Asteroid 5391 Emmons

Asteroid 5391 Emmons is a main belt asteroid with an estimated diameter of 10 km. It was discovered on September 13, 1985 by E. F. Helin at Palomar. The semi-major axis is 2.26 AU, the eccentricity is 0.242 and the inclination is 2.51 degrees.

This asteroid was chosen after a request was made for some images of the asteroid to be made available to the person after whom it was named, Dr Richard Emmons, professor of physics and astronomy at Kent State University. Since a check revealed that no lightcurve had been reported for this asteroid, it was decided to take more than just a few images. Observations were made on four nights during the period from September 3 to September 15, 2002, using either 90 or 180 second exposures. A total of 419 observations were used in the solution. This asteroid was observed on four nights during June 2004. Analysis of the data indicated that the asteroid has a very asymmetric lightcurve, with the second peak being only about half the amplitude of the first peak. The derived period was 3.028 hours.

Lightcurve results for 5391 Emmons.
Derived period 3.028 +/- 0.004 hours. Amplitude 0.14 +/- 0.02 magnitude.