1 Cassiopeiae is a single[10] star in the northern constellation of Cassiopeia, located around 1,130 light years from the Sun.[1] It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of +4.84.[2] This object is moving closer to the Earth with a heliocentric radial velocity of −9 km/s.[2]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Cassiopeia |
Right ascension | 23h 06m 36.818s[1] |
Declination | +59° 25′ 11.14″[1] |
Apparent magnitude (V) | +4.84[2] |
Characteristics | |
Spectral type | B0.5 III[3] |
U−B color index | −0.87 |
B−V color index | −0.060±0.004[2] |
Astrometry | |
Radial velocity (Rv) | −9.1±0.9[2] km/s |
Proper motion (μ) | RA: 6.94±0.14[1] mas/yr Dec.: −1.95±0.14[1] mas/yr |
Parallax (π) | 2.89 ± 0.13 mas[1] |
Distance | 1,130 ± 50 ly (350 ± 20 pc) |
Absolute magnitude (MV) | −2.91[2] |
Details | |
Mass | 13.1[4] M☉ |
Radius | 10.2[5] R☉ |
Luminosity | 18,200[4] L☉ |
Surface gravity (log g) | 3.98[4] cgs |
Temperature | 27,200[4] K |
Metallicity [Fe/H] | −0.40[6] dex |
Rotational velocity (v sin i) | 31[7] km/s |
Age | 5.7±0.1[8] Myr |
Other designations | |
Database references | |
SIMBAD | data |
The stellar classification of 1 Cassiopeiae is B0.5 III,[3] matching an evolved B-type giant star. It is 5.7[8] million years old with a projected rotational velocity of 31.[7] The star has 13.1[4] times the mass of the Sun and 10.2[5] times the Sun's radius. It is radiating 18,200[4] times the Sun's luminosity from its photosphere at an effective temperature of 27,200 K.[4]