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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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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.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2545100076253941 5.2673e-08  
a 2.562167698160343 1.1922e-08 au
q 1.910070377764016 1.3881e-07 au
i 25.0138046473052 4.4518e-06 deg
node 110.7369703795897 1.1789e-05 deg
peri 117.0671780126645 1.5312e-05 deg
M 151.0886807518754 1.318e-05 deg
tp 2458371.806192469615
(2018-Sep-10.30619247)		 5.1899e-05 TDB
period 1497.992897844065
4.10		 1.0456e-05
2.863e-08		 d
yr
n .2403215666229911 1.6774e-09 deg/d
Q 3.214265018556671 1.4957e-08 au
   Orbit Determination Parameters
   # obs. used (total)      1763  
   data-arc span      11608 days (31.78 yr)  
   first obs. used      1989-02-02  
   last obs. used      2020-11-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39902  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 03:15:29  

Additional Information
 Earth MOID = 1.00215 au 
 Jupiter MOID = 2.20544 au 
 T_jup = 3.261 
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[ 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] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 7.550 h n/a LCDB (Rev. 2020-October); 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] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

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

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Alternate Designations
 1989 CR = 1994 NT = 1998 MQ5 
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