In infrared astronomy , the K band is an atmospheric transmission window centered on 2.2 μm (in the near-infrared 136 THz range). HgCdTe -based detectors are typically preferred for observing in this band.
5-460: Photometric systems used in astronomy are sets of filters or detectors that have well-defined windows of absorption, based around a central peak detection frequency and where the edges of the detection window are typically reported where sensitivity drops below 50% of peak. Various organizations have defined systems with various peak frequencies and cutoffs in the K band, including K ′ , and K S , and K dark . This astronomy -related article
10-467: A set of primary standard stars is provided. A commonly adopted standardized photometric system is the Johnson-Morgan or UBV photometric system (1953). At present, there are more than 200 photometric systems. Photometric systems are usually characterized according to the widths of their passbands: Each letter designates a section of light of the electromagnetic spectrum ; these cover well
15-432: Is a stub . You can help Misplaced Pages by expanding it . This physics -related article is a stub . You can help Misplaced Pages by expanding it . Photometric system In astronomy , a photometric system is a set of well-defined passbands (or optical filters ), with a known sensitivity to incident radiation. The sensitivity usually depends on the optical system, detectors and filters used. For each photometric system
20-556: The J to N bands were labelled following on from near-infrared's closest-to-red band, I. Later the H band was inserted, then Z in the 1990s and finally Y, without changing earlier definitions. Hence, H is out of alphabetical order from its neighbours, while Z,Y are reversed from the alphabetical – higher-wavelength – sub-series which dominates current photometric bands. Note: colors are only approximate and based on wavelength to sRGB representation (when possible). Combinations of these letters are frequently used; for example
25-414: The consecutive major groups, near- ultraviolet (NUV), visible light (centered on the V band), near- infrared (NIR) and part of mid-infrared (MIR). The letters are not standards, but are recognized by common agreement among astronomers and astrophysicists . The use of U,B,V,R,I bands dates from the 1950s, being single-letter abbreviations. With the advent of infrared detectors in the next decade,
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