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21033 Akahirakiyozo (1989 UM)
Classification: Main-belt Asteroid          SPK-ID: 2021033
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1835021334521363 9.5896e-09  
a 2.298765268238356 5.911e-09 au
q 1.876936937210945 2.3499e-08 au
i 1.689829450969743 5.6812e-07 deg
node 300.0978620765005 8.6378e-06 deg
peri 22.721964226788 9.5503e-06 deg
M 27.13992988066463 5.6593e-06 deg
tp 2459104.527548695149
(2020-Sep-12.02754869)
1.9958e-05 TDB
period 1273.035067579933
3.49
4.9102e-06
1.344e-08
d
yr
n .2827887535607073 1.0907e-09 deg/d
Q 2.720593599265766 6.9957e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2609  
   data-arc span      11433 days (31.30 yr)  
   first obs. used      1989-10-21  
   last obs. used      2021-02-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4743  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:36:53  

Additional Information
 Earth MOID = .862665 au 
 Jupiter MOID = 2.59245 au 
 T_jup = 3.570 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.37   n/a E2021B10  
diameter diameter 3.121 km 0.437 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 17.291 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.415   0.149 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

21033 Akahirakiyozo           Discovered 1989 Oct. 21 by K. Endate and K. Watanabe at Kitami.
Kiyozo Akahira (b. 1941) is a science historian and an amateur astronomer. He has been a high school teacher of physics for more than 35 years.
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 2017-03-12Last Updated: 2017-03-14

Alternate Designations
 1989 UM = 1997 XR4 = 2000 VS37 = 2000 WF101 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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