Faint Object Camera
Installed on HST from 1990 to 2002
The Faint Object Camera (FOC) was a camera installed on the Hubble Space Telescope from launch in 1990 until 2002. It was replaced by the Advanced Camera for Surveys. In December 1993, Hubble's vision was corrected on STS-61 by installing COSTAR, which corrected the problem with Hubble's mirror before it reached an instrument like FOC. Later instruments had this correction built in, which is why it was possible to later remove COSTAR itself and replace it with a new science instrument.
The camera was built by Dornier GmbH and was funded by the European Space Agency. The unit actually consists of two complete and independent camera systems designed to provide extremely high resolution, exceeding 0.05 arcseconds. It is designed to view very faint UV and optical light from 115 to 650 nanometers in wavelength. FOC has been compared to a "telephoto" lens, providing a high resolution in a small field of view. FOC could distinguish between two points 0.05 arc-seconds apart.
Rather than CCDs the FOC used photon-counting digicons as its detector.
The camera was designed to operate at low, medium, or high resolution. The angular resolution and field of view at each resolution were as follows:
| Angular resolution | Field of view | |
|---|---|---|
| Low resolution (f/48) | 0.043 arcseconds | 22 arcseconds |
| Medium resolution (f/96) | 0.022 arcseconds | 11 arcseconds |
| High resolution (f/288) | 0.0072 arcseconds | 3.6 arcseconds |
Sources and credits
This article is adapted from the Wikipedia article “Faint Object Camera”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.
Images, from Wikimedia Commons:
- Faint Object Camera (Dornier Museum).jpg by Stefan-Xp, CC BY-SA 3.0
- Surface Map of Pluto.jpg by Alan Stern (Southwest Research Institute)/Marc Buie (Lowell Observatory)/NASA/ESA, Public domain
- Pluto and Charon from Hubble.jpg by Dr. R. Albrecht, ESA/ESO Space Telescope European Coordinating Facility; NASA, Public domain
- Einstein cross.jpg by NASA, ESA, and STScI, Public domain
- Nova cygni 1992.jpg by NASA, Public domain
- Liftoff STS-31.jpg by NASA, Public domain
- ACS FOC swap.jpg by NASA Original uploader was Modest Genius at en.wikipedia, Public domain
- Columbia making its final landing after STS-109 mission.jpg by NASA, Public domain
Fathomly is not affiliated with or endorsed by the Wikimedia Foundation. Spotted a problem? Tell us.