نتایج جستجو برای: astronomical observatory
تعداد نتایج: 21523 فیلتر نتایج به سال:
The i-band observing conditions at Dome A on the Antarctic plateau have been investigated using data acquired during 2008 with the Chinese Small Telescope ARray (CSTAR). The sky brightness, atmospheric extinction, cloud coverage and auroral appearance are obtained from these images. The median sky brightness of moonless nights is about 20.46 mag arcsec in the Sloan Digital Sky Survey (SDSS) i b...
We present a method to analyze binary-lens microlensing light curves with one well-sampled fold caustic crossing. In general, the surface of χ shows extremely complicated behavior over the 9-parameter space that characterizes binary lenses. This makes it difficult to systematically search the space and verify that a given local minimum is a global minimum. We show that for events with well-moni...
The United States Virtual Astronomical Observatory program is the operational facility successor to the National Virtual Observatory development project. The primary goal of the US VAO is to build on the standards, protocols, and associated infrastructure developed by NVO and the International Virtual Observatory Alliance partners and to bring to fruition a suite of applications and web-based t...
The U.S. Virtual Astronomical Observatory (VAO) is a product-driven organization that provides new scientific research capabilities to the astronomical community. Software development for the VAO follows a lightweight framework that guides development of science applications and infrastructure. Challenges to be overcome include distributed development teams, part-time efforts, and highly constr...
This paper presents an analysis of the optical night sky brightness and extinction coefficient measurements in UBVRI at the Indian Astronomical Observatory (IAO), Hanle, during the period 2003−2008. They are obtained from an analysis of CCD images acquired at the 2 m Himalayan Chandra Telescope (HCT) at IAO. Night sky brightness was estimated using 210 HFOSC images obtained on 47 nights and cov...
A pulsar timing system has been operating in the 18-cm band at the Urumqi Astronomical Observatory 25-m telescope since mid-1999. Frequency resolution allowing dedispersion of the pulsar signals is provided by a 2×128×2.5 MHz filterbank/digitiser system. Observations of 74 pulsars over more than 12 months have resulted in updated pulsar periods and period derivatives, as well as improved positi...
Most distant and ancient supernovae discovered by the Subaru Telescope. In the image, which show the Subaru Deep Field, numerous supernovae related to white dwarfs were found, and ten of them had exploded more than ten billion years ago. This discovery gives an important clue to study how the heavy elements created in the ancient universe (Graur et al.
DevOps is the contemporary term for a software development culture that purposefully blurs distinction between software development and IT operations by treating “infrastructure as code.” DevOps teams typically implement practices summarised by the colloquial directive to “eat your own dogfood;” meaning that software tools developed by a team should be used internally rather thrown over the fen...
1 Instituto Nacional de Astrofísica, Óptica y Electrónica, Puebla, Mexico, 2 Department of Physics and Astronomy, University of Sheffield, Sheffield, United Kingdom, 3 NASA Ames Research Center, SOFIA Science Center, SOFIA/USRA, Mountain View, CA, United States, 4 Department of Astronomy, University of Texas at Austin, Austin, TX, United States, 5 McDonald Observatory, University of Texas at Au...
The Image Reduction and Analysis Facility is a scientific image processing package widely used throughout the astronomical community. IRAF has been developed and distributed by the National Optical Astronomy Observatory in Tucson, Arizona since the early 1980’s. Other observatories and projects have written many dozens of layered external application packages. More than ten thousand journal art...
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