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LONEOS Schmidt Telescope

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The LONEOS Schmidt Telescope achieved first light in January 1998 and its use has been dedicated solely to a NASA-funded search for near-Earth objects ever since. Observations are made on every clear night.

Originally built for Ohio Wesleyan University in 1939 by J.W. Fecker Company of Pittsburg, Lowell Observatory first leased and then purchased the telescope from the University. With a 25-inch primary mirror, the LONEOS Schmidt telescope was completely refurbished by the Lowell Observatory instrument team led by Ralph Nye. Now fully automated, it includes a new corrector lens, an internally mounted CCD camera, a new drive system, invar rods for focus stability, a new mount assembly, and many other custom-designed and refitted parts. As part of a NASA-funded search for near-Earth asteroids, the Lowell Observatory Near-Earth-Object Search (LONEOS) continues to be very productive. Visit LONEOS for more information.



Lowell Telescope Specification chart

Perkins 72" Hall 42" LONEOS 31" 21"
Longitude 111° 32' 09.3" 111° 32' 07.9" 111° 32.2' 111° 32' 09.0" 111° 39' 59.2"
Latitude +35° 05' 48.6" +35° 05' 48.3" +35° 05.8' +35° 05' 54.6" +35° 12' 10.4"
Altitude 7236ft. (2206m) 7236ft. (2206m) 7236ft. (2206m) 7243ft. (2208m) 7260ft. (2213m)
Dp 72" (1.8m) 41" (1.04m) * 31/29.5" (0.79/0.75m) 20.78 (0.53m)
F/# 17.5 8.06 * 15 15.9
EFI 1256.5" (31.93m) 330.39" (8.392m) * 464" (11.78m) 332.5" (8.44m)
Scale ("/mm) 6.45 24.58 * 17.5 24.3
BFI 51.5" (1.30m) 29.9" (0.759m) * 25" (0.63m) 20" (0.51m)
Fp/# 4.18 4.05 * 5.0 3.4
FLp 300.6" (7.635m) 166.06" (4.218m) * 155" (3.94m) 70.0" (1.77m)
Dsa 16.3" (0.41m) 16.6" (0.422m) * 9.0" (0.22m) 4.6" (0.12m)
Is 284.1" (7.22m) 130.43" (3.313m) * 134.9" (3.43m) 72.7" (1.85m)
Os 68.0" (1.72m) 65.51" (1.664m) * 45.1" (1.14m) 15.3" (0.39m)
Ms 232.6" (5.91m) 100.56" (2.554m) * 109.9" (2.79m) 54.7" (1.39m)
mag 4.2 1.990 * 3.0 4.7
K1 -1.0 -1.306 * -1.00 -1.00
K2 -3.65 -14.945 * -5.01 -3.35

1) Longitude and latitude are good to about 0.2.
2) The altitudes are good to about 1 meter.
4) The Hall F/8 is a Ritchey-Chretien telescope.
5) The 31inch primary if F/5. However, it is stopped down to 29.5 inches.
6) Only the Hall F/8 has a known optimum back focal distance.
7) The conic constant is defined such that 0 is a circle and -1 is a parabola.
8) Dsa is the diameter of the axial cone at the secondary. The diameter of the secondary is 1 to 2 inches larger than Dsa.

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