What is the size of the primary mirror of the Hale Telescope?
What is the size of the primary mirror of the Hale Telescope?
200-inch
The Hale’s primary mirror is a 200-inch (5.1-meter) in diameter Pyrex disk that weighs 14.5 tons (13 tonnes). Its polished surface, covered with a thin layer of aluminum, is concave. The mirror’s thickness varies between 19 ⅝ inches (49.8 cm) at the center and 23 ½ inches (59.7 cm) at the outer edge.
Why is it called the 200-inch telescope?
The 200-inch telescope is named after astronomer and telescope builder George Ellery Hale. It was built by Caltech with a $6 million grant from the Rockefeller Foundation, using a Pyrex blank manufactured by Corning Glass Works under the direction of George McCauley.
What is the diameter of the objective lens of the Hale Telescope?
The objective lens is 102 cm (40 inches) in diameter, and the telescope tube is about 19 m long. Example 25-8. Reflecting telescopes For an astronomical telescope to produce bright images of distant stars. the objective lens must be large to allow in as much light as possible.
What tolerance is the primary mirror on the Hale Telescope polished to?
The huge telescope George Hale proposed would have at its heart a 200-inch diameter mirror, ground and polished to a paraboloid figure within a tolerance of millionths of an inch.
How long did it take to build the Hale Telescope?
Over 13 years almost 10,000 lb (4.5 t) of glass was ground and polished away reducing the weight of the mirror to 14.5 short tons (13.2 t).
Who owns Palomar Observatory?
the California Institute of Technology
Palomar Observatory is a privately owned observatory located in San Diego County, California, 90 miles southeast of Mount Wilson Observatory, on Palomar Mountain. It is owned and operated by the California Institute of Technology.
Where is the world’s most powerful telescope located?
Extremely Large Telescope
| An artist’s impression of the ELT | |
|---|---|
| Alternative names | ELT |
| Part of | European Southern Observatory |
| Location(s) | Cerro Armazones, Antofagasta Province, Antofagasta Region, Chile |
| Coordinates | 24°35′21″S 70°11′30″WCoordinates: 24°35′21″S 70°11′30″W |
Why are most telescopes reflectors not refractors?
Why are most large telescopes reflectors, not refractors? A. Reflectors do not suffer from chromatic aberration like refractors do. Which design has a convex primary mirror and flat secondary mirror, with the eyepiece located on the top side of the telescope tube?
How long did it take to build the Hale telescope?
Who built the Hale Telescope?
Astronomer George Ellery Hale
Astronomer George Ellery Hale built the world’s largest telescope four times over, each new instrument trumping the last. Palomar was his crowning achievement.
Why is Palomar Observatory closed?
Due to the continuing pandemic, Palomar Observatory remains closed to the public. Visit the Tours and Greenway Talks headings in this section of our website for information about our online programs. Palomar Observatory is owned and operated by Caltech, and as such it is private property.
