For Astronomers
Sky Conditions
CCD specifications
- Camera: Apogee Alta U47
- Array Size: 1024 × 1024 pixels
- Pixel Size: 13 × 13 μm
- Read Noise: 9 e-
- Cooling: Thermoelectric system with forced air
- Dark Current: ≈ 0.1–0.2 e-/pix/s; depends on CCD temperature
Telescope Specifications
- Coordinates: 42° 42’ 23” North, 05h 37m 56s West
- Elevation site/telescope: 866 ft/896 ft above sea level
- Telescope Manufacturer: Boller and Chivens Division, Perkin-Elmer Corporation
- Guide telescope:
- Aperture: 6 in
- Focal Ratio: f/15
- Focal length: 90 in
- Faintest Visible Magnitude: 12.7
12 mm eyepiece 24 mm eyepiece Magnification 190× 95× Field of view 13’ 26’ - Primary Mirror
- Aperture: 24 in (clear aperture)
- Focal Ratio: f/3.0 paraboloid
- Optical Material: Cer-Vit
- Focal length: 72 in
- Faintest Visible Magnitude: 15.7
- Seconday Mirror: f/8.0 Cassegrain
- Effective focal length: 192 in
- Field diameter: 60.0’
- Approx. magn. with Erfle eyepiece: 175×
- Approx. FOV with Erfle eyepiece: 28’
- Field Flattener: Yes
- 2nd Mirror Aperture: 9.14 in
- 2nd Mirror Focal Length: -39.91 in
- Plate scale: 42.3”/mm
- Focusing: Electronic drive at secondary mirror
- Optical quality: 80% of the light from an on-axis pt. source images within a circle .5” dia. at any of three foci
- Mirror coating: Aluminized with a magnesium fluoride overcoat
- Optical configurations: f/8 Cassegrain
- Type of Mount: Equatorial off-axis
- Telescope weight: 6000 pounds
- Slew drive rate: 4° per second
- Guide and set drive rate: Servo controlled variable
- Tracking drive gear: diameter 3 in, 360 teeth
- Tracking accuracy: 2” per 5 min; 5” per hr
- Position setting accuracy: RA: .01m; Dec: .1’
- Other secondary mirrors:
f/13.5 Cassegrain f/34.6 Coude Effective focal length 324 in 830 in Field diameter 31.8’ 24.9’ Approx. magn. with Erfle eyepiece 295× Approx. FOV with Erfle eyepiece 17’ Field Flattener No No 2nd Mirror Aperture 6.07 in 8.50 in 2nd Mirror Focal Length -21.39 in 27.32 in Plate scale 25.1”/mm 09.8”/mm
