iTelescope - T20 - Wide Field - Utah

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Location Information

Observatory:   Utah Desert Remote Observatory at Great Basin Desert, Beryl Junction, Utah, USA

MPC: U94 

Telescope:  0.1-m f/5.0 astrograph + CCD

Timezone:  UTC Minus 7:00. Daylight savings time is observed 

Minimum Target Elevation: 15º all azimuths. 

N 37° 44’ 16"    Decimal: 37.7378 North

W 113° 41’ 51"  Decimal: -113.6975 West

Elevation: 1,570 meters / 5150 ft

Operational Notes

Very Wide Field Telescope. Typically used for Wide Field RGB / Narrowband Imaging. FITS and TIF file formats. Dark Frame calibration data is available for  60, 120, 180, 300 second exposures. Binx1 - Binx2. Recommended Maximum Exposure 300 seconds.  Raw data can be found at

  • T20 is a great platform for wide angle imaging and nothing can match its very wide field portraits and its performance on the sky's larger extended objects such as large nebula, clusters, bright comets and even catching fast moving Near Earth Objects.
  • IMPORTANT NOTES: T20 is unguided. Please limit sub-exposure times to 300 seconds or less for best results. We recommend using the 'Dithering' imaging option on T20 to remove any column defects during your post processing.

Instrument Package

CCD:  SBIG STL-11000

QE: 50% Peak

Full Well:  ~50,000e-  Anti Blooming Gate (ABG)

Dark Current:   0.5 e-/pixel/sec. @ 0º C

A/D Gain:  2.2e-/ADU

Pixel Size:  9um Square

Resolution:  3.5 arc-secs/pixel

Sensor:  Frontlit 

Cooling:  Set to -15ºC default 

Array:  4008 by 2672 (10.7 Mega pixels) 

FOV:      155.8 x 233.7 arc-mins

Filters:  LRGB, Ha (3nm), SII (3nm) & OIII (5nm), V

Position Angle: 358.4º East of North


Telescope Optics

OTA: Takahashi FSQ-ED 

Optical Design: Petzval Apochromat Astrograph 

Aperture: 106mm (0.1 metre) 

Focal Length: 530mm (0.53 metre) 

F/Ratio: f/5.0 

Guiding: External 

Mount: Paramount ME