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11928 Akimotohiro (1993 BT2)
Classification: Main-belt Asteroid          SPK-ID: 2011928
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2071913551227157 3.7385e-08  
a 2.638097465325793 8.4031e-09 au
q 2.09150647653914 9.6701e-08 au
i 5.430362057585861 3.685e-06 deg
node 328.6438364447354 3.2437e-05 deg
peri 195.6228960935856 3.3142e-05 deg
M 116.6331681202151 7.6879e-06 deg
tp 2458493.445952634879
(2019-Jan-09.94595263)
3.2475e-05 TDB
period 1565.073297702916
4.28
7.4778e-06
2.047e-08
d
yr
n .2300211757036414 1.099e-09 deg/d
Q 3.184688454112445 1.0144e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2367  
   data-arc span      23973 days (65.63 yr)  
   first obs. used      1955-03-24  
   last obs. used      2020-11-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47851  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:47:28  

Additional Information
 Earth MOID = 1.09998 au 
 Jupiter MOID = 1.80485 au 
 T_jup = 3.359 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457325.5 (2015-Oct-30.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2067404615893849 3.7309e-08  
q 2.091018693452675 9.6262e-08 au
tp 2456928.068974804957
(2014-Sep-27.56897481)
3.0514e-05 TDB
node 328.7452553385308 3.2487e-05 deg
peri 195.1600196226029 3.32e-05 deg
i 5.427131900039218 3.6829e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2367  
   data-arc span      23973 days (65.63 yr)  
   first obs. used      1955-03-24  
   last obs. used      2020-11-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47851  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:47:28  

Additional Information
 Jupiter MOID = 1.80485 au 
 T_jup = 3.359 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.391937593287101E-15 -3.583894599339009E-15 2.76163118722066E-13 6.78126409209817E-15 3.672649738954724E-14 -1.273329541581815E-15
q -3.583894599339009E-15 9.266356850333774E-15 -6.912220764171795E-13 -1.713162945593433E-14 -8.825290257209283E-14 3.314118449197254E-15
tp 2.76163118722066E-13 -6.912220764171795E-13 9.3110218263187E-10 1.249273326897781E-12 2.169900467971918E-10 -2.72170981748333E-13
node 6.78126409209817E-15 -1.713162945593433E-14 1.249273326897781E-12 1.055407575698729E-9 -1.050138249288019E-9 2.200999089026474E-11
peri 3.672649738954724E-14 -8.825290257209283E-14 2.169900467971918E-10 -1.050138249288019E-9 1.102231622161086E-9 -2.198832482576398E-11
i -1.273329541581815E-15 3.314118449197254E-15 -2.72170981748333E-13 2.200999089026474E-11 -2.198832482576398E-11 1.356343669293341E-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 13.3   n/a MPO389703  
diameter diameter 8.040 km 0.161 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 2.95683 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.177   0.040 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

11928 Akimotohiro           Discovered 1993 Jan. 23 by K. Endate and K. Watanabe at Kitami.
Hiroyuki Akimoto (b. 1967) is editor-in-chief of the Japanese monthly astronomical magazine Gekkan Tenmon Guide. He has edited many books on astronomy.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030910/MPCPages.arcLast Updated: 2003-10-02

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