![]() ![]() Its observation range gives the telescope access to 85 percent of the observable universe. The NRQZ is centered between the Green Bank Observatory in Green Bank, West Virginia, and Sugar Grove Station in Sugar Grove, West Virginia. In this paper we provide a summary of the GBT’s pointing model and associated corrections, as well as a discussion of relevant metrology systems and an analysis of its current nighttime pointing accuracy. Byrd Green Bank Telescope the largest fully steerable telescope in the world, at 485 feet, it is also 60 percent taller than the Statue of Liberty and almost as tall as the National Monument. It straddles the borders of Virginia and West Virginia, and also includes a small part of Maryland. The model utilizes standard geometrical corrections along with metrology data from the GBT’s structural temperature sensors and data from measurements of the track levels. ![]() A pointing model was developed for the GBT to correct for these effects. However, factors such as gravitational flexure, thermal deformation, azimuth track tilt and irregularity, and small misalignments and offset errors within the telescope’s structure cause pointing inaccuracies. The GBT’s off-axis design is advantageous in that it eliminates blockage of the dish and reduces sidelobe interference, and there is no evidence that the resulting asymmetric structure adversely affects pointing accuracy. The required pointing accuracy is dependent upon the half-power beamwidth, and for the higher-frequency end of GBT observing, this means that pointing must be accurate to within a few arcseconds RMS. Accurate pointing requires the ability to blindly acquire source locations and perform ad hoc corrections determined by observing nearby calibrator sources in order to obtain a starting position accurate to within a small margin of error of the target’s location. Byrd Green Bank Telescope (GBT) is the most technically advanced single-dish radio telescope in the world. In Charles Town, West Virginia, a bright white dome sits gracefully atop the Information Technology building on the American Public University System (APUS) campus. We are the premiere supplier of astronomy related products in the mid-atlantic region. A major challenge facing large ground-based radio telescopes is achieving sufficient pointing accuracy for observing at high frequencies, up to 116 GHz in the case of the GBT. 510 Courtesy West Virginia Department of Tourism Dedicated in 2000, the Robert C. Insight Astronomy, LLC, Bridgeport, West Virginia. With a 100 m × 110 m off-axis paraboloid dish, the Green Bank Telescope (GBT) is the largest fully steerable radio telescope on Earth. Any opinions, findings and conclusions or recommendations expressed in this material do not necessarily reflect the views of the National Science Foundation. West Virginia University, Morgantown, WV, USA Green Bank Observatory is supported by the National Science Foundation and is operated by Associated Universities, Inc. Ray 2Į-mail: Bank Observatory, Green Bank, WV, USA Astronomical objects: linking to databasesĮ. ![]() Including author names using non-Roman alphabets.Suggested resources for more tips on language editing in the sciences Punctuation and style concerns regarding equations, figures, tables, and footnotes ![]()
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