Epsilon Phoenicis
Star in the constellation Phoenix
From Wikipedia, the free encyclopedia
Epsilon Phoenicis is a star in the southern constellation of Phoenix. It is visible to the naked eye with an apparent visual magnitude of 3.87.[2] The distance to this star is approximately 144 light years based on parallax measurements, but it is drifting closer with a heliocentric radial velocity of −9.2 km/s.[5]
 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Phoenix |
| Right ascension | 00h 09m 24.640s[1] |
| Declination | −45° 44′ 50.73″[1] |
| Apparent magnitude (V) | 3.87[2] |
| Characteristics | |
| Evolutionary stage | Red clump[3] |
| Spectral type | K0III[4] |
| U−B color index | +0.84[2] |
| B−V color index | +1.02[2] |
| Astrometry | |
| Radial velocity (Rv) | −9.20[5] km/s |
| Proper motion (μ) | RA: +120.393 mas/yr[1] Dec.: −179.597 mas/yr[1] |
| Parallax (π) | 22.6081±0.1481 mas[1] |
| Distance | 144.3 ± 0.9 ly (44.2 ± 0.3 pc) |
| Absolute magnitude (MV) | 0.65[6] |
| Details[7] | |
| Mass | 1.93±0.23 M☉ |
| Radius | 10.03±0.22 R☉ |
| Luminosity | 50.4±1.5 L☉ |
| Surface gravity (log g) | 2.560±0.103 cgs |
| Temperature | 4,862±42[8] K |
| Metallicity [Fe/H] | +0.00±0.08[8] dex |
| Rotational velocity (v sin i) | < 1.5[9] km/s |
| Other designations | |
| FK5 3, GC 158, HD 496, HIP 765, HR 25, SAO 214983[10] | |
| Database references | |
| SIMBAD | data |
This is an evolved giant star with a stellar classification of K0III,[4] a star that has used up its core hydrogen and has expanded. It is a red clump star, indicating that it has passed the red-giant branch, undergone a helium flash and is currently on the core helium-fusing horizontal branch.[3] Epsilon Phoenicis is about two times more massive than the Sun, and expanded to ten times its radius. It radiates 50 the luminosity of the Sun from its photosphere[7] at an effective temperature of 4,862 K. Based on the elemental abundance of iron in the stellar atmosphere, the metallicity of Epsilon Phoenicis is similar to that of the Sun.[8]
