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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1376262593833235 3.9595e-08  
a 3.158224062132515 1.4501e-08 au
q 2.723569498166812 1.2588e-07 au
i 10.11164836607113 4.1868e-06 deg
node 230.6238000890367 2.3597e-05 deg
peri 115.3592116337565 2.7401e-05 deg
M 53.30810592828393 1.3884e-05 deg
tp 2458296.933680479899
(2018-Jun-27.43368048)
7.8922e-05 TDB
period 2050.042355176856
5.61
1.4119e-05
3.866e-08
d
yr
n .175606127888486 1.2094e-09 deg/d
Q 3.592878626098218 1.6497e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2553  
   data-arc span      35581 days (97.42 yr)  
   first obs. used      1922-06-29  
   last obs. used      2019-11-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43151  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 20:15:24  

Additional Information
 Earth MOID = 1.73605 au 
 Jupiter MOID = 1.97138 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-January); 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 1.94896222852172 1.9489617389499 1.94896271809354 2.7172705076633 2.55232352730775 2422210.464573562 1.91422147754526 104.318350961041 30.6029736727233 -80.6732056036387 2363690.9541349 T 36 CATAB v2.0f-lin.ifort 2019-Dec-03 20:15:39 2019-Dec-03 20:15
1930-Mar-29 02:31 00:02 Jupiter 1.95892695449966 1.9589265412078 1.95892736779173 4.29519844149569 4.19332177611661 2426064.604816798 1.53144932385841 110.999239539674 17.1153092909709 -88.0190278162357 3122988.12192314 T 36 CATAB v2.0f-lin.ifort 2019-Dec-03 20:15:39 2019-Dec-03 20:15
2015-Feb-26 05:32 < 00:01 Jupiter 1.97952368062012 1.97952318204485 1.97952417919551 2.19323988015644 1.9885967416997 2457079.730253248 0.280696735521823 68.2805351159091 22.8332135984534 87.6133442568294 3156975.16298477 T 36 CATAB v2.0f-lin.ifort 2019-Dec-03 20:15:39 2019-Dec-03 20:15
2025-Aug-26 01:45 < 00:01 Jupiter 1.96539082993475 1.96539041735389 1.9653912425156 3.72835267821287 3.61091064663725 2460913.572850513 0.374103898797167 64.720145442441 17.8236352323874 87.5417064761848 3519903.559477 T 36 CATAB v2.0f-lin.ifort 2019-Dec-03 20:15:39 2019-Dec-03 20:15
2110-Aug-20 20:48 00:02 Jupiter 1.98629740507024 1.98629690958827 1.9862979005522 2.12909854638704 1.9183833994925 2491953.366409943 2.14229330698533 98.588678300121 15.1515749222286 77.339319249462 2664375.88852664 T 36 CATAB v2.0f-lin.ifort 2019-Dec-03 20:15:39 2019-Dec-03 20:15
2121-Feb-01 15:08 00:02 Jupiter 1.98030868354748 1.98030823112417 1.9803091359709 3.0476896724086 2.90395719752251 2495771.130795822 2.28446182960959 70.7183746667812 27.7181382577315 88.6530267548558 1526534.95410448 T 36 CATAB v2.0f-lin.ifort 2019-Dec-03 20:15:39 2019-Dec-03 20:15

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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