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X/1106 C1, also known as the Great Comet of 1106, was a Great Comet that appeared on February 2, 1106, and was observed across the world from the beginning of February through to mid-March. It was recorded by astronomers in Wales, England, Japan, Korea, China and Europe. It was observed to split in two, and may have formed the Great Comet of 1882, Comet Ikeya–Seki and SOHO-620. It is a member of the Kreutz Group, known as Subfragment I, split from an earlier comet.
A brief note in the Welsh manuscript known as the Brut y Tywysogion reads (in translation):
[-1106]. In that year there was seen a star wonderful to behold, throwing out behind it a beam of light of the thickness of a pillar in size and of exceeding brightness, foreboding what would come to pass in the future: for Henry, emperor of Rome, after mighty victories and a most pious life in Christ, went to his rest. And his son, after winning the seat of the empire of Rome, was made emperor.
The 1106 annal of the Peterborough Chronicle describes the comet. The Dorothy Whitlock translation reads:
In the first week of Lent, on the Friday, 16 February, in the evening, there appeared an unusual star, and for a long time after that it was seen shining a while every evening. This star appeared in the south-west; it seemed small and dark. The ray that shone from it, however, was very bright, and seemed to be like an immense beam shining north-east; and one evening it appeared as if this beam were forking into many rays toward the star from an opposite direction.
- Sigebert of Gembloux mentions it in his Chronicon sive Chronographia (pub. 1111).
- De Significatione Cometarum
- Anales Toledanos I (c. 1219)
- Dainihonshi（大日本史） (1715)
- Wenxian Tongkao（文獻通考） (1308)
- History of Song（宋史） (1345)
- Xu Tongjian Gangmu（續通鑒綱目） (1476)
- Historia Hierosolymitana[disambiguation needed]
- Thomas Jones, Brut y Tywysogion, or, the Chronicle of the Princes: Red Book of Hergest version, University of Wales Press, Cardiff, 1955.
- Comet X/1106 C1: Publication der Sternwarte in Kiel, No. 6, pp. 1–66, and AN 238 (1930 Jun 5), pp. 403–4
- Historic astronomical observations in Wales
- SOHO-620: A Comet on the Right(hand) Track
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