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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1831394885636119 9.5305e-09  
a 2.258203538358214 5.2698e-09 au
q 1.844637297270751 2.2372e-08 au
i 4.805994141015706 6.9205e-07 deg
node 353.6323205362326 6.9372e-06 deg
peri 326.124453192061 8.4017e-06 deg
M 38.26680839133893 4.928e-06 deg
tp 2459068.746308185440
(2020-Aug-07.24630819)
1.7028e-05 TDB
period 1239.490071086695
3.39
4.3388e-06
1.188e-08
d
yr
n .2904420199867983 1.0167e-09 deg/d
Q 2.671769779445675 6.2349e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2520  
   data-arc span      16212 days (44.39 yr)  
   first obs. used      1976-09-24  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4623  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:05:56  

Additional Information
 Earth MOID = .832327 au 
 Jupiter MOID = 2.63839 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 14.25   n/a E2021B10  
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

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