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V762 Cassiopeiae

Red supergiant star in the constellation Cassiopeia From Wikipedia, the free encyclopedia

V762 Cassiopeiae
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V762 Cassiopeiae is a star in the constellation of Cassiopeia. Its apparent magnitude vary between 5.82 and 5.95, which makes it faintly visible to the naked eye under dark skies. Parallax measurements give it a distance of 2,500 light-years.

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Characteristics

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A light curve for V762 Cassiopeiae, plotted from Hipparcos data[11]

V762 Cassiopeiae has a spectral classification of K5 I,[4] suggesting that it is an evolved K-type red supergiant star. Other catalogues have published spectral types of K4,[12] M,[13] and M3II.[6] The Bright Star Catalogue assigned a class of K1V,[14] which originated from one of the earliest observations of this star[15] and was adopted by the General Catalogue of Variable Stars.[14] Recent estimates of the star's physical properties, considering its distance in excess of a thousand light-years,[2] found that it is a red supergiant[4] or asymptotic giant branch star.[5]

At an estimated to be ten million years old, has around 16.9 times the Sun's mass[8] and has expanded to 266 times the Sun's radius. It radiates 15,000 times the solar luminosity from its photosphere at an effective temperature of 3,869 K,[5] which gives it an orange-red hue.[16] Parallax measurements from the Gaia spacecraft show that V762 Cassiopeiae is located about 2,500 light-years away.[2] At the estimated distance, V762 Cassiopeiae's apparent brightness is diminished by 1.04 magnitudes due to interstellar extinction.[5]

Hipparcos satellite data showed that the star is variable, and because of that it was given the variable-star designation V762 Cassiopeiae, in 1999.[17] The variability amplitude in visible light is only about 0.1 magnitudes.[3] The star was catalogued as a semi-regular variable.[7]

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Distance and titleholding

Some websites claim V762 Cassiopeiae is the "farthest star visible to the naked eye", at a distance of 16,300 light-years.[18][19] This distance is apparently based on the first Hipparcos published parallax of 0.22±0.59 mas, approximately 5,000 pc or 16,300 light years. However, given the statistical margin of error, the distance is meaningless. The Hipparcos new reduction gives a parallax of 1.18±0.45 mas, corresponding to a distance of about 2,800 light-years,[20] and Gaia DR3 lists a parallax of 1.3148±0.0693 mas, corresponding to a distance of about 2,500 light-years.[2]

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References

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