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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1378959492651649 3.9509e-08  
a 3.158532352667717 1.4598e-08 au
q 2.722983535611868 1.2564e-07 au
i 10.11009587875828 4.1793e-06 deg
node 230.6158410689065 2.356e-05 deg
peri 115.4047684886013 2.7343e-05 deg
M 123.4747974471042 1.3896e-05 deg
tp 2458297.262140987531
(2018-Jun-27.76214099)
7.872e-05 TDB
period 2050.342535309228
5.61
1.4214e-05
3.892e-08
d
yr
n .1755804182961584 1.2172e-09 deg/d
Q 3.594081169723566 1.6611e-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 = 1.73634 au 
 Jupiter MOID = 1.9731 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-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

[ show close-approach data ]
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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