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"Simons, Douglas"
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The Gemini Near‐Infrared Imager (NIRI)
This paper presents the basic design of the Gemini Near‐Infrared Imager (NIRI) and discusses its capabilities. NIRI offers three different pixel scales to match different operating modes of the Gemini telescope and allows polarimetric and spectroscopic observations. It is equipped with an infrared on‐instrument wave‐front sensor (OIWFS) to allow tip‐tilt and focus correction even in highly obscured regions. The science detector array is an Aladdin II InSb
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pixel device sensitive from 1.0 to 5.5 μm.
Journal Article
DIVISION IX / COMMISSION 25 / WORKING GROUP INFRARED ASTRONOMY
As we have noted before, the WG-IR was created following a Joint Commission Meeting at the IAU General Assembly in Baltimore in 1988, a meeting that provided both diagnosis and prescription for the perceived ailments of infrared photometry at the time. The results were summarized in Milone (1989). The challenges involve how to explain the failure to systematically achieve the milli-magnitude precision expected of infrared photometry and an apparent 3% limit on system transformability. The proposed solution was to re-define the broadband Johnson system, the passbands of which had proven so unsatisfactory that over time effectively different systems proliferated although bearing the same JHKLMNQ designations; the new system needed to be better positioned and centered in the atmospheric windows of the Earth's atmosphere, and the variable water vapour content of the atmosphere needed to be measured in real time to better correct for atmospheric extinction.
Journal Article
DIVISION IX / COMMISSION 25 / WORKING GROUP INFRARED ASTRONOMY
The WG-IR was created following a Joint Commission Meeting at the IAU General Assembly in Baltimore in 1988, a meeting that provided both diagnosis and prescription for the perceived ailments of infrared photometry at the time. The results were summarized in Milone (1989). The challenges involve how to explain the failure to systematically achieve the milli-magnitude precision expected of infrared photometry and an apparent 3% limit on system transformability. The proposed solution was to redefine the broadband Johnson system, the passbands of which had proven so unsatisfactory that over time effectively different systems proliferated although bearing the same JHKLMNQ designations; the new system needed to be better positioned and centered in the atmospheric windows of the Earth's atmosphere, and the variable water vapour content of the atmosphere needed to be measured in real time to better correct for atmospheric extinction.
Journal Article
Instruments, Detectors and the Future of Astronomy with Large Ground Based Telescopes
Results of a survey of instrumentation and detector systems, either currently deployed or planned for use at telescopes larger than 3.5 m, in ground based observatories world-wide, are presented. This survey revealed a number of instrumentation design trends at optical, near, and mid-infrared wavelengths. Some of the most prominent trends include the development of vastly larger optical detector systems (> 109 pixels) than anything built to date, and the frequent use of mosaics of near-infrared detectors – something that was quite rare only a decade ago in astronomy. Some future science applications for detectors are then explored, in an attempt to build a bridge between current detectors and what will be needed to support the research ambitions of astronomers in the future.
Journal Article
Memorial 5K Honors Fallen Combat Camera Marines
The run was held on the one-year anniversary of the helicopter crash in Nepal that took the lives of six Marines, including Corporal Sara A. Medina, a 23-yearold combat photographer, and Lance Corporal Jacob A. Hug, a 22-year-old combat videographer, while participating in Operation Sahayogi Haat earthquake relief efforts on May 12, 2015.
Trade Publication Article
Okinawa Fire Department Thanks Camp Foster PMO
Working together with their Japanese neighbors allows Marine Corps Installations Pacific to strengthen power projection with our allies and partners, enabling us to preserve regional peace, stability and security and promote operating force readiness.
Trade Publication Article
DIVISION IX / COMMISSION 25 / WORKING GROUP INFRARED ASTRONOMY
The formal commissioning of the IRWG occurred at the 1991 Buenos Aires General Assembly, following a Joint Commission meeting at the IAU GA in Baltimore in 1988 that identified the problems with ground-based infrared photometry. The meeting justification, papers, and conclusions, can be found in Milone (1989). In summary, the challenges involved how to explain the failure to achieve the milli-magnitude precision expected of infrared photometry and an apparent 3% limit on system transformability. The proposed solution was to redefine the broadband Johnson system, the passbands of which had proven so unsatisfactory that over time effectively different systems proliferated, although bearing the same “JHKLMNQ” designations; the new system needed to be better positioned and centered in the spectral windows of the Earth's atmosphere, and the variable water vapour content of the atmosphere needed to be measured in real time to better correct for atmospheric extinction.
Journal Article
DIVISION IX / COMMISSION 25 / WORKING GROUP: INFRARED ASTRONOMY
The formal origin of the IRWG occured at the Buenos Aires General Assembly, following a Joint Commission meeting at the IAU GA in Baltimore in 1988 that identified the problems with ground-based infrared photometry. The situation is summarized in Milone (1989). In short, the challenges involved how to explain the failure to achieve the milli-magnitude precision expected of infrared photometry and an apparent 3% limit on system transformability. The proposed solution was to redefine the broadband Johnson system, the passbands of which had proven so unsatisfactory that over time effectively different systems proliferated, although bearing the same JHKLMNQ designations; the new system needed to be better positioned and centered in the atmospheric windows of the Earth's atmosphere, and the variable water vapour content of the atmosphere needed to be measured in real time to better correct for atmospheric extinction.
Journal Article
A near-infrared search for brown dwarfs in the Pleiades
Deep mosaic imaging of the Pleiades was conducted at wavelengths of 0.9$\\mu$ m (I-band) and 2.2$\\mu$ m (K-band) in an effort to find free-floating low mass cluster members. Fields outside of the cluster were also imaged as part of a control data set to check the overall significance of the results, leading to a total of 575 arcmin $\\sp2$of data. Photometry of all detected point sources led to the detection of 29$\\pm$13 objects that lie near the lower Pleiades main sequence, when compared to the control data set. These objects have theoretical masses of$\\sim$ 0.1 to 0.04 solar masses and are described well by a power-law distribution with a slope of$-$ 2.8. The vast majority of the sources detected were background field stars. The derived number-magnitude counts for these field stars agree well with established Galaxy models, with a measured lower limit on the local space density of stars of 0.06 pc $\\sp{-3}$ .
Dissertation