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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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457412.5 (2016-Jan-25.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1827437199819684 9.516e-09  
q 1.8463745019888 2.2328e-08 au
tp 2457829.464607900621
(2017-Mar-16.96460790)
1.8261e-05 TDB
node 353.6763851975517 6.9368e-06 deg
peri 326.1713717491059 8.4028e-06 deg
i 4.805770564870934 6.9196e-07 deg
  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
 Jupiter MOID = 2.63839 au 
 T_jup = 3.595 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.055374030653703E-17 -2.085115804372996E-16 -2.252773856739433E-14 -3.006584802172329E-14 2.338194732131072E-14 2.578105798864452E-15
q -2.085115804372996E-16 4.985560802983463E-16 2.111541749742852E-14 6.919191519257195E-14 -6.327912192342967E-14 -5.900464935501275E-15
tp -2.252773856739433E-14 2.111541749742852E-14 3.334578429329138E-10 -1.056266684654865E-11 9.466835111961138E-11 7.274584507836668E-13
node -3.006584802172329E-14 6.919191519257195E-14 -1.056266684654865E-11 4.811919275527415E-11 -4.832407735165215E-11 1.05274377363557E-12
peri 2.338194732131072E-14 -6.327912192342967E-14 9.466835111961138E-11 -4.832407735165215E-11 7.060779794808944E-11 -1.098213371493902E-12
i 2.578105798864452E-15 -5.900464935501275E-15 7.274584507836668E-13 1.05274377363557E-12 -1.098213371493902E-12 4.788148059387564E-13

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

[ 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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