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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1378959375249174 3.8143e-08  
a 3.158532344679323 1.4169e-08 au
q 2.722983565806992 1.2051e-07 au
i 10.11009372442024 4.0398e-06 deg
node 230.6158490018003 2.2992e-05 deg
peri 115.4047802388066 2.6719e-05 deg
M 123.4747841597983 1.3835e-05 deg
tp 2458297.262219331887
(2018-Jun-27.76221933)		 7.8247e-05 TDB
period 2050.342527530799
5.61		 1.3797e-05
3.777e-08		 d
yr
n .1755804189622616 1.1815e-09 deg/d
Q 3.594081123551653 1.6123e-08 au
   Orbit Determination Parameters
   # obs. used (total)      2732  
   data-arc span      35729 days (97.82 yr)  
   first obs. used      1922-06-29  
   last obs. used      2020-04-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .421  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:16:25  

Additional Information
 Earth MOID = 1.73634 au 
 Jupiter MOID = 1.9731 au 
 T_jup = 3.167 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456171.5 (2012-Sep-01.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .134054823490203 3.7365e-08  
q 2.734295821938508 1.1696e-07 au
tp 2456229.172774152319
(2012-Oct-28.67277415)		 8.1995e-05 TDB
node 231.2837649575094 2.3017e-05 deg
peri 112.1881333785798 2.7172e-05 deg
i 10.10330806603925 4.0347e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      2732  
   data-arc span      35729 days (97.82 yr)  
   first obs. used      1922-06-29  
   last obs. used      2020-04-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .421  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:16:25  

Additional Information
 Jupiter MOID = 1.9731 au 
 T_jup = 3.167 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.396158213852711E-15 -4.346993952114865E-15 2.965407353814237E-13 -6.663228828539267E-16 3.791968253996892E-14 4.844957630118312E-16
q -4.346993952114865E-15 1.36797002583146E-14 -9.095854195386801E-13 1.280478033377908E-15 -1.179585254050625E-13 -5.592763777120111E-16
tp 2.965407353814237E-13 -9.095854195386801E-13 6.723204479932126E-9 -1.326302712015353E-11 1.211432002693949E-9 1.380056261493056E-12
node -6.663228828539267E-16 1.280478033377908E-15 -1.326302712015353E-11 5.297645313735323E-10 -5.230283190097568E-10 -1.137346958863182E-11
peri 3.791968253996892E-14 -1.179585254050625E-13 1.211432002693949E-9 -5.230283190097568E-10 7.383252582455577E-10 1.128399421585056E-11
i 4.844957630118312E-16 -5.592763777120111E-16 1.380056261493056E-12 -1.137346958863182E-11 1.128399421585056E-11 1.627879581068421E-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. 2019-August); 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 1.94896229430171 1.94896181813294 1.94896277047058 2.71727080854983 2.55232385338649 2422210.464651309 1.87267017815107 103.451721092638 29.4711446328822 -80.5658460691625 2401475.6063417 T 39 CATAB v2.0f-lin.ifort 2020-May-20 01:16:40 2020-May-20 01:16
1930-Mar-29 02:31 00:02 Jupiter 1.95892706379258 1.9589266557985 1.958927471787 4.29519866374447 4.19332200951789 2426064.604873545 1.49933464001543 108.667631890577 16.6257234168414 -87.5717838680423 3208996.54948821 T 39 CATAB v2.0f-lin.ifort 2020-May-20 01:16:40 2020-May-20 01:16
2015-Feb-26 05:31 < 00:01 Jupiter 1.97952371178871 1.97952322627295 1.97952419730446 2.19324070549987 1.98859765536579 2457079.730141611 0.264706296802274 67.7145840429289 21.6818504191949 87.5772014710768 3184713.40203463 T 39 CATAB v2.0f-lin.ifort 2020-May-20 01:16:40 2020-May-20 01:16
2025-Aug-26 01:45 < 00:01 Jupiter 1.96539093644564 1.9653905367915 1.96539133609978 3.72835343776179 3.61091143735796 2460913.572772713 0.346346682574615 62.2965208049666 17.3705154664834 88.0421460051235 3622999.0955553 T 39 CATAB v2.0f-lin.ifort 2020-May-20 01:16:40 2020-May-20 01:16
2110-Aug-20 20:47 00:02 Jupiter 1.98629742599562 1.98629694070145 1.9862979112898 2.12909849516935 1.91838334499083 2491953.366133780 2.05995316586464 94.2282062029415 15.0957002734555 77.2010109937238 2763298.92292459 T 39 CATAB v2.0f-lin.ifort 2020-May-20 01:16:40 2020-May-20 01:16
2121-Feb-01 15:08 00:02 Jupiter 1.98030876150015 1.98030832250241 1.98030920049789 3.04769115228925 2.90395875644827 2495771.130560137 2.19668160389331 69.9234808275447 26.7428633292193 89.2767507788233 1582831.24191195 T 39 CATAB v2.0f-lin.ifort 2020-May-20 01:16:40 2020-May-20 01:16

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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