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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 
[ 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 9.77   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

[ 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 1.94896226967043 1.94896181489217 1.94896272444869 2.71727087104339 2.55232391776679 2422210.464612886 1.84007683530059 99.242410974681 28.2978795808105 -79.9341695953509 2416061.13565627 T 43 CATAB v2.0f-lin.ifort 2021-Feb-24 00:51:34 2021-Feb-24 00:51
1930-Mar-29 02:31 00:01 Jupiter 1.95892704710905 1.95892664790611 1.95892744631244 4.29519866015552 4.19332200496356 2426064.604843096 1.47334282689798 107.206931517066 15.9059827364836 -87.1816595280598 3364863.80329111 T 43 CATAB v2.0f-lin.ifort 2021-Feb-24 00:51:34 2021-Feb-24 00:51
2015-Feb-26 05:31 < 00:01 Jupiter 1.97952369447775 1.97952322836871 1.9795241605868 2.19324061217169 1.98859755055169 2457079.730156512 0.246688590632483 65.4629724895489 20.9818395323798 88.555787241342 3228083.32269767 T 43 CATAB v2.0f-lin.ifort 2021-Feb-24 00:51:34 2021-Feb-24 00:51
2025-Aug-26 01:45 < 00:01 Jupiter 1.96539091207643 1.9653905323726 1.96539129178025 3.72835329360394 3.61091128703162 2460913.572786891 0.322116242210394 58.3424526558862 16.7006387178981 87.5002944337236 3922918.50556023 T 43 CATAB v2.0f-lin.ifort 2021-Feb-24 00:51:34 2021-Feb-24 00:51
2110-Aug-20 20:47 00:02 Jupiter 1.98629741358845 1.98629694553216 1.98629788164463 2.12909851950637 1.91838337061253 2491953.366198436 1.98709563398228 90.452282547051 14.8081649982748 77.1778273358278 2804681.15187845 T 43 CATAB v2.0f-lin.ifort 2021-Feb-24 00:51:34 2021-Feb-24 00:51
2121-Feb-01 15:08 00:02 Jupiter 1.98030873865118 1.98030831868344 1.98030915861893 3.04769087006189 2.90395845855253 2495771.130620927 2.1241295023452 66.5426548448205 26.4363813266133 -89.5746257185367 1685846.22021562 T 43 CATAB v2.0f-lin.ifort 2021-Feb-24 00:51:34 2021-Feb-24 00:51

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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