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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 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.[citation needed]

Photometric systems are usually characterized according to the widths of their passbands:

Photometric letters

Each letter designates a section of light of the electromagnetic spectrum; these cover well the consecutive major groups, near-ultraviolet (NUV), visible light (centered on the V band), near-infrared (NIR) and part of mid-infrared (MIR).[a] 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.[b]

With the advent of infrared detectors in the next decade, 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).[6]

Combinations of these letters are frequently used; for example the combination JHK has been used more or less as a synonym of "near-infrared", and appears in the title of many papers.[7]

Filters used

The filters currently being used by other telescopes or organizations.

Units of measurements:

Note: colors are only approximate and based on wavelength to sRGB representation (when possible).[24]

See also

References and footnotes

  1. ^ Spectral Colors
  2. ^ a b Binney, J.; Merrifield M. Galactic Astronomy, Princeton University Press, 1998, ch. 2.3.2, pp. 53
  3. ^ Bessell, Michael S. (September 2005). "Standard Photometric Systems" (PDF). Annual Review of Astronomy and Astrophysics. 43 (1): 293–336. Bibcode:2005ARA&A..43..293B. doi:10.1146/annurev.astro.41.082801.100251. ISSN 0066-4146.
  4. ^ Gouda, N.; Yano, T.; Kobayashi, Y.; Yamada, Y.; et al. (23 May 2005). "JASMINE: Japan Astrometry Satellite Mission for INfrared Exploration". Proceedings of the International Astronomical Union. 2004 (IAUC196): 455–468. Bibcode:2005tvnv.conf..455G. doi:10.1017/S1743921305001614. S2CID 123261288. z-band: 0.9 μm
  5. ^ a b [1] Handbook of Geophysics and the Space Environment 1985, Air Force Geophysics Laboratory, 1985, ed. Adolph S. Jursa, Ch. 25, Table 25-1
  6. ^ "Light wavelength to RGB Converter". www.johndcook.com. Retrieved 2023-07-28.
  7. ^ Monson, Andrew J.; Pierce, Michael J. (2011). "Near-Infrared (Jhk) Photometry of 131 Northern Galactic Classical Cepheids". The Astrophysical Journal Supplement Series. 193 (1): 12. Bibcode:2011ApJS..193...12M. doi:10.1088/0067-0049/193/1/12. Example of use of J for "near-infrared"
  8. ^ A study of the Chamaeleon I dark cloud and T-association. II – High-resolution IRAS maps around HD 97048 and 97300, Assendorp, R.; Wesselius, P. R.; Prusti, T.; Whittet, D. C. B., 1990
  9. ^ ADPS
  10. ^ DES
  11. ^ ADPS
  12. ^ Jordi, C.; Gebran, M.; Carrasco, J. M.; de Bruijne, J.; Voss, H.; Fabricius, C.; Knude, J.; Vallenari, A.; Kohley, R.; Mora, A. (2010). "Gaia broad band photometry". Astronomy and Astrophysics. 523: A48. arXiv:1008.0815. Bibcode:2010A&A...523A..48J. doi:10.1051/0004-6361/201015441. S2CID 34033669.
  13. ^ "GALEX Instrument Summary". Goddard Space Flight Center. Retrieved 5 June 2019.
  14. ^ "HAWC". Archived from the original on 2008-03-13. Retrieved 2008-05-25.
  15. ^ NSFCAM
  16. ^ "ISAAC Overview". Paranal Instrumentation. ESO. Retrieved 13 October 2011.
  17. ^ LSST filter characteristics taken from https://github.com/lsst/throughputs/blob/master/baseline/ (see the filter_X.dat files) with the limits at half the peak transmission.
  18. ^ About INTEGRAL
  19. ^ Tonry, J. L.; Stubbs, C. W.; Lykke, K. R.; Doherty, P.; Shivvers, I. S.; Burgett, W. S.; Chambers, K. C.; Hodapp, K. W.; Kaiser, N.; Kudritzki, R.-P.; Magnier, E. A.; Morgan, J. S.; Price, P. A.; Wainscoat, R. J. (2012). "THE Pan-STARRS1 PHOTOMETRIC SYSTEM". The Astrophysical Journal. 750 (2): 99. arXiv:1203.0297. Bibcode:2012ApJ...750...99T. doi:10.1088/0004-637X/750/2/99. S2CID 119266289.
  20. ^ Pajot, F.; Stepnik, B.; Lamarre, J.-M.; Bernard, J.-P.; Dupac, X.; Giard, M.; Lagache, G.; Leriche, B.; Meny, C.; Recouvreur, G.; Renault, J.-C.; Rioux, C.; Ristorcelli, I.; Serra, G.; Torre, J.-P. (2006). "Calibration of the PRONAOS/SPM submillimeter photometer" (PDF). Astronomy & Astrophysics. 447 (2): 769–781. Bibcode:2006A&A...447..769P. doi:10.1051/0004-6361:20034226. S2CID 4822401.
  21. ^ MSXPSC – Midcourse Space Experiment (MSX) Point Source Catalog, V2.3
  22. ^ XMM-Newton User's Handbook Sect. 3.5.3.1
  23. ^ Audard, M.; Briggs, K. R.; Grosso, N.; Güdel, M.; Scelsi, L.; Bouvier, J.; Telleschi, A. (2007). "The XMM-Newton Optical Monitor survey of the Taurus molecular cloud". Astronomy & Astrophysics. 468 (2): 379–390. arXiv:astro-ph/0611367. Bibcode:2007A&A...468..379A. doi:10.1051/0004-6361:20066320. S2CID 59479808.
  24. ^ "Light wavelength to RGB Converter". www.johndcook.com. Retrieved 2023-07-28.
  1. ^ Indigo and cyan are not standard colors.[1] Orange, yellow, and green fall under visual bands, while violet and purple are in every blue band.
  2. ^ See Description column of the chart
  3. ^ The width of the band of the curve's 50% upper values (that is, peak) for a natural curve of paradigm source of this light
  4. ^ Delta lambda

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