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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer 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.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1378959384656455 3.8068e-08  
a 3.15853234448464 1.4089e-08 au
q 2.722983562667836 1.202e-07 au
i 10.11009358312685 4.004e-06 deg
node 230.6158494106641 2.2972e-05 deg
peri 115.4047799558039 2.6644e-05 deg
M 123.4747841250677 1.3789e-05 deg
tp 2458297.262219594710
(2018-Jun-27.76221959)		 7.7945e-05 TDB
period 2050.342527341234
5.61		 1.3719e-05
3.756e-08		 d
yr
n .1755804189784949 1.1748e-09 deg/d
Q 3.594081126301445 1.6032e-08 au
   Orbit Determination Parameters
   # obs. used (total)      2799  
   data-arc span      35930 days (98.37 yr)  
   first obs. used      1922-06-29  
   last obs. used      2020-11-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .418  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:57:31  

Additional Information
 Earth MOID = 1.73634 au 
 Jupiter MOID = 1.9731 au 
 T_jup = 3.167 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456223.5 (2012-Oct-23.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1340103552639473 3.7304e-08  
q 2.734286280577332 1.1671e-07 au
tp 2456229.233050864653
(2012-Oct-28.73305086)		 8.1528e-05 TDB
node 231.2835540385033 2.2996e-05 deg
peri 112.2022008984639 2.7091e-05 deg
i 10.10331912856911 3.999e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      2799  
   data-arc span      35930 days (98.37 yr)  
   first obs. used      1922-06-29  
   last obs. used      2020-11-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .418  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:57:31  

Additional Information
 Jupiter MOID = 1.9731 au 
 T_jup = 3.167 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.39161220299739E-15 -4.330859382453153E-15 2.826069605579052E-13 -5.947458980627726E-16 3.492384490447117E-14 4.799127650491398E-16
q -4.330859382453153E-15 1.362194784526292E-14 -8.578877226926443E-13 1.046398111417526E-15 -1.067771489583039E-13 -5.718954903006487E-16
tp 2.826069605579052E-13 -8.578877226926443E-13 6.646851660790192E-9 -1.289261614696307E-11 1.195100785496686E-9 1.433847697736748E-12
node -5.947458980627726E-16 1.046398111417526E-15 -1.289261614696307E-11 5.288169876616056E-10 -5.220251487382698E-10 -1.09829330579188E-11
peri 3.492384490447117E-14 -1.067771489583039E-13 1.195100785496686E-9 -5.220251487382698E-10 7.339273691620525E-10 1.091515857614544E-11
i 4.799127650491398E-16 -5.718954903006487E-16 1.433847697736748E-12 -1.09829330579188E-11 1.091515857614544E-11 1.599188971168026E-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. 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

[ 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 1.94896228976774 1.94896181667705 1.94896276285844 2.71727073588898 2.55232377563373 2422210.464664211 1.86719836717228 102.974077275162 29.2684437251664 -80.4777136906178 2403939.75788253 T 41 CATAB v2.0f-lin.ifort 2020-Dec-18 01:57:39 2020-Dec-18 01:57
1930-Mar-29 02:31 00:02 Jupiter 1.95892706248874 1.95892665587743 1.95892746910039 4.29519860113037 4.19332194531395 2426064.604882828 1.49501184484056 108.383496464617 16.5139760411653 -87.5022092676673 3232037.10323108 T 41 CATAB v2.0f-lin.ifort 2020-Dec-18 01:57:39 2020-Dec-18 01:57
2015-Feb-26 05:31 < 00:01 Jupiter 1.97952370568619 1.97952322300129 1.9795241883711 2.19324065296974 1.98859759676654 2457079.730151479 0.26182021181717 67.4724943476335 21.5287042397814 87.701265988249 3187987.08214623 T 41 CATAB v2.0f-lin.ifort 2020-Dec-18 01:57:39 2020-Dec-18 01:57
2025-Aug-26 01:45 < 00:01 Jupiter 1.96539093402846 1.96539053736181 1.96539133069511 3.72835346591732 3.61091146628244 2460913.572768039 0.342147744073371 61.6897796479917 17.2738231044855 88.0306336706863 3659270.82803966 T 41 CATAB v2.0f-lin.ifort 2020-Dec-18 01:57:39 2020-Dec-18 01:57
2110-Aug-20 20:47 00:02 Jupiter 1.98629742035408 1.98629693738333 1.98629790332484 2.12909850203835 1.91838335198298 2491953.366136717 2.04784763399196 93.5786647380734 15.0750455985613 77.1895880955055 2772629.97299864 T 41 CATAB v2.0f-lin.ifort 2020-Dec-18 01:57:39 2020-Dec-18 01:57
2121-Feb-01 15:08 00:02 Jupiter 1.98030875716687 1.98030832106549 1.98030919326825 3.04769119390001 2.90395879979627 2495771.130548687 2.184338230047 69.5087264508965 26.6592520417681 89.4592383673617 1596318.25277666 T 41 CATAB v2.0f-lin.ifort 2020-Dec-18 01:57:39 2020-Dec-18 01:57

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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