Langbahn Team – Weltmeisterschaft

Calibrator star

The star 2MASS J17554042+6551277, which was used as a calibrator star by the James Webb Space Telescope

A calibrator star is a star that is typically used tor calibration purposes on high-sensitized sensors located on space telescopes.

Calibrator stars do not usually follow a specific criteria, but are normally hand-picked for different reasons.

Definition

Infrared and optically bright stars may be observed for calibration purposes by satellites, particularly those with sensitivity to both infrared and visible radiation. The stars chosen generally meet the following criteria: they have a visual manitude that is eual to or less than +6, and an IR brightness (in the 1-5 micrometer range) greater than that of Vega.[1][2]

The stars are strictly southern objects (i.e., their declinations are negative), and most are cool stars of spectral classes K and M. While these are not the only stars that might serve for these purposes, they are well distributed across the southern sky and some should be visible at all times.[1]

List

Name Image Telescope used Date Reference
HD 96755 Hubble Space Telescope May 1990 [3]
TrES-2 Kepler Space Telescope 2008 [4]
R Doradus Transiting Exoplanet Survey Satellite August 7, 2018 [5]
2MASS J17554042+6551277 James Webb Space Telescope July 12, 2022 [6]

Catalog

A catalog of recommended calibrator stars does exist, with 1,510 stars being listed. The catalog gives the magnitude, mass and other statistics.[2]

See also

References

  1. ^ a b Sene, D.E.; Caldwell, W.T.; Grigsby, J.A.; George, J.D.; Evans, H.E.; Emmerich, C.J. (1999). "Calibration stars". 1999 IEEE Aerospace Conference. Proceedings (Cat. No.99TH8403). pp. 297-306 vol.4. doi:10.1109/AERO.1999.792098. ISBN 0-7803-5425-7.
  2. ^ a b Swihart, Samuel J.; Victor Garcia, E.; Stassun, Keivan G.; Gerard van Belle; Mutterspaugh, Matthew W.; Elias, Nicholas (2016). "A Catalog of Calibrator Stars for Next-Generation Optical Interferometers". The Astronomical Journal. 153: 16. arXiv:1610.04600. doi:10.3847/1538-3881/153/1/16.
  3. ^ "Hubble's 'First Light' - NASA Science". science.nasa.gov. Retrieved 2024-07-05.
  4. ^ "Tres-2 - in Kepler Photometer First Light Image - NASA Science". science.nasa.gov. Retrieved 2024-07-05.
  5. ^ "First Light! TESS Shares First Science Image in Hunt to Find New Worlds - NASA Science". science.nasa.gov. Retrieved 2024-07-05.
  6. ^ "Mission Timeline". Webb. Retrieved 2024-07-05.
Quelle: https://en.wikipedia.org/wiki/Calibrator_star