Gamma Equulei
 The location of γ Equulei (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Equuleus |
| Right ascension | 21h 10m 20.50005s[1] |
| Declination | 10° 07′ 53.6763″[1] |
| Apparent magnitude (V) | 4.69[2] |
| Characteristics | |
| Spectral type | A9 Sr Eu[3] |
| U−B color index | +0.10[2] |
| B−V color index | +0.26[2] |
| R−I color index | +0.10 |
| Variable type | α2 CVn[4] |
| Astrometry | |
| Radial velocity (Rv) | -16.5 ± 0.3 km/s |
| Proper motion (μ) | RA: 48.74[1] mas/yr Dec.: mas/yr |
| Parallax (π) | 27.55 ± 0.62[1] mas |
| Distance | 118 ± 3 ly (36.3 ± 0.8 pc) |
| Absolute magnitude (MV) | 1.97[citation needed] |
| Details | |
| Radius | 2.20 ± 0.12 R☉ |
| Luminosity | 12.8 ± 1.4 L☉ |
| Surface gravity (log g) | 4.47[5] cgs |
| Temperature | 8,574[5] K |
| Metallicity [Fe/H] | +0.68[5] dex |
| Other designations | |
Gamma Equulei (5 Equulei) is the Bayer designation for a double star[6] in the northern constellation of Equuleus. It is located at a distance of around 118 light-years (36 parsecs) from Earth[1] and has an apparent visual magnitude of 4.7.[2]
The primary component is a chemically peculiar star with a stellar classification of A9 Sr Eu[3] and an apparent magnitude of 4.80.[4] Gamma Equulei undergoes periodic pulsations in luminosity, which places it among the category of roAp stars.[7] The surface magnetic field undergoes long term variation with a period of 91.1 ± 3.6 years, ranging from +577 G to –1,101 G.[8] It has a magnitude 9.05 companion at an angular separation of 1.26 arcseconds.[6]
References
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