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Telescopes at Millikin
Parallax Instruments 20" Ritchey-Chrétien
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Model No.
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PI500R, 20"
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Clear Aperture
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508mm
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Focal Ratio
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F/8.1
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Focal Length
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4114mm
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Primary & Secondary Mirror Substrate
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Zero Expansion Astrositall
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Telescope Tube
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Low Expansion Carbon Fiber
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Secondary Amplification
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2.70X
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Spacing (Approx.)
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40"
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Mirror Coatings
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AlSiO
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Optical Tube Dia.
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24"
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Optical Tube Length
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56"
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Optical Tube Weight
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130lbs.
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Focuser
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2.7"
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Finder Scope
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7X50
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Tube Rings
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Standard
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Primary Cooling Fan
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Standard (Quantity 3)
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Slewing Handle
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Standard
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Tube C'wt Bar Assy.
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Standard (Quantity 2)
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Meade LX 200 8" Schmidt-Cassegrain
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f
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6.3
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10
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Focal Length
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1280mm
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2000mm
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Aperture
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203mm
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203mm
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Secondary
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88mm
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76mm
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Obstruction
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43%
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37%
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Type
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SCT
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SCT
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Drive
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Fully computer controlled; 64359 object library; automatic GO TO capability
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Altaz
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Yes
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Polar
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Yes with optional wedge
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Eyepiece
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26mm Plossl
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Finder
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8x50
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RS232
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Yes
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Power
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18v DC (AC adapter included)
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Cameras at Millikin
ST-7XME
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CCD
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Kodak KAF-0402ME + TI TC-237
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Pixel Array
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765 x 510 pixels, 6.9 x 4.6 mm
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Total Pixels
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390,000
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Pixel Size
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9 x 9 microns
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Full Well Capactiy (ABG)
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~50,000 e-
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Full Well Capactiy (NABG)
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~100,000 e-
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Dark Current
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1e-/pixel/sec at 0C
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Antiblooming
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KAF-0402ME is NABG only ABG optional (KAF-0402LE)
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Shutter
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Electromechanical
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Exposure
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0.11 to 36000 seconds, 10ms resolution
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Correlated Double Sampling
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Yes
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A/D Converter
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16 bits
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A/D Gain
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2.6e-/ADU
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Read Noise
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15e-RMS
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Binning Modes
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1 x 1, 2 x 2, 3 x 3
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Pixel Digitization Rate
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Up to 420,000 pixels per second
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Full Frame Acquisition
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~35 seconds
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Field of View
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12 x 8 arcminutes on f/10 Meade LX 200
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Pixel Size
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.9 x .9 arcseconds on f/10 Meade LX 200
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Limiting Magnitude
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Magnitude 14 in 1 second
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(for 3 arcsec FWHM stars)
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Magnitude 18 in 1 minute
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Cooling - standard
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Single Stage Thermoelectric, Active Fan, Water Assist Ready -45 C from Ambient Typical
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Temperature Regulation
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+-0.1 C
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Power
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5 VDC at 1.5 amps, +-12 VDC at 0.5 amp desktop power supply included
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Computer Interface
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Parallel
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Computer Compatibility
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Windows 98/2000/Me/NT/XP
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Guiding
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Dual CCD Self-Guiding
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STL-1001E
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Imaging CCD
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Kodak Enhanced KAF-1001E
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Pixel Array
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1024 x 1024 pixels, 24.6 x 24.6 mm
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Total Pixels
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1.0 million
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Pixel Size
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24 x 24 microns
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Full Well Capacity (NAGB)
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200,000 e-
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Dark Curent
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9 e-/pixel/second at 0 degrees C
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Antiblooming
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NAGB only
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Shutter
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Electromechanical
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Exposure
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0.12 to 3600 seconds, 10 ms resolution
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Correlated Double Sampling
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Yes
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A/D Converter
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16 bits
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A/D Gain
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2.0e-/ADU
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Read Noise
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14.8e-RMS
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Binning Modes
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1 x 1, 2 x 2, 3 x 3
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Full Frame Download
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40.8 seconds
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Cooling - standard
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Two-Stage Thermoelectric, Water Assist, -40 C from Ambient Typical
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Temperature Regulation
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+-0.1 degrees C
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Power
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10-18VDC, 12VDC nominal, Universal AC to 12VDC desktop supply
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Computer Interface
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Parallel
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Computer Compatibility
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WIndows 98/NT/2000/Me/XP/Mac OS-X
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Guiding
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Dual CCD Self-Guiding Standard,
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SGS-Self Guided Spectrograph
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Dispersion:
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Two gratings available, on a carousel for rapid selction
150 lines per mm (4.3 Angstroms per pixel)
600 lines per mm (1.0 Angstroms per pixel)
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Slit Width
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100 microns wide Entrance Slit
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Accptance cone angle:
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F/6.3 by F/10
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Resolution:
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Narrow slit & 600 lines/mm
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2.4 Angstroms
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Narrow slit & 150 lines/mm
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10 Angstroms
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Wide slit & 600 lines/mm
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10 Angstroms
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Wide slit & 150 lines/mm
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38 Angstroms
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Relative Sensitivity to Diffuse Sources:
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Narrow slit & 600 lines/mm
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1.0
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Narrow slit & 150 lines/mm
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4.0
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Wide slit & 600 lines/mm
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4.0
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Wide slit & 150/mm
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16.0
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Dispersion:
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1.07 or 4.3 Angstroms per pixel
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Resolution
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Emission line is recorded with 2.4, 10 or 38 Angstroms Full Width at Half Maximum
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Spectral coverage per frame
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About 750 Angstroms with the high resolution grating, or 32000 with the low resolution grating
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Center Wavelength Selection
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Calibrated Micrometer Adjustment
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Wavelenght Range
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3800 to 7500 Angstroms
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Sensitivity
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Signal to noise ration of 10:1 for a 9th mag star, 20 minute exposure using a non-AGB ST-7 and a 10 inch (25 cm) apertaur in high resolution mode. An ABG ST-7 will reach magnitude 8. The low resolution mode will be 1.5 magnitudes more sensitive.
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Entrance Slit
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18 micron (2.3 arcseconds wide with 63 inch focal length telescope or 72 microns
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Uses:
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Stellar Classification
Analysis of Nebular Lines
Indentification of spectroscopic binaries
Measurement of Stellar proper motion to +/- 6km/sec accuracy
Measurement of Emission Nebula Proper Motions
Spectra of Laboratory and field sources
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