Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Cassiopeia |
Right ascension | 01h 16m 11.902s [1] |
Declination | +71° 44′ 37.83″ [1] |
Apparent magnitude (V) | 5.82 – 5.95 [2] |
Characteristics | |
Evolutionary stage | Red supergiant [3] |
Spectral type | K5 I [3] [2] |
Variable type | Slow irregular variable [2] |
Astrometry | |
Radial velocity (Rv) | −21.37±0.91 [1] km/s |
Proper motion (μ) |
RA: -1.658
mas/
yr
[1] Dec.: 1.791 mas/ yr [1] |
Parallax (π) | 1.3148 ± 0.0693 mas [1] |
Distance | 2,500 ± 100
ly (760 ± 40 pc) |
Details | |
Mass | 16.9±2.2 [4] M☉ |
Radius | 265.7 [5] R☉ |
Luminosity | 14,970 [5] L☉ |
Temperature | 3869±145 [3] [5] K |
Age | 10.0±1.6 [4] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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.
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Cassiopeia |
Right ascension | 01h 16m 11.902s [1] |
Declination | +71° 44′ 37.83″ [1] |
Apparent magnitude (V) | 5.82 – 5.95 [2] |
Characteristics | |
Evolutionary stage | Red supergiant [3] |
Spectral type | K5 I [3] [2] |
Variable type | Slow irregular variable [2] |
Astrometry | |
Radial velocity (Rv) | −21.37±0.91 [1] km/s |
Proper motion (μ) |
RA: -1.658
mas/
yr
[1] Dec.: 1.791 mas/ yr [1] |
Parallax (π) | 1.3148 ± 0.0693 mas [1] |
Distance | 2,500 ± 100
ly (760 ± 40 pc) |
Details | |
Mass | 16.9±2.2 [4] M☉ |
Radius | 265.7 [5] R☉ |
Luminosity | 14,970 [5] L☉ |
Temperature | 3869±145 [3] [5] K |
Age | 10.0±1.6 [4] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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.