| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 01h 42m 55.86184s[1] |
| Declination | +70° 37′ 21.09002″[1] |
| Apparent magnitude (V) | +5.18[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | B9 V[4] |
| B−Vcolor index | −0.022±0.002[2] |
| Variable type | suspectedβ Per[5] |
| Astrometry | |
| Radial velocity (Rv) | +6.6±2.9[2] km/s |
| Proper motion (μ) | RA: +76.763[1]mas/yr Dec.: −13.955[1]mas/yr |
| Parallax (π) | 11.2028±0.1432 mas[1] |
| Distance | 291 ± 4 ly (89 ± 1 pc) |
| Absolute magnitude (MV) | 0.53[2] |
| Details | |
| Mass | 2.68±0.04[3] M☉ |
| Radius | 2.63±0.13[6] R☉ |
| Luminosity | 66.12[2] 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 |
42 Cassiopeiae is a possiblebinary star[9] system in the northerncircumpolar constellation ofCassiopeia. It is visible to the naked eye as a dim, blue-white hued star with a baselineapparent visual magnitude of +5.18. The system is located approximately 291 light years from the Sun based onparallax,[1] and is drifting further away with aradial velocity of +7 km/s.[2]
This is classified as a suspectedeclipsing binary of theAlgol type,[5] with a period of 16.77 days and a magnitude decrease of 0.3.[10] The primary is aB-type main-sequence star with astellar classification of B9V.[4] It is roughly 67[7] million years old and is spinning with aprojected rotational velocity of 149 km/s.[3] The star has 2.7[3] times themass of the Sun and 2.6[6] times theSun's radius. It is radiating 66[2] times theluminosity of the Sun from itsphotosphere at aneffective temperature of 10,141 K.[6]
