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5639 1989 PE (2009)
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MPC Designation: |
1989 PE |
| Lightcurves |
Period (h): |
23.30 ± 0.02 |
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Amplitude (mag): |
0.15 ± 0.02 |
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Equipment: |
Filter: C
MagBand: R
Telescope: 0.35m f/9.1 SCT
Camera: SBIG STL-1001E
Exposure: 240 |
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Obs. Details |
Date E Mag Phase PABL PABB
2009-07-17 07:00 16.71 17.9 311.9 18.0
2009-07-18 07:00 16.69 17.4 312.0 17.8
2009-07-19 07:00 16.66 16.9 312.0 17.6
2009-07-23 07:00 16.56 14.9 312.1 16.7
2009-07-24 07:00 16.53 14.5 312.1 16.5
2009-07-27 07:00 16.46 13.1 312.2 15.8
2009-08-02 07:00 16.35 10.8 312.2 14.3
2009-08-03 07:00 16.33 10.5 312.2 14.0
2009-08-04 07:00 16.32 10.3 312.2 13.7
2009-08-05 07:00 16.31 10.1 312.2 13.5
2009-08-08 07:00 16.30 9.8 312.1 12.6
2009-08-09 07:00 16.31 9.8 312.1 12.3
2009-08-10 07:00 16.31 9.9 312.1 12.1
2009-08-11 07:00 16.32 10.0 312.1 11.8
2009-08-12 07:00 16.33 10.2 312.1 11.5
2009-08-13 07:00 16.34 10.4 312.2 11.2
2009-08-15 07:00 16.38 11.0 312.2 10.6
2009-08-16 07:00 16.39 11.3 312.2 10.3
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Data Points: |
384 |
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Discovered: |
1989-08-09 Palomar J. Alu, E. F. Helin |
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Family/Group: |
Hungaria |
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Taxonomic Class: |
ES (Assumed) |
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Published: |
MPB 38, pending
37, 24-27 |
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NOTES: |
Unless otherwise stated, the "Reduced Magnitudes" in the plots are
Cousins R, based on 2MASS to BVRI conversions (Warner, MPB 34, 113-119)This is a revision to earlier results (45.4 h). Re-examination of the data indicates the period near 23.3 h. This is still contradictory to results using 2011 data, which give a period of 6.2 or 3.1 h. The significant disparity and the fact that the data set from one year cannot be fit to the results from the other are the reason for the U = 1 rating. |
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Contents © 2011 Brian D. Warner / Palmer Divide Observatory |
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