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21022 Ike (1989 CR)
Classification: Main-belt Asteroid          SPK-ID: 2021022
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
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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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2545100080303233 5.2776e-08  
a 2.56216769835534 1.1986e-08 au
q 1.910070376871887 1.3908e-07 au
i 25.01380447246373 4.9802e-06 deg
node 110.7369697515323 1.2443e-05 deg
peri 117.0671773769607 1.6567e-05 deg
M 151.0886815261751 1.3633e-05 deg
tp 2458371.806189175912
5.3998e-05 TDB
period 1497.992898015074
n .2403215665955563 1.6864e-09 deg/d
Q 3.214265019838793 1.5037e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1616  
   data-arc span      11308 days (30.96 yr)  
   first obs. used      1989-02-02  
   last obs. used      2020-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40713  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 23:17:17  

Additional Information
 Earth MOID = 1.00215 au 
 Jupiter MOID = 2.20544 au 
 T_jup = 3.261 
[ 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 13.2   n/a MPO395205  
diameter diameter 8.111 km 0.073 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 7.550 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2006) Minor Planet Bull. 33, 85-88.]
geometric albedo albedo 0.203   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

21022 Ike           Discovered 1989 Feb. 2 by T. Seki at Geisei.
Koichi Ike (b. 1925) was born in Tosa city in Kochi prefecture. He took an interest in astronomy by reading science magazines when he was a boy in primary school. He is a long-time friend and assistant of the discoverer, who worked together with Ike in astronomical research and observation.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040107/MPCPages.arcLast Updated: 2004-01-07

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
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
2015-Jan-24 17:30 < 00:01 Vesta 0.0380142618090356 0.0380109999547057 0.0380175237908542 7.52353777239541 7.52353735636418 2457047.229219452 0.517939360642304 198.818716048105 47.1368765561889 36.3888302333732 75092.5641788269 T 31 CATAB v2.0f-lin.ifort 2020-Feb-22 23:17:33 2020-Feb-22 23:17

Alternate Designations
 1989 CR = 1994 NT = 1998 MQ5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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