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JPL Small-Body Database Browser
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989 Schwassmannia (A922 WD)
Classification: Main-belt Asteroid          SPK-ID: 2000989
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2508553568986086 3.4971e-08  
a 2.65862287959893 8.3772e-09 au
q 1.991693088278334 9.2832e-08 au
i 14.6993211460329 3.7407e-06 deg
node 243.3976899256931 2.1166e-05 deg
peri 165.6712235103187 2.3324e-05 deg
M 174.8729369357368 1.0945e-05 deg
tp 2458231.363118830089
(2018-Apr-22.86311883)		 4.6552e-05 TDB
period 1583.374089055991
4.34		 7.4837e-06
2.049e-08		 d
yr
n .227362568636343 1.0746e-09 deg/d
Q 3.325552670919525 1.0479e-08 au
   Orbit Determination Parameters
   # obs. used (total)      2165  
   data-arc span      35244 days (96.49 yr)  
   first obs. used      1922-11-12  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38753  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:17:09  

Additional Information
 Earth MOID = 1.00588 au 
 Jupiter MOID = 2.06911 au 
 T_jup = 3.296 
[ show covariance matrix ]

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.8   n/a MPO473776  
diameter diameter 12.630 km 0.124 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 107.85 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Benishek, V.; Pilcher, F.; Martinez, L. (2014) Minor Planet Bull. 41, 133.]
geometric albedo albedo 0.306   0.064 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

989 Schwassmannia (A922 WD)          Discovered 1922-Nov-18 by Schwassmann, A. at Bergedorf
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A922 WD = 1935 UE = 1935 UF 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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