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“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Tucson in Pima County, Arizona — The American Mountains (Southwest)
 

The McMath Solar Telescope

 
 
The McMath Solar Telescope Marker image. Click for full size.
By Michael Herrick, April 14, 2017
1. The McMath Solar Telescope Marker
Inscription.
This drawing shows the interior of the McMath solar telescope. You are looking at only part of telescope which is above ground. The tunnel for the light beam and the observing rooms where the scientific work is done are buried under the mountain. The picture illustrates the light path of the McMath main beam. At the top of the telescope is a 2 meter flat mirror. It is mounted in heliostat which will track the Sun (or stars), and it directs the light down the polar axis 135 meters to a 1.6 meter image forming, concave mirror. This mirror returns the beam back up the tunnel to a 1.5 meter flat which directs the beam into the observing room below. The beam from the 2 meter mirror, (the main beam), produces an image of the Sun about 84 cm in diameter in the main observing room.

The observing room has a 13.5 meter vertical spectrograph which spreads the sunlight into its component colors, and enables astronomers, from around the world, to study the composition, motions and magnetic fields of our nearest star – the Sun. The spectrograph can be seen in this drawing, going straight down into the mountain below the observing room. The observing room also contains a more compact stellar spectrograph is used for night-time use to study stars that are similar to the sun. There is also a laboratory to the east of the telescope
The McMath Solar Telescope Marker image. Click for full size.
By Michael Herrick, April 14, 2017
2. The McMath Solar Telescope Marker
Two young astronomers study a diagram of the telescope on the marker.
building where the beam may be diverted to do further study of sunlight. In the laboratory, physicists simulate the high temperature solar gas for study.

Focusing of the telescope, and set-up of the light feeds is accomplished by moving the mirrors along railroad tracks in the long tunnel. There are two smaller "auxiliary" telescopes on either side of the main instrument. These can be operated simultaneously. This allows for three different astronomers to work at the same time, with different instruments.

The McMath, named for Robert R. McMath, a Detroit engineer who pursued a life-long interest in the Sun and this observatory on played a major role in the founding of this observatory on Kitt Peak. This the largest solar observatory in the world. It is operated by the National Solar Observatory 24 hours a day for daytime-solar and night time-stellar research programs, carried out by staff and visiting scientists.
 
Location. 31° 57.479′ N, 111° 35.884′ W. Marker is in Tucson, Arizona, in Pima County. Marker is on Arizona Route 386 12 miles south of W. Tucson-Ajo Hwy. (Arizona Route 86), on the left when traveling south. Touch for map. Located at Kitt Peak National Observatory in the Tohono O'odham Nation Reservation. Marker is in this post office area: Sells AZ 85634, United States of America.
 
Other nearby markers.
The McMath Solar Telescope image. Click for full size.
By Michael Herrick, April 14, 2017
3. The McMath Solar Telescope
The heliostat mirrors which track the sun (and stars) are seen at the top of the vertical column. Sunlight is reflected 500 feet down the slanted tube to be reflected twice again to the observation room.
At least 4 other markers are within walking distance of this marker. Kitt Peak National Observatory (about 400 feet away, measured in a direct line); The WIYN Observatory (about 600 feet away); The Vacuum Telescope (approx. 0.2 miles away); Steward Observatory (approx. 0.3 miles away).
 
More about this marker. The marker is located next to the 2.1-meter telescope, about 200 yards from the Solar Telescope.
 
Also see . . .
1. Kitt Peak National Observatory. (Submitted on April 18, 2017, by Michael Herrick of Southbury, Connecticut.)
2. National Solar Observatory. (Submitted on April 18, 2017, by Michael Herrick of Southbury, Connecticut.)
 
Categories. Science & Medicine
 
The McMath Solar Telescope image. Click for full size.
By Michael Herrick, April 14, 2017
4. The McMath Solar Telescope
This mirror reflects light from the bottom of the slanted tube down to the observation room.
The McMath Solar Telescope Observation, Control and Instrument Room image. Click for full size.
By Michael Herrick, April 14, 2017
5. The McMath Solar Telescope Observation, Control and Instrument Room
 
 
Credits. This page was last revised on October 26, 2017. This page originally submitted on April 18, 2017, by Michael Herrick of Southbury, Connecticut. This page has been viewed 94 times since then. Photos:   1, 2, 3, 4, 5. submitted on April 18, 2017, by Michael Herrick of Southbury, Connecticut.
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