Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cassiopeia |
Right ascension | 02h 03m 26.10206s [1] |
Declination | +72° 25′ 16.6376″ [1] |
Apparent magnitude (V) | +3.95 [2] |
Characteristics | |
Evolutionary stage | main sequence [3] |
Spectral type | A2 V [3] |
B−V color index | −0.002±0.007 [2] |
Astrometry | |
Radial velocity (Rv) | −18.2±0.9 [4] km/s |
Proper motion (μ) |
RA: −43.57
[5]
mas/
yr Dec.: +22.30 [5] mas/ yr |
Parallax (π) | 20.76 ± 0.14 mas [5] |
Distance | 157 ± 1
ly (48.2 ± 0.3 pc) |
Absolute magnitude (MV) | 0.54 [2] |
Details | |
Mass | 2.56±0.03 [3] M☉ |
Radius | 2.5 [6] R☉ |
Luminosity | 63.8+3.5 −6.4 [3] L☉ |
Temperature | 9,376+240 −235 [3] K |
Metallicity [Fe/H] | +0.18±0.28 [7] dex |
Rotational velocity (v sin i) | 91 [3] km/s |
Other designations | |
Database references | |
SIMBAD | data |
50 Cassiopeiae is a white star in the northern constellation of Cassiopeia. In the past, it had been misidentified as a suspected nebula, and given the number NGC 771. [9] The star is visible to the naked eye, having an apparent visual magnitude of +3.95. [2] Based upon an annual parallax shift of 20.76 mas, it is located 157 light years away. It is moving closer, having a heliocentric radial velocity of −18 km/s, [4] and will approach to within 82 ly in 1.879 million years. [2]
It is an A-type main-sequence star with a stellar classification of A2 V. [3] It is a suspected variable star with a very small amplitude. [11] 50 Cas has an estimated 2.56 times the mass of the Sun, [3] and about 2.5 times the Sun's radius. [6] It is radiating 64 times the Sun's luminosity from its photosphere at an effective temperature of around 9,376 K. [3]
The star was the brightest star in the occasionally used 1775 to 19th century constellation Custos Messium, typically drawn as a depiction of Charles Messier standing on top of the giraffe ( Camelopardus), between Cepheus and Cassiopeia. [12]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cassiopeia |
Right ascension | 02h 03m 26.10206s [1] |
Declination | +72° 25′ 16.6376″ [1] |
Apparent magnitude (V) | +3.95 [2] |
Characteristics | |
Evolutionary stage | main sequence [3] |
Spectral type | A2 V [3] |
B−V color index | −0.002±0.007 [2] |
Astrometry | |
Radial velocity (Rv) | −18.2±0.9 [4] km/s |
Proper motion (μ) |
RA: −43.57
[5]
mas/
yr Dec.: +22.30 [5] mas/ yr |
Parallax (π) | 20.76 ± 0.14 mas [5] |
Distance | 157 ± 1
ly (48.2 ± 0.3 pc) |
Absolute magnitude (MV) | 0.54 [2] |
Details | |
Mass | 2.56±0.03 [3] M☉ |
Radius | 2.5 [6] R☉ |
Luminosity | 63.8+3.5 −6.4 [3] L☉ |
Temperature | 9,376+240 −235 [3] K |
Metallicity [Fe/H] | +0.18±0.28 [7] dex |
Rotational velocity (v sin i) | 91 [3] km/s |
Other designations | |
Database references | |
SIMBAD | data |
50 Cassiopeiae is a white star in the northern constellation of Cassiopeia. In the past, it had been misidentified as a suspected nebula, and given the number NGC 771. [9] The star is visible to the naked eye, having an apparent visual magnitude of +3.95. [2] Based upon an annual parallax shift of 20.76 mas, it is located 157 light years away. It is moving closer, having a heliocentric radial velocity of −18 km/s, [4] and will approach to within 82 ly in 1.879 million years. [2]
It is an A-type main-sequence star with a stellar classification of A2 V. [3] It is a suspected variable star with a very small amplitude. [11] 50 Cas has an estimated 2.56 times the mass of the Sun, [3] and about 2.5 times the Sun's radius. [6] It is radiating 64 times the Sun's luminosity from its photosphere at an effective temperature of around 9,376 K. [3]
The star was the brightest star in the occasionally used 1775 to 19th century constellation Custos Messium, typically drawn as a depiction of Charles Messier standing on top of the giraffe ( Camelopardus), between Cepheus and Cassiopeia. [12]