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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2506811227357891 3.3795e-08  
a 2.659105182750108 8.1706e-09 au
q 1.992517710065755 8.9821e-08 au
i 14.69719946950214 3.6672e-06 deg
node 243.3974468709455 1.694e-05 deg
peri 165.6272947406541 1.8767e-05 deg
M 220.4036076665303 1.0022e-05 deg
tp 2459814.648500137990
(2022-Aug-23.14850014)
4.5802e-05 TDB
period 1583.80497055773
4.34
7.2998e-06
1.999e-08
d
yr
n .2273007135930553 1.0476e-09 deg/d
Q 3.32569265543446 1.0219e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2556  
   data-arc span      35713 days (97.78 yr)  
   first obs. used      1922-11-12  
   last obs. used      2020-08-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .37887  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:23:39  

Additional Information
 Earth MOID = 1.00593 au 
 Jupiter MOID = 2.07007 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 11.93   n/a E2021B10  
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. 2020-October); 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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