864 4.2129e-08  
a 2.789248562639075 1.3796e-08 au
q 2.156655015628592 1.1446e-07 au
i 16.15443291019331 4.8088e-06 deg
node 232.1131325878189 1.4697e-05 deg
peri 202.3528331547915 1.7357e-05 deg
M 217.9537405957319 1.0851e-05 deg
tp 2459671.861688861122
(2022-Apr-02.36168886)
5.4371e-05 TDB
period 1701.489423259967
4.66
1.2624e-05
3.456e-08
d
yr
n .2115793345986591 1.5698e-09 deg/d
Q 3.421842109649558 1.6925e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1849  
   data-arc span      13126 days (35.94 yr)  
   first obs. used      1984-10-26  
   last obs. used      2020-10-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43722  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:25:27  

Additional Information
 Earth MOID = 1.17854 au 
 Jupiter MOID = 1.94185 au 
 T_jup = 3.235 
[ 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 1.94509936156425 1.94509891276369 1.94509981036603 4.09430503997071 3.98652780537386 2428271.329112255 1.49284397381576 205.440773498909 20.6316341065098 -87.4460013294144 3217586.63834068 T 34 CATAB v2.0f-lin.ifort 2020-Nov-13 03:25:31 2020-Nov-13 03:25
2043-Apr-11 08:18 < 00:01 Jupiter 1.9637496655876 1.96374925554762 1.96375007562769 3.89497175274154 3.78261108391354 2467350.845868340 0.616030924263027 136.109151483517 19.0643600070108 88.3179829382363 2934378.04769166 T 34 CATAB v2.0f-lin.ifort 2020-Nov-13 03:25:31 2020-Nov-13 03:25
2150-Apr-13 07:38 00:03 Jupiter 1.99588856543429 1.99588764562659 1.99588948525151 3.61758996160177 3.49831242012198 2506433.818042715 2.83373710280717 282.300573200001 32.2852877340888 -80.7780334338155 2228979.60010787 T 34 CATAB v2.0f-lin.ifort 2020-Nov-13 03:25:31 2020-Nov-13 03:25
2173-Mar-09 14:33 00:03 Jupiter 1.97031802342868 1.97031709646058 1.97031895043901 4.1931914176403 4.08938525044813 2514800.106288789 3.09032107512611 497.045260310789 15.214852181326 85.4601442465502 3151611.54328354 T 34 CATAB v2.0f-lin.ifort 2020-Nov-13 03:25:31 2020-Nov-13 03:25

Alternate Designations
 1984 UT = 2017 UV86 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jan-20 16:44 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin