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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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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
(2018-Sep-10.30618918)
5.3998e-05 TDB
period 1497.992898015074
4.10
1.0512e-05
2.878e-08
d
yr
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456978.5 (2014-Nov-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2539915171995919 5.2855e-08  
q 1.912077670956025 1.3932e-07 au
tp 2456873.335374745215
(2014-Aug-03.83537475)
4.8724e-05 TDB
node 110.7709916088429 1.2446e-05 deg
peri 117.0829798098431 1.6592e-05 deg
i 25.00559933169329 4.9788e-06 deg
  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
 Jupiter MOID = 2.20544 au 
 T_jup = 3.261 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.793694481450781E-15 -7.350936208913426E-15 -1.217529156297811E-12 5.311280144724866E-16 -2.021775975534562E-13 -1.724246988396028E-14
q -7.350936208913426E-15 1.940954018709866E-14 3.309828162511716E-12 -1.906940346929653E-15 5.560829329501726E-13 4.617143373858765E-14
tp -1.217529156297811E-12 3.309828162511716E-12 2.374076043370254E-9 -4.049190649890513E-12 5.59520421131516E-10 1.807192691628161E-11
node 5.311280144724866E-16 -1.906940346929653E-15 -4.049190649890513E-12 1.549094383756161E-10 -1.411714113314795E-10 7.596519114588206E-12
peri -2.021775975534562E-13 5.560829329501726E-13 5.59520421131516E-10 -1.411714113314795E-10 2.752897682089415E-10 -3.230238327017929E-12
i -1.724246988396028E-14 4.617143373858765E-14 1.807192691628161E-11 7.596519114588206E-12 -3.230238327017929E-12 2.478875637636271E-11

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. 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] (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

[ show close-approach data ]
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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