14 Comae Berenices
14 Comae Berenices is a single star in the northern constellation of Coma Berenices, and is the second brightest member of the Coma Star Cluster. It is a faint star but visible to the naked eye with an apparent visual magnitude of 4.95. Parallax measurements place the star at a distance of about 266 light years.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Coma Berenices |
| Right ascension | 12h 26m 24.06461s |
| Declination | +27° 16′ 05.6845″ |
| Apparent magnitude (V) | 4.95 |
| Characteristics | |
| Spectral type | F0p |
| U−B color index | +0.18 |
| B−V color index | +0.277±0.018 |
| Astrometry | |
| Radial velocity (Rv) | −2.20 km/s |
| Proper motion (μ) | RA: −16.010 mas/yr Dec.: −13.412 mas/yr |
| Parallax (π) | 12.2564 ± 0.2329 mas |
| Distance | 266 ± 5 ly (82 ± 2 pc) |
| Absolute magnitude (MV) | +0.35 |
| Details | |
| Mass | 2.4 M☉ |
| Radius | 23 R☉ |
| Luminosity | 76.01 L☉ |
| Surface gravity (log g) | 3.4 cgs |
| Temperature | 7,300 K |
| Rotational velocity (v sin i) | 226 km/s |
| Age | 500 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The spectrum of this star is peculiar and it has been assigned a number of different stellar classifications: A5, F0p, F0 III Sr, F0 vp, F1 IV: np Sr shell, A9 IV np Sr II, F1 IV, and A9 V + shell. Abt & Morrell (1995) designated this a Lambda Boötis star but this was later refuted. No surface magnetic field has been detected on 14 Comae Bernices.
14 Comae Berenices is a well-known shell star with a high rate of spin, showing a projected rotational velocity of 226 km/s. This is giving the star an oblate shape with an equatorial bulge that is 12% larger than the polar radius. It is radiating 76 times the Sun's luminosity from its photosphere at an effective temperature of 7,300 K.