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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1378959370008077 3.8081e-08  
a 3.158532344840413 1.412e-08 au
q 2.722983567601286 1.2026e-07 au
i 10.11009367375448 4.0174e-06 deg
node 230.615849112636 2.2975e-05 deg
peri 115.4047800541435 2.6672e-05 deg
M 123.474784179998 1.3809e-05 deg
tp 2458297.262219163042
(2018-Jun-27.76221916)
7.8075e-05 TDB
period 2050.342527687656
5.61
1.3749e-05
3.764e-08
d
yr
n .1755804189488292 1.1774e-09 deg/d
Q 3.59408112207954 1.6067e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2780  
   data-arc span      35914 days (98.33 yr)  
   first obs. used      1922-06-29  
   last obs. used      2020-10-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41797  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:23:45  

Additional Information
 Earth MOID = 1.73634 au 
 Jupiter MOID = 1.9731 au 
 T_jup = 3.167 
[ show covariance matrix ]

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 9.7   n/a MPO272640  
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. 2019-August); 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1919-Sep-08 23:09 00:02 Jupiter 1.94896229321714 1.94896181891545 1.94896276751883 2.71727081795786 2.55232386330777 2422210.464649699 1.86915706357549 103.181950654362 29.3414192026007 -80.512068349659 2403141.07278939 T 40 CATAB v2.0f-lin.ifort 2020-Nov-13 04:23:53 2020-Nov-13 04:23
1930-Mar-29 02:31 00:02 Jupiter 1.95892706275008 1.95892665559125 1.95892746990924 4.29519867533231 4.19332202133238 2426064.604870791 1.49656892273797 108.479727146098 16.5572975864827 -87.5269881363145 3223218.50845449 T 40 CATAB v2.0f-lin.ifort 2020-Nov-13 04:23:53 2020-Nov-13 04:23
2015-Feb-26 05:31 < 00:01 Jupiter 1.97952371102049 1.97952322725424 1.97952419478686 2.19324068568695 1.98859763343045 2457079.730147914 0.262895248603914 67.5788283710246 21.5786191955415 87.6494873513623 3186352.54327599 T 40 CATAB v2.0f-lin.ifort 2020-Nov-13 04:23:53 2020-Nov-13 04:23
2025-Aug-26 01:45 < 00:01 Jupiter 1.96539093495319 1.96539053710701 1.96539133279938 3.72835348197153 3.61091148291495 2460913.572769064 0.343643644670314 61.9201579399791 17.3125072734029 88.0468166530875 3644065.03055725 T 40 CATAB v2.0f-lin.ifort 2020-Nov-13 04:23:53 2020-Nov-13 04:23
2110-Aug-20 20:47 00:02 Jupiter 1.98629742587778 1.98629694200737 1.98629790974818 2.12909853704839 1.91838339145667 2491953.366151907 2.05223479810753 93.8110226003942 15.085951044799 77.192818637415 2769888.90307717 T 40 CATAB v2.0f-lin.ifort 2020-Nov-13 04:23:53 2020-Nov-13 04:23
2121-Feb-01 15:08 00:02 Jupiter 1.98030876023313 1.98030832300867 1.9803091974576 3.04769112661758 2.90395872941174 2495771.130566742 2.18875751500291 69.6824366678707 26.6832932770093 89.3917235267408 1590894.13663461 T 40 CATAB v2.0f-lin.ifort 2020-Nov-13 04:23:53 2020-Nov-13 04:23

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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