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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 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2504128682104 1.3507e-08  
a 2.660283949356256 7.7985e-09 au
q 1.994114615343866 3.5584e-08 au
i 14.69156780687855 5.7945e-07 deg
node 243.3850493718234 3.0815e-06 deg
peri 165.5435413564075 4.5218e-06 deg
M 265.044618953978 7.2207e-06 deg
tp 2459814.530046333631
(2022-Aug-23.03004633)
3.3096e-05 TDB
period 1584.858225224423
4.34
6.9689e-06
1.908e-08
d
yr
n .2271496555781969 9.9882e-10 deg/d
Q 3.326453283368646 9.7513e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2767  
   data-arc span      36036 days (98.66 yr)  
   first obs. used      1922-11-12  
   last obs. used      2021-07-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .37586  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 07:13:18  

Additional Information
 Earth MOID = 1.00787 au 
 Jupiter MOID = 2.07071 au 
 T_jup = 3.295 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456997.5 (2014-Dec-06.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .250528765116431 1.3449e-08  
q 1.993858476627944 3.5288e-08 au
tp 2456649.012648245121
(2013-Dec-22.51264825)
2.4825e-05 TDB
node 243.4393856782783 3.081e-06 deg
peri 165.9831248225294 4.5108e-06 deg
i 14.69421314441948 5.788e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2767  
   data-arc span      36036 days (98.66 yr)  
   first obs. used      1922-11-12  
   last obs. used      2021-07-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .37586  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 07:13:18  

Additional Information
 Jupiter MOID = 2.07071 au 
 T_jup = 3.295 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.808734950776008E-16 -4.679734531632097E-16 1.018560456292531E-13 -8.150094035082266E-15 1.325063863242592E-14 1.630883161229615E-15
q -4.679734531632097E-16 1.245230653703883E-15 -2.136479266140689E-13 2.279065160720327E-14 -2.505561908356411E-14 -4.602410195737593E-15
tp 1.018560456292531E-13 -2.136479266140689E-13 6.162723954563623E-10 1.915603793628421E-11 8.577299720565031E-11 -3.944023536273579E-12
node -8.150094035082266E-15 2.279065160720327E-14 1.915603793628421E-11 9.492669570476351E-12 -5.350194562540914E-12 -1.383105693550545E-12
peri 1.325063863242592E-14 -2.505561908356411E-14 8.577299720565031E-11 -5.350194562540914E-12 2.034738244358039E-11 6.002153235137623E-13
i 1.630883161229615E-15 -4.602410195737593E-15 -3.944023536273579E-12 -1.383105693550545E-12 6.002153235137623E-13 3.350147592826166E-13

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.91   n/a MPO636076  
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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