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JPL Small-Body Database Browser
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17544 Kojiroishikawa (1993 RF2)
Classification: Main-belt Asteroid          SPK-ID: 2017544
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1833241183251126 3.6342e-08  
a 2.2580607822653 8.1448e-09 au
q 1.844103780232 8.0952e-08 au
i 4.805610728905636 4.6865e-06 deg
node 353.6588577875546 4.2848e-05 deg
peri 326.2676955031882 4.57e-05 deg
M 223.8675684448409 1.9149e-05 deg
tp 2459069.163325672404
(2020-Aug-07.66332567)
6.725e-05 TDB
period 1239.372538304383
3.39
6.7056e-06
1.836e-08
d
yr
n .290469563326395 1.5716e-09 deg/d
Q 2.6720177842986 9.6379e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1774  
   data-arc span      15568 days (42.62 yr)  
   first obs. used      1976-09-24  
   last obs. used      2019-05-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50411  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 02:31:37  

Additional Information
 Earth MOID = .832904 au 
 Jupiter MOID = 2.63665 au 
 T_jup = 3.595 
[ 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 14.2   n/a MPO384905  
diameter diameter 3.507 km 0.085 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.362   0.067 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

17544 Kojiroishikawa           Discovered 1993 Sept. 15 by K. Endate and K. Watanabe at Kitami.
Kojiro Ishikawa (b. 1947) is a Japanese amateur astronomer who has been very active in popularizing astronomy since he was a high school student. Since 1980 he has visited New Zealand frequently to take photographs of the southern sky.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2016-04-22Last Updated: 2016-04-25

[ show close-approach data ]
Alternate Designations
 1993 RF2 = 1976 SB2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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