iTelescope - T7 - Deep Field - Spain


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Location Information


Observatory:  AstroCamp at Nerpio, Spain - MPC Code - I89

Telescope:   0.43-m f/6.8 reflector + CCD

Timezone:  UTC +1:00 Madrid Daylight Savings Time is Observed

Minimum Target Elevation: Approx 35 - 45 Degrees


North: 38° 09’ - West: 002° 19’   

Elevation: 1650m 


Operational Notes


Deep Field Telescope. Hybrid Science Platorm. Typically used for RVB / Narrowband Imaging, but also carries Photometric V and I filters. FITS and TIF file formats. Dark Frame calibration data is available for  60, 120, 180, 300  second exposures. Binx1 - Binx2.  Raw data can be found at data.itelescope.net.


  • Recommended Maximum Exposure 300 seconds.
  • T7 is a 17" Science platform utilising a large format STL11000M CCD. This is an ABG camera so it lends itself to long exposures on a wide variety of targets. T7 is populated with photometric RVB filters so it stands well in the science stakes as well as a set of narrowband units for amazing Hubble palette imaging. Care however should be taken when using T7 for photometry as its CCD is of the ABG variety. So users should make sure they don't saturate the image as result may not be linear.
  • IMPORTANT NOTES: T7 is externally Guided: Please limit sub-exposure times to 300 seconds or less for best results. T7 is not recommended as a pure Imaging platform.


Instrument Package


CCD:  SBIG STL-11000M

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:  0.63 arc-secs/pixel

Sensor:  Frontlit 

Cooling:  Set to -20ºC default 

Array:  4008 by 2672 (10.7 Mega pixels) 

FOV:      28.2 x 42.3 arc-mins

Filters: Luminance, R, V, B, Ha, Oiii, SII, I

Position Angle: 272º


Telescope Optics


OTA: Planewave 17" CDK 

Optical Design: Corrected Dall-Kirkham Astrograph 

Aperture: 431mm

Focal Length: 2929mm

F/Ratio: f/6.8 

Guiding: External 

Mount: Paramount PME


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Additional Filter Information


1- L Luminance, Baader (UV/IR cut)
2- R-Johnson, Custom Scientific  
3- V-Johnson, Custom Scientific  
4- B-Johnson, Custom Scientific
5- Ha-7nm, Baader (see graph)
6- OIII-8.5nm, Baader (see graph)
7- SII-8nm, Baader (see graph)
8- I-Johnson, Custom Scientific 

Baader narrow band graphs (http://tinyurl.com/dxwxgdn) 


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Transformation Coefficients T7 


Tbv= 1.268 ; standard deviation= .004 

Tvr= 1.028 ; standard deviation= .009 

Tri= 0.852 ; standard deviation= .009 

Tb= 0.114 ; standard deviation= .002 

Tv= -0.192 ; standard deviation= .009 

Tr= -0.265 ; standard deviation= .006


These use the following definitions (lower case are instrument magnitudes; upper case are reference magnitudes of M67 from Arne Henden’s standard field available at http://binaries.boulder.swri.edu/fields/m67.html )


Tb= slope of (B-b)/(B-V) 

Tv= slope of (V-v)/(V-R) 

Tr= slope of (R-r)/(R-I)

Tij=1 / slope of (i-j)/(I-J)