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 ]

[ hide orbit diagram ]
Orbit Diagram
[ switch to new HTML5 viewer ]

Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet 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. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet is not working, here are some notes that might help.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


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 
[ 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

[ 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Oct-26 08:05 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin