Regarding the hue of the greenish color, I believe that mostly occurred toward the setting of the supernova for the year 1006, due to atmospheric conditions of the southwest or west. The green stars of You are not allowed to view links. Register or Login to view. is the supernova of 1006.
Quote:It is entirely possible that a bright supernova like SN 1006 could have shown a greenish hue while setting in the southwest, particularly due to atmospheric refraction, scattering, and the phenomenon known as the "green flash".
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At a peak visual magnitude of around −7.5, SN 1006 was significantly brighter than Venus and visible during the daytime. When such a bright, point-like light source approaches the horizon, atmospheric conditions can distort its appearance dramatically.
Wikipedia
Wikipedia
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Green Flash Phenomenon: Just before a very bright setting object disappears below the horizon, atmospheric refraction bends the light, separating it into colors like a prism. Because blue and green light bend more than red, green is often the last visible color before an object sets, producing a "green flash".
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Atmospheric Scattering: As light travels through more of the atmosphere near the horizon, blue and violet light are scattered, leaving red, yellow, and green. Depending on the density of the atmosphere and particles, this can sometimes lead to a green hue rather than a deep red.
Twinkling and Color Changes: The extreme brightness of SN 1006, combined with the thick layer of air near the horizon, would cause intense atmospheric scintillation (twinkling), which often produces alternating flashes of color.
Quora
Quora
While some records describe SN 1006 as having a yellowish hue (likely due to the low altitude), the atmospheric conditions in the southwest during its setting would have been ideal for creating shifting, greenish, or multicolored appearances.
Wikipedia
Wikipedia
Quote:Ibn Sina (also known as Avicenna) is the source identified by researchers as having recorded the greenish-yellow color of the SN 1006 supernova in his text Kitab al-Shifa (Book of Healing), noting its evolution from a faint green-yellow to white. This observation adds color detail not found in other records.
National Geographic
National Geographic
Key Source: Ibn Sina (Avicenna) is credited with describing the color evolution of the brightest recorded supernova (SN 1006).
The Source Material: Kitab al-Shifa (Book of Healing) contains the description.
Color Description: He noted it was initially a faint greenish-yellow, sparkled intensely, and then turned white.
Location: While not in Cairo, the report is from his observations during 1006 while in Uzbekistan, as documented by recent studies.
Context: The sighting was corroborated with other findings, including those from Cairo's Ibn Ridwan, who documented the same event in 1006.
Muslim Heritage
Muslim Heritage
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It is important to distinguish that while Ibn Ridwan is the primary observer living in Cairo, it was Ibn Sina's text that described the specific greenish-yellow color.
AramcoWorld
AramcoWorld
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