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The Minor Planet Observer
and
Palmer Divide Observatory

8026 1991 JA1 (2010)

MPC Designation: 1991 JA1
Lightcurves Period (h): 372. 5.
Amplitude (mag): 0.90 0.03
Equipment:

 

Filter: C
MagBand: R
Telescope: 0.5m f/8.1 R/C
Camera: FLI 1001E
Exposure: 240

 

Obs. Details

Date              E Mag   Phase  PABL   PABB
2010-07-11 07:00  17.01   20.5  294.5   29.3
2010-07-13 07:00  17.00   20.5  294.7   29.5
2010-07-16 07:00  16.99   20.5  294.9   29.7
2010-07-17 07:00  16.99   20.6  295.0   29.7
2010-07-19 07:00  16.99   20.6  295.2   29.8
2010-07-20 07:00  16.99   20.7  295.3   29.9
2010-08-11 07:00  17.15   24.0  297.6   29.7
2010-08-13 07:00  17.17   24.4  297.9   29.6
2010-08-14 07:00  17.18   24.6  298.1   29.5
2010-08-15 07:00  17.20   24.9  298.2   29.4
2010-08-18 07:00  17.24   25.5  298.7   29.2
2010-08-30 07:00  17.41   28.0  301.2   28.1

Data Points: 306
Discovered: 1991-05-08  Palomar  E. F. Helin
Family/Group: Hungaria
Taxonomic Class: ES (Assumed)
Published: MPB 38, 33-36
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 the second discovery of a possible rare binary type (the other being 218144) where there is a short-period, low-amplitude component superimposed on a long-period, large amplitude component. Which object would be the primary and which would be the secondary is a matter for debate.

 

Contents 2011 Brian D. Warner / Palmer Divide Observatory

 

 

 

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