dc.contributor.author |
Gothe, K. S |
|
dc.contributor.author |
Prabhu, T. P |
|
dc.contributor.author |
Vishwanath, P. R |
|
dc.contributor.author |
Acharya, B. S |
|
dc.contributor.author |
Srinivasan, R |
|
dc.contributor.author |
Chitnis, V. R |
|
dc.contributor.author |
Kamath, P. U |
|
dc.contributor.author |
Srinivasulu, G |
|
dc.contributor.author |
Saleem, F |
|
dc.contributor.author |
Kemkar, P. M. M |
|
dc.contributor.author |
Mahesh, P. K |
|
dc.contributor.author |
Gabriel, F |
|
dc.contributor.author |
Manoharan, J |
|
dc.contributor.author |
Dorji, N |
|
dc.contributor.author |
Dorjai, T |
|
dc.contributor.author |
Angchuk, D |
|
dc.contributor.author |
D'souza, A. I |
|
dc.contributor.author |
Duhan, S. K |
|
dc.contributor.author |
Nagesh, B. K |
|
dc.contributor.author |
Rao, S. K |
|
dc.contributor.author |
Sharma, S. K |
|
dc.contributor.author |
Singh, B. B |
|
dc.contributor.author |
Sudersanan, P. V |
|
dc.contributor.author |
Thsering, M. T |
|
dc.contributor.author |
Upadhya, S. S |
|
dc.contributor.author |
Anupama, G. C |
|
dc.contributor.author |
Britto, R. J |
|
dc.contributor.author |
Cowsik, R |
|
dc.contributor.author |
Saha, L |
|
dc.contributor.author |
Shukla, A |
|
dc.date.accessioned |
2012-11-09T16:11:54Z |
|
dc.date.available |
2012-11-09T16:11:54Z |
|
dc.date.issued |
2013-04 |
|
dc.identifier.citation |
Experimental Astronomy, Vol. 35, No. 3, pp. 489-506 |
en |
dc.identifier.issn |
1572-9508 |
|
dc.identifier.uri |
http://hdl.handle.net/2248/5931 |
|
dc.description |
Restricted Access |
en |
dc.description |
The original publication is available at springerlink.com |
|
dc.description.abstract |
An array of seven atmospheric Cherenkov telescopes was commissioned at a high altitude site in Hanle in the Ladakh region of the Himalayas. The array called HAGAR has been designed to observe celestial γ-rays of energy >100 GeV. Each telescope is altitude-azimuth mounted and carries seven parabolic mirrors whose optic axes are co-aligned with the telescope axis. The telescopes point and track a celestial source using a PC-based drive control system. Two important issues in positioning of each HAGAR telescope are pointing accuracy of telescope axis and co-alignment of mirrors’ optic axes with the telescope axis. We have adopted a three pronged strategy to address these issues, namely use of pointing models to improve pointing accuracy of the telescopes, RA-DEC scan technique to measure the pointing offsets of the mirrors and mechanical fine-tuning of off-axis mirrors by sighting a distant stationary light source. This paper discusses our efforts in this regard as well as the current status of pointing and monitoring of HAGAR telescopes. |
en |
dc.language.iso |
en |
en |
dc.publisher |
Springer |
en |
dc.relation.uri |
http://dx.doi.org/10.1007/s10686-012-9319-9 |
en |
dc.rights |
© Springer |
en |
dc.subject |
Telescope pointing |
en |
dc.subject |
γ-ray astronomy |
en |
dc.subject |
Pointing model |
en |
dc.subject |
Atmospheric Cherenkov telescopes |
en |
dc.title |
Pointing of HAGAR telescope mirrors |
en |
dc.type |
Article |
en |