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The Minor Planet Observer
and
Palmer Divide Observatory

1685 Toro (2012)

MPC Designation: 1948 OA
Lightcurves Period (h): 10.226 10.188
Amplitude (mag): 1.38 0.02
Equipment:

 

Filter: C
MagBand: V
Telescope: 0.30m f/6.25 SC
Camera: ST-9XE
Exposure: 90

 

Obs. Details

Date              E Mag   Phase  PABL   PABB
2012-07-24 07:50  14.36   73.8  353.1   18.1
2012-07-24 09:30  14.36   73.9  353.2   18.2
2012-07-26 07:20  14.39   76.3  356.2   19.1
2012-07-26 08:40  14.40   76.4  356.3   19.1
2012-08-13 07:00  15.14   95.4   25.9   23.8
2012-08-13 09:00  15.14   95.4   26.0   23.8
2012-08-17 07:00  15.32   97.7   32.4   23.7
2012-08-17 07:00  15.32   97.7   32.4   23.7
2012-08-19 07:00  15.40   98.5   35.6   23.5

Data Points: 334
Discovered: 1948-07-17  Mount Hamilton  C. A. Wirtanen
Family/Group: NEA
Taxonomic Class: S
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)

The period is for the data from July. The August data give a period of 10.188 h with an amplitude of 1.80 mag. These show the dramatic difference that can occur for a NEA lightcurve during an apparition and why a combined data set giving a single period would not tell the whole story.

 

Contents 2012 Brian D. Warner / Palmer Divide Observatory

 

 

 

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