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979 Ilsewa (A922 MA)
Classification: Main-belt Asteroid          SPK-ID: 2000979
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1380457789245514 3.8066e-08  
a 3.15833915253616 1.3691e-08 au
q 2.722343764116398 1.201e-07 au
i 10.10988522184711 3.813e-06 deg
node 230.6041826530355 2.2964e-05 deg
peri 115.4452559475683 2.6258e-05 deg
M 158.545558741825 1.3528e-05 deg
tp 2458297.603118308952
(2018-Jun-28.10311831)
7.5888e-05 TDB
period 2050.154416107459
5.61
1.3331e-05
3.65e-08
d
yr
n .175596529301201 1.1418e-09 deg/d
Q 3.594334540955921 1.5581e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2949  
   data-arc span      36004 days (98.57 yr)  
   first obs. used      1922-06-29  
   last obs. used      2021-01-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41005  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:51:27  

Additional Information
 Earth MOID = 1.734 au 
 Jupiter MOID = 1.97294 au 
 T_jup = 3.167 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456402.5 (2013-Apr-20.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1340002701646784 3.7317e-08  
q 2.734393713647278 1.1669e-07 au
tp 2456229.453513311290
(2012-Oct-28.95351331)
7.8427e-05 TDB
node 231.2832822069764 2.2987e-05 deg
peri 112.2539088032148 2.6669e-05 deg
i 10.1032779785718 3.8074e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2949  
   data-arc span      36004 days (98.57 yr)  
   first obs. used      1922-06-29  
   last obs. used      2021-01-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41005  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:51:27  

Additional Information
 Jupiter MOID = 1.97294 au 
 T_jup = 3.167 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.392577783023111E-15 -4.332475898763447E-15 2.809640936677059E-13 -3.939794581330056E-16 3.453207116880415E-14 7.549390283008143E-16
q -4.332475898763447E-15 1.361574435771013E-14 -8.041533353748935E-13 3.24242725359168E-16 -9.486151006654511E-14 -1.580419645270334E-15
tp 2.809640936677059E-13 -8.041533353748935E-13 6.150763929671609E-9 -1.078706321130737E-11 1.089941529825214E-9 2.013997419503771E-12
node -3.939794581330056E-16 3.24242725359168E-16 -1.078706321130737E-11 5.283900262875266E-10 -5.211585016002745E-10 -1.166615512705618E-11
peri 3.453207116880415E-14 -9.486151006654511E-14 1.089941529825214E-9 -5.211585016002745E-10 7.112199007284707E-10 1.17227792733946E-11
i 7.549390283008143E-16 -1.580419645270334E-15 2.013997419503771E-12 -1.166615512705618E-11 1.17227792733946E-11 1.449631266564458E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.77   n/a E2021B10  
diameter diameter 35.741 km 0.602 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 42.61 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Ferrero, A. (2013) Minor Planet Bull. 40, 31-32.]
[Stephens, R.D. (2013) Minor Planet Bull. 40, 34-35.]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
geometric albedo albedo 0.166   0.047 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

979 Ilsewa (A922 MA)          Discovered 1922-Jun-29 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A922 MA = 1932 EG1 = 1951 TW = 1966 HO = A916 KD = A923 XB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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