Iota Phoenicis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Phoenix |
| Right ascension | 23h 35m 04.57082s |
| Declination | −42° 36′ 54.5409″ |
| Apparent magnitude (V) | 4.71 (4.70 - 4.75) |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A2VpSrCrEu |
| U−B color index | +0.07 |
| B−V color index | +0.08 |
| Variable type | α2 CVn |
| Astrometry | |
| Radial velocity (Rv) | +19.4 km/s |
| Proper motion (μ) | RA: +39.908 mas/yr Dec.: + 10.844 mas/yr |
| Parallax (π) | 12.8425±0.3922 mas |
| Distance | 254 ± 8 ly (78 ± 2 pc) |
| Absolute magnitude (MV) | 0.28 |
| Details | |
| Mass | 2.23 M☉ |
| Radius | 5.07+0.51 −0.42 R☉ |
| Luminosity | 68.2±3.3 L☉ |
| Surface gravity (log g) | 3.89 cgs |
| Temperature | 7,370+320 −350 K |
| Metallicity [Fe/H] | -0.01 dex |
| Rotational velocity (v sin i) | 23 km/s |
| Age | 573 Myr |
| Other designations | |
| ι Phe, CD−43°15420, FK5 1617, HD 221760, HIP 116389, HR 8949, SAO 231675, CCDM J23351-4237A, WDS J23351-4237A | |
| Database references | |
| SIMBAD | data |
ι Phoenicis, Latinized as Iota Phoenicis, is a binary star system in the southern constellation of Phoenix, near the constellation border with Grus. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude that fluctuates around 4.71. This system lies approximately 254 light years from the Sun based on parallax, and it is drifting further away with a radial velocity of +19.4 km/s.
The primary component is an Ap star on the main sequence with a stellar classification of A2VpSrCrEu, where the suffix notation indicates abnormal abundances of strontium, chromium, and europium in the stellar atmosphere. It is an Alpha2 Canum Venaticorum variable; its apparent magnitude varies from 4.70 down to 4.75 with a period of 12.5 days. A rotationally-modulated magnetic field has been measured, varying from −72±9 G to 57±9 G. It has an estimated rotation period of 5.98±0.06 d, although this is in need of further confirmation.
The proper motion companion is a magnitude 12.8 star at an angular separation of 6.7″.