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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2504128688901185 1.357e-08  
a 2.660283949720515 7.8282e-09 au
q 1.994114613808665 3.5708e-08 au
i 14.69156780012453 5.7971e-07 deg
node 243.3850494039917 3.0831e-06 deg
peri 165.543541471445 4.5281e-06 deg
M 265.0446185753475 7.2482e-06 deg
tp 2459814.530048086366
(2022-Aug-23.03004809)
3.3226e-05 TDB
period 1584.858225549933
4.34
6.9954e-06
1.915e-08
d
yr
n .2271496555315432 1.0026e-09 deg/d
Q 3.326453285632366 9.7885e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2740  
   data-arc span      36018 days (98.61 yr)  
   first obs. used      1922-11-12  
   last obs. used      2021-06-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .3774  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 11:48:46  

Additional Information
 Earth MOID = 1.00787 au 
 Jupiter MOID = 2.07071 au 
 T_jup = 3.295 
[ 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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