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The Minor Planet Observer
and
Palmer Divide Observatory

2131 Mayall (2009)

MPC Designation: 1975 RA
Lightcurves Period (h): 2.5678 0.0001
Amplitude (mag): 0.09 0.01
Equipment:

 

Filter: C
MagBand: R
Telescope: 0.35m f/9.1 SCT
Camera: FLI 1001E
Exposure: 180

 

Obs. Details

Date              E Mag   Phase  PABL   PABB
2009-11-30 07:00  15.48   25.1   91.4   35.0
2009-12-01 07:00  15.46   24.8   91.4   34.9
2009-12-10 07:00  15.34   22.4   91.7   33.4
2009-12-11 07:00  15.32   22.1   91.7   33.3
2009-12-13 07:00  15.30   21.6   91.8   32.9
2009-12-14 07:00  15.29   21.4   91.8   32.7

Data Points: 630
Discovered: 1975-09-03  Mount Hamilton  A. R. Klemola
Family/Group: Hungaria
Taxonomic Class: S
Published: MPB 37, 70-73
CBET 2105
NOTES: Unless otherwise stated, the "Reduced Magnitudes" in the plots are Cousins R, based on 2MASS to BVRI conversions (Warner, MPB 34, 113-119)

PDO binary discovery in collaboration with Petr Pravec and the Binary Asteroid Survey Group. This was the third apparition at which the asteroid was observed but only the first time that obvious evidence for a satellite was seen. The "bowing" in the orbital lightcurve is the result of the rotation of the slightly elongated satellite, which is tidally locked to the orbital period.

Estimated size ratio (satellite/primary): Ds/Dp >= 0.26.

 

Contents 2011 Brian D. Warner / Palmer Divide Observatory

 

 

 

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