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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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2508553477476045 3.3782e-08  
a 2.65862287769347 8.2174e-09 au
q 1.991693111179937 8.9699e-08 au
i 14.69932314906308 3.6687e-06 deg
node 243.397692214854 1.7158e-05 deg
peri 165.6712306747418 1.8993e-05 deg
M 174.8729305503674 9.9371e-06 deg
tp 2458231.363147741483
(2018-Apr-22.86314774)		 4.1839e-05 TDB
period 1583.374087353763
4.34		 7.341e-06
2.01e-08		 d
yr
n .2273625688807723 1.0541e-09 deg/d
Q 3.325552644207002 1.0279e-08 au
   Orbit Determination Parameters
   # obs. used (total)      2488  
   data-arc span      35647 days (97.60 yr)  
   first obs. used      1922-11-12  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .3805  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:24:28  

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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