Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1380458045775399 1.2139e-08  
a 3.15833916362828 1.2732e-08 au
q 2.72234369265646 4.2344e-08 au
i 10.10989200248133 6.9007e-07 deg
node 230.6041682118949 4.1971e-06 deg
peri 115.4452692270129 8.873e-06 deg
M 158.5455551650365 1.0814e-05 deg
tp 2458297.603133921835
(2018-Jun-28.10313392)
5.9121e-05 TDB
period 2050.154426907704
5.61
1.2397e-05
3.394e-08
d
yr
n .1755965283761557 1.0618e-09 deg/d
Q 3.5943346346001 1.4489e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3133  
   data-arc span      36062 days (98.73 yr)  
   first obs. used      1922-06-29  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40436  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:03:45  

Additional Information
 Earth MOID = 1.734 au 
 Jupiter MOID = 1.97294 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 9.77   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 1.94896251623339 1.94896234887471 1.9489626835923 2.71726903544907 2.55232198602732 2422210.465035503 1.78812165444246 56.0630042128424 6.0176960241182 -63.5104721833113 5573071.07863731 T 46 CATAB v2.0g-lin.ifort 2021-May-03 19:05:01 2021-May-03 19:05
1930-Mar-29 02:31 00:01 Jupiter 1.95892709865187 1.95892682100077 1.95892737630408 4.29519858188847 4.19332192807776 2426064.605132065 1.43185344480122 96.9745423636872 7.64365174272049 -85.694872953496 11248006.008451 T 46 CATAB v2.0g-lin.ifort 2021-May-03 19:05:01 2021-May-03 19:05
2015-Feb-26 05:31 < 00:01 Jupiter 1.97952385460745 1.97952372537653 1.97952398383837 2.1932399328896 1.98859681996052 2457079.730183833 0.0686249838031911 8.23489252241549 4.67334339964049 -83.2755762235937 10511895.0480278 T 46 CATAB v2.0g-lin.ifort 2021-May-03 19:05:01 2021-May-03 19:05
2025-Aug-26 01:45 < 00:01 Jupiter 1.9653910577513 1.96539088684213 1.96539122866048 3.72835359885818 3.61091161171972 2460913.572794160 0.241027574955725 13.2630590577581 7.62912081732094 -87.1113472078353 12813787.6709578 T 46 CATAB v2.0g-lin.ifort 2021-May-03 19:05:01 2021-May-03 19:05
2110-Aug-20 20:48 00:02 Jupiter 1.98629751904999 1.98629740574975 1.98629763235023 2.12909911537029 1.91838404495634 2491953.366744668 1.87484803878593 80.5549834744953 1.74544019187346 78.895170752805 9816403.20075594 T 46 CATAB v2.0g-lin.ifort 2021-May-03 19:05:01 2021-May-03 19:05
2121-Feb-01 15:09 00:02 Jupiter 1.98030892531126 1.98030875639181 1.98030909423072 3.047688897488 2.90395640304226 2495771.131147189 2.02576440333032 24.9750768363887 8.17072388481376 -39.6127467933035 2638834.85380817 T 46 CATAB v2.0g-lin.ifort 2021-May-03 19:05:01 2021-May-03 19:05

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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-May-15 18:56 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin