iTelescope - T5 - Medium Deep Space - Utah

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Location Information

Observatory: Utah Desert Remote Observatory at Great Basin Desert, Beryl Junction, Utah, USA
MPC: U94

Telescope:  0.25-m f/3.4 reflector + CCD

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

Minimum Target Elevation: 15º all azimuths except noted. 34º elevation for azimuths 220-320º.

N 37° 44’ 16"    Decimal: 37.7378 North

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

Elevation: 1,570 meters / 5150 ft

Operational Notes

Medium Wide - Deep Field. Entry level Science Platform.  Typically used for Science Missions. Photometry and Narrowband Imaging. FITS and TIF file formats. Raw data can be found at

  • Dark Frame calibration data is available for  60, 120, 180, 300, 600  second exposures. Binx1 - Binx2. Non Anti Bloom Gate (NABG) CCD. Bright stars will bloom or bleed in long exposures.  Recommended Maximum Exposure 600 seconds.
  • T5 is one of the busiest remote telescopes on the iTelescope Network. It allows its many drivers to gather valuable science data with its moderate wide angle FoV and sharp Takahashi optics. Coupled with its ST10XME CCD NABG camera, T5 can go very deep and wide with ease and very high reliability. But care should be taken by those new to NABG cameras.
  • Keep your exposures short if very bright stars are in your target FoV. Trial and error can help you fine tune exposure times as well and the right processing tools to repair the image and remove blooming if necessary.
  • IMPORTANT NOTES: T5 is Externally Guided: Please limit sub-exposure times to 300 seconds or less for best results. 

Instrument Package


QE: 85% Peak

Full Well:  ~100,000e-  NABG

Dark Current:   ~1e- / pixel / sec at 0°

A/D Gain:  1.3e-/ADU

Pixel Size:  6.8um Square

Sensor:  Frontlit 

Cooling:  Set to -15c default 

Array:  2184 x 1472 (3.2 Megapixels) 

Filters:  Red Green Blue, Ha, SII, OIII, Clear and Johnson's Cousin's Photometric B,V, and I filters.

Size:60.6 x 40.8 arcmin
Radius:0.609 deg
Pixel scale:1.65 arcsec/pixel
Orientation:Up is 177 degrees E of N

Telescope Optics

OTA: Takahashi Epsilon 250

Optical Design: Hyperbolic Flat-Field Astrograph 

Aperture: 250mm

Focal Length: 850mm

F/Ratio: f/3.4

Guiding: External 

Mount: Paramount PME