High-accuracy differential image motion monitor measurements for the Thirty Meter Telescope site testing program.
Differential image motion monitors (DIMMs) have become the industry standard for astronomical site characterization. The calibration of DIMMs is generally considered to be routine, but we show that particular care must be paid to this issue if high-accuracy measurements are to be achieved. In a side by side comparison of several DIMMs, we demonstrate that with proper care we can achieve an agreement between the seeing measurements of two DIMMS operating under the same conditions to better than +/-0.02 arc sec.
Wang
Lianqi
L
Department of Physics and Astronomy, University of California, Irvine, Irvine, California 92697, USA. lianqiw@tmt.org
Schöck
Matthias
M
Chanan
Gary
G
Skidmore
Warren
W
Blum
Robert
R
Bustos
Edison
E
Els
Sebastian
S
Riddle
Reed
R
Seguel
Juan
J
Travouillon
Tony
T
Vasquez
Joselino
J
Walker
David
D
Gillett
Paul
P