42 Cassiopeiae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 01h 42m 55.86328s |
| Declination | +70° 37′ 21.0921″ |
| Apparent magnitude (V) | +5.18 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | B9 V |
| B−V color index | −0.022±0.002 |
| Variable type | suspected β Per |
| Astrometry | |
| Radial velocity (Rv) | +6.6±2.9 km/s |
| Proper motion (μ) | RA: +76.295 mas/yr Dec.: −14.091 mas/yr |
| Parallax (π) | 11.1166±0.0661 mas |
| Distance | 293 ± 2 ly (90.0 ± 0.5 pc) |
| Absolute magnitude (MV) | 0.53 |
| Details | |
| Mass | 2.68±0.04 M☉ |
| Radius | 2.63±0.13 R☉ |
| Luminosity | 66.12 L☉ |
| Surface gravity (log g) | 3.98±0.04 cgs |
| Temperature | 10,141±61 K |
| Rotational velocity (v sin i) | 149 km/s |
| Age | 67+188 −57 Myr |
| Other designations | |
| 42 Cas, NSV 590, BD+69°114, GC 2059, HD 10250, HIP 8016, HR 480, SAO 4470 | |
| Database references | |
| SIMBAD | data |
42 Cassiopeiae is a possible binary star system in the northern circumpolar constellation of Cassiopeia. It is visible to the naked eye as a dim, blue-white hued star with a baseline apparent visual magnitude of +5.18. The system is located approximately 293 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +7 km/s.
This is classified as a suspected eclipsing binary of the Algol type, with a period of 16.77 days and a magnitude decrease of 0.3. The primary is a B-type main-sequence star with a stellar classification of B9V. It is roughly 67 million years old and is spinning with a projected rotational velocity of 149 km/s. The star has 2.7 times the mass of the Sun and 2.6 times the Sun's radius. It is radiating 66 times the luminosity of the Sun from its photosphere at an effective temperature of 10,141 K.