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The Minor Planet Observer
and
Palmer Divide Observatory

6859 Datemasamune (2009)

MPC Designation: 1991 CZ
Lightcurves Period (h): 5.330 ± 0.001
Amplitude (mag): 0.06 ± 0.01
Equipment:

 

Filter: C
MagBand: R
Telescope: 0.35m f/9.1 SCT
Camera: SBIG STL-1001E
Exposure: 240

 

Obs. Details

Date              E Mag   Phase  PABL   PABB
2009-06-16 07:00  16.22   27.0  297.2   26.0
2009-06-21 07:00  16.11   25.5  298.0   25.6
2009-06-22 07:00  16.09   25.2  298.2   25.6
2009-06-23 07:00  16.07   24.9  298.3   25.5
2009-06-24 07:00  16.04   24.6  298.5   25.4
2009-07-07 07:00  15.76   20.3  299.8   24.0
2009-07-08 07:00  15.73   19.9  299.9   23.9
2009-07-09 07:00  15.71   19.6  300.0   23.7
2009-07-10 07:00  15.70   19.3  300.1   23.6
2009-07-11 07:00  15.68   18.9  300.1   23.4

Data Points: 202
Discovered: 1991-02-13  Ayashi  M. Koishikawa
Family/Group: Hungaria
Taxonomic Class: ES (Assumed)
Published: MPB 38, pending
NOTES: Unless otherwise stated, the "Reduced Magnitudes" in the plots are Cousins R, based on 2MASS to BVRI conversions (Warner, MPB 34, 113-119)

Two periods found in 2005. The shorter period is about the same but the longer periods differ considerably. Data from 2011 indicate a period of 86 h. The U rating has been reduced to 1 because of the widely divergent solutions.

 

Contents © 2011 Brian D. Warner / Palmer Divide Observatory

 

 

 

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