48 Persei
 Location of 48 Persei (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Perseus |
| Right ascension | 04h 08m 39.69216s |
| Declination | 47° 42′ 45.0429″ |
| Apparent magnitude (V) | 4.03 |
| Characteristics | |
| Spectral type | B3Ve |
| U−B color index | -0.55 |
| B−V color index | -0.03 |
| Variable type | γ Cas |
| Astrometry | |
| Radial velocity (Rv) | +0.80 km/s |
| Proper motion (μ) |
RA: +21.73 mas/yr Dec.: -33.61 mas/yr |
| Parallax (π) | 6.84 ± 0.16mas |
| Distance | 480 ± 10 ly (146 ± 3 pc) |
| Absolute magnitude (MV) | -1.86 |
| Details | |
| Mass | 7.5 M☉ |
| Luminosity | 600 L☉ |
| Surface gravity (log g) | 3.86 cgs |
| Temperature | 17,490 K |
| Metallicity [Fe/H] | -0.04 dex |
| Rotational velocity (v sin i) | 197 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
48 Persei (also known as c Persei, 48 Per, HR 1273, HIP 19343, or HD 25940) is a Be star in the constellation Perseus, approximately the 500th brightest of the visible stars in apparent magnitude. It is "well known for its complex spectrum and for its light and velocity variations". The name "48 Persei" is a Flamsteed designation given to it by John Flamsteed in his catalogue, published in 1712.
As a Be star, it is hot and blue, spinning so rapidly that it forms an unstable equatorial disk of matter surrounding it. Its mass has been estimated as seven times that of the Sun, and its estimated age of 40 million years makes it much younger than the Sun. In another few million years it will likely cease hydrogen fusion, expand, and brighten as it becomes a red giant.
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