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The Minor Planet Observer
and
Palmer Divide Observatory

11904 1991 TR1 (2007)

MPC Designation: 1991 TR1
Lightcurves Period (h): 9.123 ± 0.005
Amplitude (mag): 0.31 ± 0.03
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
2007-11-02 07:00  15.73    7.5   48.9   -0.9
2007-11-03 05:00  15.69    6.8   49.0   -1.1
2007-11-04 07:00  15.66    6.0   49.0   -1.3
2007-11-05 07:00  15.62    5.3   49.0   -1.6
2007-11-06 08:00  15.58    4.6   49.1   -1.8
2007-11-07 08:00  15.55    4.0   49.1   -2.1

Data Points: 429
Discovered: 1991-10-13  Palomar  K. J. Lawrence
Family/Group: Hungaria
Taxonomic Class: ES (Assumed)
Published: MPB 35, 67-71
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 was orginally reported as 9.123 h. Given the amplitude and modest phase angle, a bimodal solution is virtually assured, thus the revised period of 18.233 h and a shape that hints of a bifurcated body. The 2012 appartion showed a very low amplitude lightcurve, meaning that the longitude of the pole is close to 50° (or 230°) and the latitude is within 10-15° of the ecliptic plane.

 

Contents © 2012 Brian D. Warner / Palmer Divide Observatory

 

 

 

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