42 Cassiopeiae
Star in the constellation Cassiopeia
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42 Cassiopeiae is a possible binary star[9] 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.
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Cassiopeia[1] |
| Right ascension | 01h 42m 55.86328s[2] |
| Declination | +70° 37′ 21.0921″[2] |
| Apparent magnitude (V) | +5.18[1] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | B9 V[4] |
| B−V color index | −0.022±0.002[1] |
| Variable type | suspected β Per[5] |
| Astrometry | |
| Radial velocity (Rv) | +6.6±2.9[1] km/s |
| Proper motion (μ) | RA: +76.295[2] mas/yr Dec.: −14.091[2] mas/yr |
| Parallax (π) | 11.1166±0.0661 mas[2] |
| Distance | 293 ± 2 ly (90.0 ± 0.5 pc) |
| Absolute magnitude (MV) | 0.53[1] |
| Details | |
| Mass | 2.68±0.04[3] M☉ |
| Radius | 2.63±0.13[6] R☉ |
| Luminosity | 66.12[1] L☉ |
| Surface gravity (log g) | 3.98±0.04[6] cgs |
| Temperature | 10,141±61[6] K |
| Rotational velocity (v sin i) | 149[3] km/s |
| Age | 67+188 −57[7] Myr |
| Other designations | |
| 42 Cas, NSV 590, BD+69°114, GC 2059, HD 10250, HIP 8016, HR 480, SAO 4470[8] | |
| Database references | |
| SIMBAD | data |
This is classified as a suspected eclipsing binary of the Algol type,[5] with a period of 16.77 days and a magnitude decrease of 0.3.[10] The primary is a B-type main-sequence star with a stellar classification of B9V.[4] It is roughly 67[7] million years old and is spinning with a projected rotational velocity of 149 km/s.[3] The star has 2.7[3] times the mass of the Sun and 2.6[6] times the Sun's radius. It is radiating 66[1] times the luminosity of the Sun from its photosphere at an effective temperature of 10,141 K.[6]