Hot pixel (telescopes)

The simulated image with stars and other sources (legend: No. 1 — hot pixel, No. 2 — bad column, No. 3 — cosmics, No. 4 — star).

A hot pixel or bright dot defect is a pixel that outputs many more electrons than others at the same input signal in a charge-coupled device (CCD) or CMOS sensor. In the simulated image,[1] the hot pixels are the sources of the salt-and-pepper noise. In the definition of the HST ACS, A pixel above 0.14 e¯/pixel/second is considered a "hot" pixel.[2]

A warm pixel is a pixel that has negative bias values. In the definition of the Hubble Space Telescope, a pixel below the hot pixels range but above 0.06 e¯/pixel/second is considered a "warm" pixel. [2]

## See also

* Defective pixel

## References

1. ↑ Hroch, Filip (2000-02-23). "The robust detection of stars on CCD images". Experimental Astronomy 9 (4): 251–259. doi:10.1023/A:1008195518637.
2. ↑ 2.0 2.1 "4.3 Dark Current, Hot Pixels, and Cosmic Rays - HST User Documentation". https://hst-docs.stsci.edu/acsdhb/chapter-4-acs-data-processing-considerations/4-3-dark-current-hot-pixels-and-cosmic-rays.

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