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The Minor Planet Observer
and
Palmer Divide Observatory

5646 1990 TR (2012)

MPC Designation: 1990 TR
Lightcurves Period (h): 3.1999 0.0002
Amplitude (mag): 0.12 0.01
Equipment:

 

Filter: C
MagBand: V
Telescope: 0.30m f/9.6 SCT
Camera: ST-9XE
Exposure: 240

 

Obs. Details

Date              E Mag   Phase  PABL   PABB
2012-11-22 07:00  15.36   10.5   61.2   11.0
2012-11-24 07:00  15.42   10.4   61.5   11.1
2012-11-25 07:00  15.46   10.5   61.6   11.1
2012-12-04 07:00  15.84   12.9   63.0   11.3
2012-12-07 07:00  15.99   14.2   63.5   11.3
2012-12-10 07:00  16.14   15.4   64.1   11.3
2012-12-12 07:00  16.24   16.3   64.5   11.3
2012-12-13 07:00  16.29   16.7   64.7   11.3
2012-12-14 07:00  16.34   17.1   64.8   11.3
2012-12-17 07:00  16.50   18.4   65.5   11.3
2012-12-18 07:00  16.54   18.8   65.7   11.2

Data Points: 551
Discovered: 1990-10-11  Kushiro  S. Ueda, H. Kaneda
Family/Group: NEA
Taxonomic Class: S (Assumed)
Published: MPB 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)

_Probable_ new binary discovery. The orbital period, P_orb = 19.47 h, is almost an exact 6:1 ratio of the short period, meaning the secondary period may be the result of the Fourier analysis latching onto noise. The same results were found using orders of 2,3,4,5,6,7, which somewhat favors the result being real and not a processing artifact.

 

Contents 2013 Brian D. Warner / Palmer Divide Observatory

 

 

 

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