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 ]  
987 Wallia (A922 UB)
Classification: Main-belt Asteroid          SPK-ID: 2000987
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 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2364678764690121 3.4061e-08  
a 3.138443300781209 1.243e-08 au
q 2.39630227802708 1.0795e-07 au
i 8.912632792793497 3.9691e-06 deg
node 322.6566325117612 2.2317e-05 deg
peri 16.15759799232065 2.3511e-05 deg
M 210.2444584957077 9.7474e-06 deg
tp 2459845.292906536079
(2022-Sep-22.79290654)
5.8088e-05 TDB
period 2030.812638370859
5.56
1.2065e-05
3.303e-08
d
yr
n .1772689381570897 1.0531e-09 deg/d
Q 3.880584323535339 1.537e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2816  
   data-arc span      35666 days (97.65 yr)  
   first obs. used      1922-10-23  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42982  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:24:28  

Additional Information
 Earth MOID = 1.3886 au 
 Jupiter MOID = 1.52782 au 
 T_jup = 3.149 
[ 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 9.5   n/a MPO265961  
diameter diameter 52.651 km 0.357 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 10.0813 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Lagerkvist, C.-I. (1979) Icarus 38, 106-114.]
[Cieza, L.A.; Ciliberti, L.N.; Iserte, J.A. (1999) IAPPP Comm. #74, 12-23.]
[Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Ferrero, A. (2012) Minor Planet Bull. 39, 65-67.]
geometric albedo albedo 0.144   0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

987 Wallia (A922 UB)          Discovered 1922-Oct-23 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A922 UB = A899 PJ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Jul-12 22:30 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin