Phi Cassiopeiae (φ Cas, φ Cassiopeiae) is a multiple star in the constellation Cassiopeia with a combined apparent magnitude of +4.95. The two brightest components are A and C, sometimes called φ1 and φ2 Cas. φ Cas A is an F0 bright supergiant of magnitude 4.95 and φ Cas C is a 7.08 magnitude B6 supergiant at 134".
Quick Facts Apparent magnitude (V), Characteristics ...
φ Cassiopeiae
Location of φ Cassiopeiae (circled) |
Observation data Epoch J2000.0 Equinox J2000.0 |
Constellation |
Cassiopeia |
A |
Right ascension |
01h 20m 04.916s[1] |
Declination |
+58° 13′ 53.81″[1] |
Apparent magnitude (V) |
+5.11[2] |
C |
Right ascension |
01h 19m 51.736s[3] |
Declination |
+58° 11′ 29.32″[3] |
Apparent magnitude (V) |
+7.08[2] |
Characteristics |
A |
Spectral type |
F0Ia[2] |
U−B color index |
+0.49[4] |
B−V color index |
+0.68[4] |
|
C |
Spectral type |
B6Ib[2] |
U−B color index |
−0.37[4] |
B−V color index |
+0.41[4] |
Astrometry |
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A |
---|
Radial velocity (Rv) | −28.39[5] km/s |
Proper motion (μ) | RA: −1.479[1] mas/yr Dec.: −1.231[1] mas/yr |
Parallax (π) | 0.2142 ± 0.0838 mas[1] |
Distance | approx. 15,000 ly (approx. 5,000 pc) |
Absolute magnitude (MV) | −8.76[6] |
C |
---|
Radial velocity (Rv) | −28.50[7] km/s |
Proper motion (μ) | RA: −1.560[3] mas/yr Dec.: −0.809[3] mas/yr |
Parallax (π) | 0.3679 ± 0.0169 mas[3] |
Distance | 8,900 ± 400 ly (2,700 ± 100 pc) |
Absolute magnitude (MV) | −6.5[8] |
Details |
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A |
---|
Mass | 6.3[9]–17[10] M☉ |
Radius | 263[9] R☉ |
Luminosity | 170,000[9] L☉ |
Surface gravity (log g) | 1.0[6] cgs |
Temperature | 7,341[6] K |
Metallicity | -0.24[6] |
Rotational velocity (v sin i) | 23[11] km/s |
Age | 20[12] Myr |
C |
---|
Mass | 21[8] M☉ |
Radius | 53[8] R☉ |
Luminosity | 83,000[13] L☉ |
Surface gravity (log g) | 2.05[13] cgs |
Temperature | 15,500[13] K |
Rotational velocity (v sin i) | 35[13] km/s |
Other designations |
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|
A: HD 7927, HIP 6242, BD+57°260, SAO 22191, GC 1594 |
C: HD 7902, HIP 6229, BD+57°257, SAO 22187, GC 1590, NSV 466 |
Database references |
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SIMBAD | data |
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