Iota Delphini
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Delphinus |
| Right ascension | 20h 37m 49.1198s |
| Declination | +11° 22′ 39.631″ |
| Apparent magnitude (V) | 5.42±0.01 |
| Characteristics | |
| Spectral type | A1 IV |
| U−B color index | +0.03 |
| B−V color index | +0.03 |
| Astrometry | |
| Radial velocity (Rv) | −3.9±0.9 km/s |
| Proper motion (μ) | RA: +38.867 mas/yr Dec.: −8.609 mas/yr |
| Parallax (π) | 16.6478±0.0728 mas |
| Distance | 195.9 ± 0.9 ly (60.1 ± 0.3 pc) |
| Absolute magnitude (MV) | 1.62 |
| Orbit | |
| Period (P) | 11.039 days |
| Eccentricity (e) | 0.23 |
| Periastron epoch (T) | 2422139.862 |
| Argument of periastron (ω) (secondary) | 61.8° |
| Semi-amplitude (K1) (primary) | 26.0 km/s |
| Details | |
| Mass | 2.47 M☉ |
| Radius | 1.9 R☉ |
| Luminosity | 23 L☉ |
| Surface gravity (log g) | 4.29 cgs |
| Temperature | 9,130 K |
| Metallicity [Fe/H] | −0.25 dex |
| Rotational velocity (v sin i) | 28 km/s |
| Age | 225 Myr |
| Other designations | |
| ι Del, 5 Delphini, BD+10°4339, GC 28711, HD 196544, HIP 101800, HR 7883, SAO 106322 | |
| Database references | |
| SIMBAD | data |
Iota Delphini (ι Del, ι Delphini) is a star in the constellation Delphinus. It has an apparent magnitude of about 5.4, meaning that it is just barely visible to the naked eye. Based upon parallax measurements made by the Gaia spacecraft, this star is located at a distance of 196 light years.
Iota Delphini's spectral type is A1IV, meaning it is an A-type subgiant. Observations of the star's spectrum reveal a periodic Doppler shift. This means that Iota Delphini is a spectroscopic binary with a period of 11 days and an eccentricity of 0.23. However, almost no information is known about the companion star.
Iota Delphini appears to be an Am star, also known as a metallic-line star. These types of stars have spectra indicating varying amounts of metals, like iron. Observations of Iota Delphini's spectrum have shown lower amounts of calcium and higher amounts of iron than usual.