Girawali Observatory
Encyclopedia
IUCAA Girawali Observatory is an optical astronomy observatory run by the Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune
. The Observatory is located about 80 km from Pune City, off the Pune Nashik Highway.
provided funding for the project.
A contract was signed with the Particle Physics and Astronomy Research Council (PPARC) of the United Kingdom, which gave the contract to the Telescope Technologies Ltd of Liverpool, UK.
The telescope was installed, calibrated and handed over to the team at IUCAA on February 14, 2006. The Observatory was formally inaugrated and the Telescope dedicated to the Astronomy community by Prof. Yash Pal
on May 13, 2006. After a phase of performance and science verification, the Observatory was opened for regular observations in November, 2006.
secondary mirror of 62 cm with f/10. It has 1 direct and 4 side Cassegrain ports with an uncorrected field of view (direct) of 6 arcminute radius.
IFOSC's capabilities are further enhanced with imaging polarimetric as well as spectropolarimetric modes with a reduced field of view of about 2 arcminute radius.
A calibration unit provides a set of lamps for flat field and spectral calibration. A set of five narrow band filters of 8.0 nm FWHM, are also housed in the calibration unit. These are particularly suitable for local and red-shifted H-alpha studies, having nominal central wavelengths of 656.3, 660.3 , 664.3 , 668.3 and 672.3.
This sensor can operate with a 14-bit ADC and still achieve the same full well. The full well is the total electrons per count, so in this case the gain is ~4.6. The downfall with running this CCD in this config is the 2x2 bin. You must set it up to run with an attenuation if trying to run in other speeds and binnings.
Pune
Pune , is the eighth largest metropolis in India, the second largest in the state of Maharashtra after Mumbai, and the largest city in the Western Ghats. Once the centre of power of the Maratha Empire, it is situated 560 metres above sea level on the Deccan plateau at the confluence of the Mula ...
. The Observatory is located about 80 km from Pune City, off the Pune Nashik Highway.
History
The Inter-University Centre for Astronomy and Astrophysics (IUCAA) felt the need of an optical telescope for observation, research, training and for the University community. Therefore, a proposal was made to setup a medium sized optical telescope, preferably close to the IUCAA campus in Pune. The University Grants CommissionUniversity Grants Commission (India)
The University Grants Commission of India is a statutory organisation set up by Union government in 1956, for the coordination, determination and maintenance of standards of university education. It provides recognition for universities in India, and provides funds for government-recognised...
provided funding for the project.
A contract was signed with the Particle Physics and Astronomy Research Council (PPARC) of the United Kingdom, which gave the contract to the Telescope Technologies Ltd of Liverpool, UK.
The telescope was installed, calibrated and handed over to the team at IUCAA on February 14, 2006. The Observatory was formally inaugrated and the Telescope dedicated to the Astronomy community by Prof. Yash Pal
Yash Pal
Yash Pal is an Indian scientist and educator. He was raised in Pai, Kaithal, Haryana , graduated with a degree in physics from Panjab University, Chandigarh in 1949 and gained a PhD degree in Physics from the Massachusetts Institute of Technology in 1958.Yash Pal has held many positions within...
on May 13, 2006. After a phase of performance and science verification, the Observatory was opened for regular observations in November, 2006.
Location
The Observatory is located near Junnar, 80 km from Pune City, off the Pune Nashik Road. It is located close to Girawali Village and is on top of a small hill that is part of a Reserved Forest.Telescope
The main 2m telescope at IGO is made up of a primary mirror of 200 cm with f/3 and asecondary mirror of 62 cm with f/10. It has 1 direct and 4 side Cassegrain ports with an uncorrected field of view (direct) of 6 arcminute radius.
IFOSC
The IUCAA Faint Object Spectrograph and Camera (IFOSC) is the main instrument available on the telescope's main Cassegrain port. IFOSC employs an EEV 2K x 2K, thinned, back-illuminated CCD with 13.5 micrometer pixels. The spatial sampling scale at the detector is 44μm per arcsecond giving a field of view of about 10.5 arcminutes on the side. In addition to Ultra-violet,Blue,Violet,Red,Infrared imaging and photometric capabilities, IFOSC offers a range of grisms with resolutions ranging from 190 to 3700 covering the wavelength region of 350-850 nm. Long slit, slitless, multislit and Echelle (with cross-disperser) modes are available offering a wide range of observational possibilities.IFOSC's capabilities are further enhanced with imaging polarimetric as well as spectropolarimetric modes with a reduced field of view of about 2 arcminute radius.
A calibration unit provides a set of lamps for flat field and spectral calibration. A set of five narrow band filters of 8.0 nm FWHM, are also housed in the calibration unit. These are particularly suitable for local and red-shifted H-alpha studies, having nominal central wavelengths of 656.3, 660.3 , 664.3 , 668.3 and 672.3.
PI-CCD
The Princeton Instruments CCD (PI-CCD) camera is mounted on one of the side ports. The camera employs a 1340x1300 pixel, thinned, back-illuminated E2V CCD. The 20μm pixels give better spatial sampling than IFOSC. A set of Ultra-violet, Blue, Violet, Red, Infrared filters identical to those used in IFOSC is available for this instrument. A summary of the instrument parameters are given below:- Pixels: 1340 x 1300, 20μm square
- Image Scale: 97μm per arcsecond (0.2 arcsecond per pixel)
- On chip binning: 2x2
- Single Pixel Full Well: 300ke
- Dynamic range: 16 bits
This sensor can operate with a 14-bit ADC and still achieve the same full well. The full well is the total electrons per count, so in this case the gain is ~4.6. The downfall with running this CCD in this config is the 2x2 bin. You must set it up to run with an attenuation if trying to run in other speeds and binnings.