From Main Axes Control to Flexible Body Control of Large Telescope Structures

2021 ◽  
Author(s):  
Hans J. Kärcher
Keyword(s):  
Flexible Body ◽  
Large Telescope

B. Large Telescope Engineering Operations

1966 ◽  
Vol 27 ◽  
pp. 200-209
Keyword(s):  
Large Telescope ◽  
Advance Planning

Whitford : The next phase of the program has to do with advance planning of the instruments themselves, to make the logistics of operation simple and foolproof. I call first on Mr Rule to speak on ‘thinking ahead’.

scholarly journals Control oriented modelling and modal analysis of the deformable mirror M4 of the extremely large telescope

2021 ◽  
Vol 27 (1) ◽  
pp. 295-321
Author(s):  
Philip L. Neureuther ◽  
Kevin Schmidt ◽  
Thomas Bertram ◽  
Oliver Sawodny
Keyword(s):  
Modal Analysis ◽  
Deformable Mirror ◽  
Large Telescope

scholarly journals Successful application of PSF-R techniques to the case of the globular cluster NGC 6121 (M 4)

2020 ◽  
Vol 634 ◽  
pp. L5 ◽  
Author(s):  
D. Massari ◽  
A. Marasco ◽  
O. Beltramo-Martin ◽  
J. Milli ◽  
G. Fiorentino ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Globular Cluster ◽  
Hybrid Technique ◽  
Large Telescope ◽  
Point Spread ◽  
Accurate Knowledge ◽  
Viable Solution ◽  
Spread Function ◽  
Astronomical Images ◽  
Proper Analysis

Context. Precise photometric and astrometric measurements on astronomical images require an accurate knowledge of the point spread function (PSF). When the PSF cannot be modelled directly from the image, PSF-reconstruction techniques become the only viable solution. So far, however, their performance on real observations has rarely been quantified. Aims. In this Letter, we test the performance of a novel hybrid technique, called PRIME, on Adaptive Optics-assisted SPHERE/ZIMPOL observations of the Galactic globular cluster NGC 6121. Methods. PRIME couples PSF-reconstruction techniques, based on control-loop data and direct image fitting performed on the only bright point-like source available in the field of view of the ZIMPOL exposures, with the aim of building the PSF model. Results. By exploiting this model, the magnitudes and positions of the stars in the field can be measured with an unprecedented precision, which surpasses that obtained by more standard methods by at least a factor of four for on-axis stars and by up to a factor of two on fainter, off-axis stars. Conclusions. Our results demonstrate the power of PRIME in recovering precise magnitudes and positions when the information directly coming from astronomical images is limited to only a few point-like sources and, thus, paving the way for a proper analysis of future Extremely Large Telescope observations of sparse stellar fields or individual extragalactic objects.

Science with the re-baselined European Extremely Large Telescope

2012 ◽  
Author(s):  
J. Liske ◽  
P. Padovani ◽  
M. Kissler-Patig
Keyword(s):  
Large Telescope

Near-infrared spectrograph for a large telescope

1995 ◽  
Author(s):  
Bruce Atwood ◽  
Paul L. Byard ◽  
Darren L. DePoy ◽  
J. Frogel ◽  
Thomas P. O'Brien ◽  
...  
Keyword(s):  
Near Infrared ◽  
Large Telescope

The Japanese National Large Telescope

1991 ◽  
Vol 9 (1) ◽  
pp. 52-54 ◽  
Author(s):  
Tomakazu Kogure ◽  
Keiichi Kodaira
Keyword(s):  
International Collaboration ◽  
New Technologies ◽  
Study Phase ◽  
Large Telescope ◽  
High Quality ◽  
Quality Performance ◽  
Final Study ◽  
Technical Features ◽  
Active Mirror

AbstractThe Japanese National Large Telescope is an 8-metre class optical-infrared reflector with a monolithic thin meniscus mirror, to be constructed at the Mauna Kea summit, Hawaii. The JNLT will be characterised by high quality performance in the optical and infrared regions, achieved by adopting new technologies such as active mirror support, fast optics and a thermally controlled dome. In particular, high infrared qualities are regarded as the most important characteristics among various design goals.The JNLT project is now close to the final study phase before construction. This paper reviews the scientific motivations and the special technical features of the JNLT. Finally, the promotion of international collaboration around the JNLT is emphasised.

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