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Roger Jennison developed this novel technique for obtaining information about visibility phases in an interferometer when delay errors are present. Although his initial laboratory measurements of closure phase had been done at optical wavelengths, he foresaw greater potential for his technique in radio interferometry. In 1958 he demonstrated ...
Aperture masking interferometry (or Sparse aperture masking) is a form of speckle interferometry, that allows diffraction limited imaging from ground-based telescopes (like the Keck Telescope and the Very Large Telescope), and is a high contrast imaging mode on the James Webb Space Telescope. This technique allows ground-based telescopes to ...
The greater telescope separations are possible in VLBI due to the development of the closure phase imaging technique by Roger Jennison in the 1950s, allowing VLBI to produce images with superior resolution. [2] VLBI is best known for imaging distant cosmic radio sources, spacecraft tracking, and for applications in astrometry.
The observatory dome underwent a renovation that included repainting in 1996. [4] In 2009, Professors Leslie Looney and Benjamin McCall constructed a spectrometer on the ground floor of the observatory, and ran an optical fiber cable to the telescope in the dome. They used this to teach an astrochemistry class until the 50-fiber bundle was broken.
The observatory is a 1-meter Coudé telescope with a field of view of 0.7 degrees, supported by an English cross-axial mount inside a dome 12.5-meters in diameter. Its main purposes are: to be the optical ground station of the Artemis telecommunications satellite (the project from which the telescope takes its name)
A dedicated workshop holds all the eyepieces, cameras, adapters, and various support equipment needed to maintain the telescopes. The primary 30.5 feet (9.3 m) dome weighs 18,000 pounds (8,200 kg) [3] and is elevated above the classroom. A smaller 7 feet (2.1 m) diameter dome housing a heliostat sits atop the classroom roof.
When not observing an event, the telescopes are used remotely by public school students in North Carolina. Construction of six fully automated domes started in 2004 and the telescopes began operating in 2006. [26] The status of a sixth telescope, originally planned to observe at near-infrared wavelengths, is unclear. The building for a seventh ...
It is located on the roof of the Earth and Space Sciences Building. The dome contains a Meade 14" Maksutov–Cassegrain telescope and SBIG (SBIG-STL1001e) imaging equipment. The telescope is used for teaching undergraduate and graduate astronomy labs by the department, as well as by the Astronomy club.
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