V762 Cassiopeiae is a red supergiant and a variable star located about 2,500 light-years away in the Cassiopeia constellation. Its apparent magnitude vary between 5.82 and 5.95, which makes it faintly visible to the naked eye under dark skies. It is a relatively cool star with an average surface temperature of 3,869 K.
V762 Cassiopeiae has a spectral classification of K0 I,[3] meaning that it is an evolved K-type red supergiant star. It is estimated to be ten million years old, has around 16.9 times the Sun's mass[4] and has expanded to 266 times the Sun's diameter. It radiates 15,000 times the solar luminosity from its photosphere at an effective temperature of 3869 K,[5] which gives it an orange-red hue, typical of red supergiants.[8] Parallax measurements from the Gaia spacecraft show that V762 Cassiopeiae is located 2,480 light-years away.[1] 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.[9] The variability amplitude in visible light is only about 0.1 magnitudes. The International Variable Star Index lists it as an irregular variable,[2] but the General Catalogue of Variable Stars (GCVS) classifies it as a BY Draconis star.[10] The designation of GCVS is likely erroneous, since BY Draconis variability is a characteristic of main sequence stars.[11]
Some websites claim V762 Cassiopeiae is the "farthest star visible to the naked eye", at a distance of 16,308 light-years.[12][13] This is inconsistent with parallax measurements from both Hipparcos, which found a parallax of 1.18±0.45 mas, corresponding to a distance of about 2,800 light-years,[14] and Gaia DR3, which lists a parallax of 1.3148±0.0693 mas, corresponding to a distance of about 2,500 light-years.[1][a] The websites claiming that V762 Cassiopeiae is the "farthest star visible to the naked eye" also do not cite any references for the distance of 16,308 light-years, making the origin of this value uncertain.
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