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The Minor Planet Observer
and
Palmer Divide Observatory

8369 1991 GR (2011)

MPC Designation: 1991 GR
Lightcurves Period (h): 2.7368 ± 0.0005
Amplitude (mag): 0.24 ± 0.02
Equipment:

 

Filter: C
MagBand: R
Telescope: 0.35m f/9.1 SCT
Camera: SBIG STL-1001E
Exposure: 240

 

Obs. Details

Date              E Mag   Phase  PABL   PABB
2011-03-14 07:00  15.61    5.2  166.6   10.4
2011-03-15 07:00  15.62    5.4  166.6   10.4
2011-03-24 07:00  15.79    8.0  166.4    9.8
2011-03-26 07:00  15.83    8.7  166.4    9.6

Data Points: 314
Discovered: 1991-04-08  Palomar  E. F. Helin
Family/Group: Eunomia
Taxonomic Class: S (Assumed)
Published: MPB 38, 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)

Started as a target of opportunity. Collaboration with Dan Coley (Center for Solar System Studies). There is a weak indication of a secondary period (~21.3 h). A plot of it is included here. It does not closely resemble the lightcurve that one would expect due to a satellite. Future observations are strongly encouraged.

 

Contents © 2011 Brian D. Warner / Palmer Divide Observatory

 

 

 

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