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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 ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet is not working, here are some notes that might help.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456205.5 (2012-Oct-05.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1340248873291926 3.7314e-08  
q 2.73428765290647 1.1676e-07 au
tp 2456229.214895117577
(2012-Oct-28.71489512)
8.1726e-05 TDB
node 231.2836744095685 2.3e-05 deg
peri 112.1978889266522 2.7121e-05 deg
i 10.10331196111077 4.0124e-06 deg
  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
 Jupiter MOID = 1.9731 au 
 T_jup = 3.167 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.392301088172314E-15 -4.333437443507856E-15 2.857948861537208E-13 -6.098821189768335E-16 3.560064715282624E-14 4.823311138911137E-16
q -4.333437443507856E-15 1.363181708640139E-14 -8.71109798132099E-13 1.104829346812601E-15 -1.096179452611359E-13 -5.69700642165833E-16
tp 2.857948861537208E-13 -8.71109798132099E-13 6.679090135390034E-9 -1.304903381398979E-11 1.201958479333456E-9 1.41158248666347E-12
node -6.098821189768335E-16 1.104829346812601E-15 -1.304903381398979E-11 5.289782724387719E-10 -5.222149712637622E-10 -1.106012184134378E-11
peri 3.560064715282624E-14 -1.096179452611359E-13 1.201958479333456E-9 -5.222149712637622E-10 7.355393284157619E-10 1.09850020727688E-11
i 4.823311138911137E-16 -5.69700642165833E-16 1.41158248666347E-12 -1.106012184134378E-11 1.09850020727688E-11 1.609921486968867E-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 9.7   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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