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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2359623159244262 3.4579e-08  
a 3.139727229862325 1.2961e-08 au
q 2.398869921333028 1.0932e-07 au
i 8.910074430888924 4.1346e-06 deg
node 322.6531954302916 2.5843e-05 deg
peri 16.16083816452845 2.7125e-05 deg
M 139.3635691403085 9.8484e-06 deg
tp 2457813.847249369245
(2017-Mar-01.34724937)
5.3341e-05 TDB
period 2032.058966156046
5.56
1.2583e-05
3.445e-08
d
yr
n .1771602133578809 1.097e-09 deg/d
Q 3.880584538391623 1.6019e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2382  
   data-arc span      35261 days (96.54 yr)  
   first obs. used      1922-10-23  
   last obs. used      2019-05-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45722  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:17:09  

Additional Information
 Earth MOID = 1.39025 au 
 Jupiter MOID = 1.52432 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-January); 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 ]
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