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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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1376262594316377 3.9504e-08  
a 3.158224062172135 1.4474e-08 au
q 2.723569498048392 1.2554e-07 au
i 10.11164837686599 4.18e-06 deg
node 230.6238000150051 2.3553e-05 deg
peri 115.3592117213529 2.7355e-05 deg
M 53.30810591264287 1.388e-05 deg
tp 2458296.933680563255
(2018-Jun-27.43368056)
7.8892e-05 TDB
period 2050.042355215433
5.61
1.4093e-05
3.858e-08
d
yr
n .1756061278851815 1.2072e-09 deg/d
Q 3.592878626295878 1.6466e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2561  
   data-arc span      35587 days (97.43 yr)  
   first obs. used      1922-06-29  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43088  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:51:30  

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 1.94896222913333 1.94896174023564 1.94896271803101 2.71727033384174 2.5523233423062 2422210.464594327 1.91163930651461 104.278594526974 30.5433429508405 -80.6767171141563 2366014.94499977 T 37 CATAB v2.0f-lin.ifort 2019-Dec-13 20:51:46 2019-Dec-13 20:51
1930-Mar-29 02:31 00:02 Jupiter 1.9589269546106 1.95892654161806 1.95892736760336 4.2951984931678 4.19332182904993 2426064.604812534 1.52945734127979 110.860853266427 17.0874030029046 -87.9932623909757 3126720.3115794 T 37 CATAB v2.0f-lin.ifort 2019-Dec-13 20:51:46 2019-Dec-13 20:51
2015-Feb-26 05:32 < 00:01 Jupiter 1.97952368090211 1.97952318295551 1.97952417884872 2.19323987069365 1.98859673129376 2457079.730255196 0.279714657325142 68.2457947089248 22.7690199118137 87.5951510004776 3158784.21531741 T 37 CATAB v2.0f-lin.ifort 2019-Dec-13 20:51:46 2019-Dec-13 20:51
2025-Aug-26 01:45 < 00:01 Jupiter 1.96539083024305 1.965390418382 1.9653912421041 3.72835257163814 3.61091053661499 2460913.572860519 0.37244408965657 64.5993439919797 17.7965981389571 87.5653917179265 3525706.35655013 T 37 CATAB v2.0f-lin.ifort 2019-Dec-13 20:51:46 2019-Dec-13 20:51
2110-Aug-20 20:48 00:02 Jupiter 1.98629740526279 1.98629691027943 1.98629790024616 2.1290985400392 1.91838339246896 2491953.366408632 2.13723611336249 98.3274856909908 15.1456019067645 77.3309119796088 2669789.0249896 T 37 CATAB v2.0f-lin.ifort 2019-Dec-13 20:51:46 2019-Dec-13 20:51
2121-Feb-01 15:08 00:02 Jupiter 1.98030868411375 1.98030823238019 1.98030913584736 3.04768969594662 2.90395722226767 2495771.130794825 2.27905976080645 70.6914614330512 27.6600850416686 88.6771680796086 1529860.04440112 T 37 CATAB v2.0f-lin.ifort 2019-Dec-13 20:51:46 2019-Dec-13 20:51

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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