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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1380458048483925 1.2148e-08  
a 3.158339163002118 1.2769e-08 au
q 2.722343691261292 4.2404e-08 au
i 10.10989200880172 6.9023e-07 deg
node 230.6041681940335 4.1974e-06 deg
peri 115.445269213534 8.8733e-06 deg
M 158.5455553216262 1.0816e-05 deg
tp 2458297.603133298585
(2018-Jun-28.10313330)		 5.9129e-05 TDB
period 2050.154426298019
5.61		 1.2433e-05
3.404e-08		 d
yr
n .1755965284283755 1.0649e-09 deg/d
Q 3.594334634742944 1.4532e-08 au
   Orbit Determination Parameters
   # obs. used (total)      3117  
   data-arc span      36054 days (98.71 yr)  
   first obs. used      1922-06-29  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40488  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:44:50  

Additional Information
 Earth MOID = 1.734 au 
 Jupiter MOID = 1.97294 au 
 T_jup = 3.167 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456658.5 (2014-Jan-01.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1342045242151228 1.1888e-08  
q 2.735762972793761 4.151e-08 au
tp 2456230.696356703480
(2012-Oct-30.19635670)		 5.6644e-05 TDB
node 231.2802699566496 4.215e-06 deg
peri 112.5485431527256 9.1589e-06 deg
i 10.09961332279102 6.8429e-07 deg
   Orbit Determination Parameters
   # obs. used (total)      3117  
   data-arc span      36054 days (98.71 yr)  
   first obs. used      1922-06-29  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40488  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:44:50  

Additional Information
 Jupiter MOID = 1.97294 au 
 T_jup = 3.167 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.413281706112729E-16 -4.764186873414153E-16 1.847305021799913E-14 -9.890969961029557E-16 4.106629892301727E-15 -4.411499847183294E-16
q -4.764186873414153E-16 1.723082829942328E-15 9.140015797938125E-14 3.467794700922639E-15 1.73990660689943E-14 1.275930353463947E-15
tp 1.847305021799913E-14 9.140015797938125E-14 3.208558776808624E-9 6.070093020984774E-12 4.588446814283024E-10 -2.854506706724475E-13
node -9.890969961029557E-16 3.467794700922639E-15 6.070093020984774E-12 1.776620490871011E-11 -1.660992641030782E-11 -2.27785621437667E-12
peri 4.106629892301727E-15 1.73990660689943E-14 4.588446814283024E-10 -1.660992641030782E-11 8.388468816678455E-11 2.237977509410156E-12
i -4.411499847183294E-16 1.275930353463947E-15 -2.854506706724475E-13 -2.27785621437667E-12 2.237977509410156E-12 4.682509174940643E-13

[ 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 23:10 00:02 Jupiter 1.94896251776082 1.94896235020328 1.94896268531859 2.71726897368267 2.55232192040262 2422210.465053011 1.79315477427055 56.2175467770504 6.01948056418855 -63.5051288788709 5572829.30272636 T 45 CATAB v2.0f-lin.ifort 2021-Apr-12 11:45:41 2021-Apr-12 11:45
1930-Mar-29 02:31 00:01 Jupiter 1.95892709654581 1.95892681862569 1.95892737446705 4.29519849420205 4.19332183815014 2426064.605150069 1.43589294150229 97.2359636642145 7.64601300424421 -85.7030371187439 11245288.6106952 T 45 CATAB v2.0f-lin.ifort 2021-Apr-12 11:45:41 2021-Apr-12 11:45
2015-Feb-26 05:31 < 00:01 Jupiter 1.97952385466466 1.97952372542091 1.97952398390841 2.19323989453043 1.98859677766009 2457079.730191900 0.0686460094331396 8.23637478997009 4.67535423615827 -83.2997621001014 10511025.0372544 T 45 CATAB v2.0f-lin.ifort 2021-Apr-12 11:45:41 2021-Apr-12 11:45
2025-Aug-26 01:45 < 00:01 Jupiter 1.96539105820603 1.96539088728624 1.96539122912583 3.72835357846426 3.61091159069012 2460913.572794258 0.241668714996738 13.2806896185494 7.62938389773071 -87.1255832720534 12807611.619107 T 45 CATAB v2.0f-lin.ifort 2021-Apr-12 11:45:41 2021-Apr-12 11:45
2110-Aug-20 20:48 00:02 Jupiter 1.98629751877466 1.98629740544721 1.98629763210211 2.12909910373042 1.91838403200714 2491953.366727077 1.88020259076511 80.7931555989713 1.74545465393088 78.8948105428009 9815604.01522839 T 45 CATAB v2.0f-lin.ifort 2021-Apr-12 11:45:41 2021-Apr-12 11:45
2121-Feb-01 15:09 00:02 Jupiter 1.98030892521616 1.98030875628646 1.98030909414597 3.04768893604768 2.90395644350339 2495771.131127360 2.03154299410071 25.0257118226254 8.17366351919478 -39.5886761573434 2634060.21582497 T 45 CATAB v2.0f-lin.ifort 2021-Apr-12 11:45:41 2021-Apr-12 11:45

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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