page_title: Artifact (error)
hierarchical_section_title: Artifact (error)
caption_attribution_description: English: This Hubble Space Telescope image shows Sirius A, the brightest star in our nighttime sky, along with its faint, tiny stellar companion, Sirius B. Astronomers overexposed the image of Sirius A [at centre] so that the dim Sirius B [tiny dot at lower left] could be seen. The cross-shaped diffraction spikes and concentric rings around A*, and the small ring around Sirius B, are artifacts produced within the telescope's imaging system. The two stars revolve around each other every 50 years. Sirius A, only 8.6 light-years from Earth, is the fifth closest star system known. The image was taken with Hubble's Wide Field Planetary Camera 2.
context_page_description: In natural science and signal processing, an artifact or artefact is any error in the perception or representation of any information, introduced by the involved equipment or technique.
context_section_description: In natural science and signal processing, an artifact or artefact is any error in the perception or representation of any information, introduced by the involved equipment or technique(s).
caption: Diffraction spikes are lens flare artifacts
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