The night-sky at the Calar Alto Observatory II: The sky at the near infrared [PDF]
, 2008 We present here the characterization of the night sky-brightness at the near-infrared, the telescope seeing, and the fraction of useful time at the Calar Alto observatory.
Birkle K. +16 more
core +3 more sources
The night-sky at the Calar Alto Observatory [PDF]
, 2007 We present a characterization of the main properties of the night-sky at the Calar Alto observatory for the time period between 2004 and 2007. We use optical spectrophotometric data, photometric calibrated images taken in moonless observing periods ...
Burki G. +17 more
core +3 more sources
Astronomical seeing at Maidanak Observatory
Научные труды Института астрономии РАН, 2023 Атмосферное качество астрономического изображения было исследовано с помощью прибора DIMM — измерите- ля дифференциальных дрожаний звезд для оценки интегральной турбулентности над обсерваторией. Была также изучена приземная составляющая данного параметра путем сравнения оценок качества изображения, полученного на разных высотах.
openaire +1 more source
Benefits of Intelligent Fuzzy Controllers in Comparison to Classical Methods for Adaptive Optics
Photonics, 2023 Adaptive Optics (AO) systems have been developed throughout recent decades as a strategy to compensate for the effects of atmospheric turbulence, primarily caused by poor astronomical seeing.
Victor Costa, Wesley Beccaro
doaj +1 more source
Thermalizing a telescope in Antarctica: Analysis of ASTEP observations [PDF]
, 2015 The installation and operation of a telescope in Antarctica represent particular challenges, in particular the requirement to operate at extremely cold temperatures, to cope with rapid temperature fluctuations and to prevent frosting.
Abe, Lyu +15 more
core +4 more sources
Laser-only adaptive optics achieves significant image quality gains compared to seeing-limited observations over the entire sky [PDF]
, 2017 Adaptive optics laser guide star systems perform atmospheric correction of stellar wavefronts in two parts: stellar tip-tilt and high-spatial-order laser-correction.
Baranec, Christoph +4 more
core +4 more sources
MEMS-based Speckle Spectrometer [PDF]
, 2006 We describe a new concept for a MEMS-based active spatial filter for astronomical spectroscopy. The goal of this device is to allow the use of a diffraction-limited spectrometer on a seeing limited observation at improved throughput over a comparable ...
Kuhlen, M. Q., Nigra, L., Sheinis, A. I.
core +2 more sources
El Roque de Los Muchachos Site Characteristics. II. Analysis of Wind, Relative Humidity and Air Pressure [PDF]
, 2007 In this paper we present an analysis of wind speed, wind direction, relative humidity and air pressure taken at TNG, CAMC and NOT at Observatorio del Roque de Los Muchachos, in the Canary Islands.
Brandt P. N. +4 more
core +3 more sources
KEBIJAKAN PEMERINTAH DALAM PENETAPAN AWAL BULAN KAMARIAH DI INDONESIA
Jurnal Madania, 2014 Governmental Policy in Deducing Early Islamic Calendar in Indonesia. There is different argumentation among Muslim scholars to determine early Islamic Calendar. Part of them argued that we should put it considerably based on the result of seeing moon (ru’
Jayusman Jayusman
doaj +1 more source
Seeking the Local Convergence Depth. I. TF Observations of the Clusters A168, A397, A569, A1139, A1228, and A1983 [PDF]
, 1997 We present first results of an all-sky observing program designed to improve the quality of the I band Tully-Fisher (TF) template and to obtain the reflex motion of the Local Group with respect to clusters to z = 0.06.
Campusano, Luis E. +5 more
core +2 more sources