Arecibo Observatory Loses Funding

An anonymous reader noted that "The Arecibo Observatory funding was slashed. Cut to $8 million from $10.5 million, which will decrease the amount of time that the telescope is operational. "A quarter of its staff was laid off last year," and Arecibo, which is located in Puerto Rico, could possibly be completely closed in four years, according to the "National Science Foundation (NSF), which pays for the operation of the telescope." This comes after "a review panel for the foundation's astronomy division two years ago" suggested cutting Arecibo's financing by 25 percent as a way to pay for new facilities. There has been "[a]n outcry" in response to the "decision, particularly from planetary scientists" who argued that the panel "overlooked Arecibo's role in cataloging potential dangers from asteroids." The Times notes that in Arecibo's favor is the fact that it "may be much cheaper to keep...open" than dismantle, which "could cost hundreds of millions of dollars."" I've been considering a vacation to PR for a few years, and seeing this thing is on my list of awesome things to try to see. Guess I should hurry ;)

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Arecibo Observatory General Information

[Kildjean]

I got this from wikipedia, http://en.wikipedia.org/wiki/Arecibo_Observatory , but thought it would be useful for people that don't know much about it.

General Information

The Arecibo telescope is distinguished by its enormous size: the main collecting dish is 305 m in diameter, constructed inside the depression left by a karst sinkhole. The dish is the largest curved focusing dish on Earth, giving Arecibo the largest electromagnetic-wave gathering capacity. The Arecibo telescope's dish surface is made of 38,778 perforated aluminum panels, each measuring about 1 m by 2 m (3 ft by 6 ft), supported by a mesh of steel cables.

It is a spherical reflector (as opposed to a parabolic reflector). This form is due to the method used to aim the telescope: the telescope's dish is fixed in place, but the receiver at its focal point is repositioned to intercept signals reflected from different directions by the spherical dish surface. The receiver is located on a 900-ton platform which is suspended 150 m (450 ft) in the air above the dish by 18 cables running from three reinforced concrete towers, one of which is 110 m (365 ft) high and the other two of which are 80 m (265 ft) high (the tops of the three towers are at the same elevation). The platform has a 93 m long rotating bow-shaped track called the azimuth arm on which receiving antennae, secondary and tertiary reflectors are mounted. This allows the telescope to observe any region of the sky within a forty degree cone of visibility about the local zenith (between -1 and 38 degrees of declination). Puerto Rico's location near the equator allows Arecibo to view all of the planets in the solar system, though the round trip light time to objects beyond Saturn is longer than the time the telescope can track it, preventing radar observations of more distant objects.

The construction of the Arecibo telescope was initiated by Professor William E. Gordon of Cornell University, who originally intended to use it for the study of Earth's ionosphere. Originally, a fixed parabolic reflector was envisioned, pointing in a fixed direction with a 150 m (500 ft) tower to hold equipment at the focus. This design would have had a very limited use for other potential areas of research, such as planetary science and radio astronomy, which require the ability to point at different positions in the sky and to track those positions for an extended period as Earth rotates. Ward Low of the Advanced Research Projects Agency (ARPA) pointed out this flaw, and put Gordon in touch with the Air Force Cambridge Research Laboratory (AFCRL) in Boston, Massachusetts where a group headed by Phil Blacksmith was working on spherical reflectors and another group was studying the propagation of radio waves in and through the upper atmosphere. Cornell University proposed the project to ARPA in the summer of 1958 and a contract was signed between the AFCRL and the University in November of 1959. Cornell University published a request for proposals (RFP) asking for a design to support a feed moving along a spherical surface 435 feet (133 m) above the stationary reflector. The RFP suggested a tripod or a tower in the center to support the feed. George Doundoulakis, director of research for the antenna design company General Bronze Corp in Garden City, N.Y. received the RFP from Cornell and studied it with his brother, Helias Doundoulakis, a civil engineer.

The two brothers thought of a more efficient way to suspend the feed, and finally designed the cable suspension system that was used in final construction. U.S. Patent office granted Helias Doundoulakis patent No. 3,273,156 on Sept. 13, 1966 with the title "Radio Telescope having a scanning feed supported by a cable suspension over a stationary reflector".

Construction began in the summer of 1960, with the official opening taking place on November 1, 1963. As the primary dish is spherical, its focus is along a line rather than at a single point (as would be the case for