The VAO consists of an f/6.8 Cassegrain reflector with a 17-in (0.43-m) primary mirror and Dall-Kirkham correction lens. The observatory is located on the roof of Van Allen Hall (41°, 41’ 12” N, 91° 31’ 55” W; elevation 200 m) on the campus of the University of Iowa in Iowa City and the telescope was installed in August 2014 with funding from the Carver Trust. The telescope is mounted on a PlaneWave Instruments L-500 direct-drive Alt-Az mount. The main imaging camera is a SBIG 6303E with a 3K x 2K cooled CCD sensor and a 32’ x 21’ field of view. The available filter set includes Bessel UBVRI photometric filters; L, R, G, and B photographic color filters; and narrowband (5 nm width) H-alpha (656.3 nm), OIII (500.1 nm), and SII (671.6 nm) filters. Alternatively, there is also a ZWO ASI2400MC Pro with a 6K x 4K cooled CMOS sensor and a 42' x 28' field of view, often used for public observing nights.
System Diagram
Equipment Summary
Component | Make, Model | Specifications | Control Software |
|---|---|---|---|
Optical tube assembly | 17-in, 0.43-m, f/6.8 Corrected Dall-Kirkham with dew heaters |
| |
Mount | Direct-drive, Alt-Az | PWI4 | |
Dew heater controller | Controls primary, secondary mirror heaters | PWI3 | |
Focus controller | EFA automates focusing (focuser-rotator), monitors temperature (dew heater controller), and controls fans | PWI3 | |
Focuser-rotator |
| PWI3 | |
Filter wheel | 12-position 50 mm round filters | MaxIm DL | |
Filters | Baader, Astrodon | Detection limit: 16-17 mag; Johnson/Bessel UBVRI; Astrodon LRGB; H-alpha , OIII, SII (Astrodon 5 nm) |
|
Monochromatic Camera (CCD) | 9 micron pixels in 3072 x 2048 array, 32' x 21.5' FOV, plate scale 0.63"/pix | MaxIm DL | |
Color Camera (CMOS) | 5.94 micron pixels in 6072 x 4042 array, 42' x 28' FOV, plate scale 0.42"/pix | SharpCap Pro | |
Dome | Clamshell design | Written by K. Ivarsen |