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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 ]

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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .137626255440007 4.0686e-08  
a 3.158224063412821 1.4814e-08 au
q 2.723569511724791 1.2993e-07 au
i 10.11164827298925 4.251e-06 deg
node 230.6238008749797 2.4142e-05 deg
peri 115.3592100209133 2.7943e-05 deg
M 53.30810630383307 1.393e-05 deg
tp 2458296.933678156718
(2018-Jun-27.43367816)
7.9221e-05 TDB
period 2050.042356423449
5.61
1.4424e-05
3.949e-08
d
yr
n .1756061277817031 1.2355e-09 deg/d
Q 3.59287861510085 1.6853e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2445  
   data-arc span      35475 days (97.13 yr)  
   first obs. used      1922-06-29  
   last obs. used      2019-08-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4388  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-23 19:13:50  

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

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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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