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The trio measured the angular diameter of Betelgeuse at 0.047″, a figure that resulted in a diameter of 3.84 × 10 8 km (2.58 AU) based on the parallax value of 0.018″. [37] But limb darkening and measurement errors resulted in uncertainty about the accuracy of these measurements.
A variable yellow hypergiant whose size varied from around 680 R ☉ in 1950–1970 to 910 R ☉ in 1977, and later decreased to 390 R ☉ in the 1990s. [75] V382 Carinae (x Carinae) 485 ± 56 [76] L/T eff: A yellow hypergiant, one of the rarest types of stars. V838 Monocerotis: 464 [77] L/T eff
An asteroid will briefly eclipse Betelgeuse, a bright star in the Orion constellation, causing it to disappear from view for those in a narrow strip of the globe. ... (80 kilometers) by 34 miles ...
It was used to make the first-ever measurement of a stellar diameter, by Michelson and Francis G. Pease, when the diameter of Betelgeuse was measured in December 1920. The diameter was found to be 240 million miles (~380 million kilometers), about the size of the orbit of Mars, or about 300 times larger than the Sun.
In addition to new measurements of the star’s size and distance, this new study from Australian National University (ANU) suggests the star is not likely to erupt for 100,000 years. Betelgeuse ...
To help compare different orders of magnitude, this section lists lengths starting at 10 8 meters (100 megameters or 100,000 kilometers or 62,150 miles). 102 Mm – diameter of HD 149026 b, an unusually dense Jovian planet; 115 Mm – width of Saturn's Rings; 120 Mm – diameter of EBLM J0555-57Ab, the smallest-known star; 120 Mm – diameter ...
a What is the actual diameter of Betelgeuse ? In the article 1e12 metres I see: 1200 million km; but the Betelgeuse article mentions this: 290 million km -- 1.9 AU -- Minimum diameter of Betelgeuse 480 million km -- 3.2 AU -- Maximum diameter of Betelgeuse. and these numbers are also copied in 1e11 metres.
The result was a measured radius of 696,342 ± 65 kilometres (432,687 ± 40 miles). [4] Haberreiter, Schmutz & Kosovichev (2008) [1] determined the radius corresponding to the solar photosphere to be 695,660 ± 140 kilometres (432,263 ± 87 miles). This new value is consistent with helioseismic estimates; the same study showed that previous ...