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Millikin University - Decatur, IL
Telescopes and Equipment 





 

































 







Telescopes at Millikin


Parallax Instruments 20" Ritchey-Chrétien

Model No.

PI500R, 20"

Clear Aperture

508mm

Focal Ratio

F/8.1

Focal Length

4114mm

Primary & Secondary Mirror Substrate

Zero Expansion Astrositall

Telescope Tube

Low Expansion Carbon Fiber

Secondary Amplification

2.70X

Spacing (Approx.)

40"

Mirror Coatings

AlSiO

Optical Tube Dia.

24"

Optical Tube Length

56"

Optical Tube Weight

130lbs.

Focuser

2.7"

Finder Scope

7X50

Tube Rings

Standard

Primary Cooling Fan

Standard (Quantity 3)

Slewing Handle

Standard

Tube C'wt Bar Assy.

Standard (Quantity 2)

 

Meade LX 200 8" Schmidt-Cassegrain

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f

6.3

10

Focal Length

1280mm

2000mm

Aperture

203mm

203mm

Secondary

88mm

76mm

Obstruction

43%

37%

Type

SCT

SCT

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Drive

Fully computer controlled; 64359 object library; automatic GO TO capability

Altaz

Yes

Polar

Yes with optional wedge

Eyepiece

26mm Plossl

Finder

8x50

RS232

Yes

Power

18v DC (AC adapter included)

Weight

41lbs

41lbs

Tripod

Standard

Cameras at Millikin


ST-7XME

CCD

Kodak KAF-0402ME + TI TC-237

Pixel Array

765 x 510 pixels, 6.9 x 4.6 mm

Total Pixels

390,000

Pixel Size

9 x 9 microns

Full Well Capactiy (ABG)

~50,000 e-

Full Well Capactiy (NABG)

~100,000 e-

Dark Current

1e-/pixel/sec at 0C

Antiblooming

KAF-0402ME is NABG only ABG optional (KAF-0402LE)

Shutter

Electromechanical

Exposure

0.11 to 36000 seconds, 10ms resolution

Correlated Double Sampling

Yes

A/D Converter

16 bits

A/D Gain

2.6e-/ADU

Read Noise

15e-RMS

Binning Modes

1 x 1, 2 x 2, 3 x 3

Pixel Digitization Rate

Up to 420,000 pixels per second

Full Frame Acquisition

~35 seconds

Field of View

12 x 8 arcminutes on f/10 Meade LX 200

Pixel Size

.9 x .9 arcseconds on f/10 Meade LX 200

Limiting Magnitude

Magnitude 14 in 1 second

(for 3 arcsec FWHM stars)

Magnitude 18 in 1 minute

Cooling - standard

Single Stage Thermoelectric, Active Fan, Water Assist Ready -45 C from Ambient Typical

Temperature Regulation

+-0.1 C

Power

5 VDC at 1.5 amps, +-12 VDC at 0.5 amp desktop power supply included

Computer Interface

Parallel

Computer Compatibility

Windows 98/2000/Me/NT/XP

Guiding

Dual CCD Self-Guiding

 

STL-1001E

Imaging CCD

Kodak Enhanced KAF-1001E

Pixel Array

1024 x 1024 pixels, 24.6 x 24.6 mm

Total Pixels

1.0 million

Pixel Size

24 x 24 microns

Full Well Capacity (NAGB)

200,000 e-

Dark Curent

9 e-/pixel/second at 0 degrees C

Antiblooming

NAGB only

Shutter

Electromechanical

Exposure

0.12 to 3600 seconds, 10 ms resolution

Correlated Double Sampling

Yes

A/D Converter

16 bits

A/D Gain

2.0e-/ADU

Read Noise

14.8e-RMS

Binning Modes

1 x 1, 2 x 2, 3 x 3

Full Frame Download

40.8 seconds

Cooling - standard

Two-Stage Thermoelectric, Water Assist, -40 C from Ambient Typical

Temperature Regulation

+-0.1 degrees C

Power

10-18VDC, 12VDC nominal, Universal AC to 12VDC desktop supply

Computer Interface

Parallel

Computer Compatibility

WIndows 98/NT/2000/Me/XP/Mac OS-X

Guiding

Dual CCD Self-Guiding Standard,

 

SGS-Self Guided Spectrograph

Dispersion:

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)

Slit Width

100 microns wide Entrance Slit

Accptance cone angle:

F/6.3 by F/10

Resolution:

Narrow slit & 600 lines/mm

2.4 Angstroms

Narrow slit & 150 lines/mm

10 Angstroms

Wide slit & 600 lines/mm

10 Angstroms

Wide slit & 150 lines/mm

38 Angstroms

Relative Sensitivity to Diffuse Sources:

Narrow slit & 600 lines/mm

1.0

Narrow slit & 150 lines/mm

4.0

Wide slit & 600 lines/mm

4.0

Wide slit & 150/mm

16.0

Dispersion:

1.07 or 4.3 Angstroms per pixel

Resolution

Emission line is recorded with 2.4, 10 or 38 Angstroms Full Width at Half Maximum

Spectral coverage per frame

About 750 Angstroms with the high resolution grating, or 32000 with the low resolution grating

Center Wavelength Selection

Calibrated Micrometer Adjustment

Wavelenght Range

3800 to 7500 Angstroms

Sensitivity

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.

Entrance Slit

18 micron (2.3 arcseconds wide with 63 inch focal length telescope or 72 microns

Uses:

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

 
 
Millikin University - Decatur, IL
 
Millikin University - Decatur, IL
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